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Storm Water Drainage Study College Station ISO -High School College Station , Texas
2 February 25, 2010 Mr. Alan Gibbs, P.E., City Engineer City of College Station Planning Services 1101 Texas Avenue College Station, TX 77842 Re: Storm Water Drainage Study College Station
ISO High School College Station, Texas Gessner Engineering Job No.: 09-0318 , Dear Mr. Gibbs: This report conveys the results of the storm water drainage study conducted by Gessner Engineering
for the proposed College Station ISO High School in College Station, Texas. Gessner Engineering believes that all information contained in this report is valid. Please contact us if
you have any questions or if we can be of further assistance. ... Sincerely, GESSNER ENGINEERING, LLP F-7451 -Melissa P. Thomas, P.E. -'"""''-'_--;€. OF 7'"~\,\ ;-<..~ ........ "--I:
'. ;'OJ •• ' *··...,cP.,: */", * ~ i(*. '*~ ~ ....................... ~ ~ MEl.ISSA P. THOMAS I ~ • ...................... if! ~.-o'" 9839B .:<;t:!'t~.~/~CENS~<;V~I',_ «'So'··, .... ~~.:
\\,o/ONAL ~~__-"""....-G Gessner Engineering 1712 Southwest Pkwy Suite 105 Station, Texas Texas 77840 P.O. Box 10763,77842-0763 979.680.8840 FA.X 979.680.8841 2104 S. Chappell Hill Sf.
Brenham, Texas 77833 N:\Gessner Eng Data 09\09-0318 CSISD Highlcivil\DoclDrainage Report-NRCS-high.doc 979.836.685') FAX 979.836.6847
3 Executive Summary This storm water drainage report is submitted to the City of College Station, Texas for review on February 25,2010 by Melissa P. Thomas, P.E. of Gessner Engineering,
located at 2501 Ashford Drive, Suite 102, College Station, Texas 77840. This report is submitted on behalf of the owner, Mr. Jon Hall with College Station Independent School District,
at 1812 Welsh Avenue, Suite 120, College Station, Texas 77840. The proposed project consists of the development of an approximately 64 acre undeveloped site. Proposed improvements include
an approximately 190,400 square foot high school building with football stadium, baseball fields, tennis courts, track and associated field buildings and parking. The site is located
at the south corner of the intersection of Barron Road and Victoria Avenue in College Station, Texas. It is located in the Spring Creek watershed. The site is not located in the FEMA
100 year flood plain, as shown by FIRM number 48041C0205D. Currently, the property is covered in light woods, scattered trees and moderate grass and weeds. None of the surrounding areas
drain through the subject property. The proposed site development routes flow off of the proposed parking, field and building areas into two (2) proposed detention ponds through a storm
network. These ponds will outflow into the Spring Creek Tributary that borders the subject property to the southeast. Due to the size of development at this site, a Notice of Intent
is required for submittal to the Texas Commission on Environmental Quality. In addition, a Storm Water Pollution Prevention Plan has been prepared by Pepper Lawson.' This drainage report
includes a report detailing the methods of calcuations and results summary, with appendices including drainage area maps and calculations, StormNET reports, and Technical Design Summary.
N:IGessner Eng Data 09109-0318 CSISD Highlcivil\DoclDrainage Report-NRCS-high,doc G--------------------------------Gessner Engineering
4 Introduction This storm water drainage report is intended to determine the required detention to match pre-existing storm runoff conditions for the Proposed College Station ISO High
School. Surrounding areas do not drain onto the subject property. Drainage Calculations for this site were prepared according to the National Resource Conservation Method as detailed
in Technical Release 55 (TR-55) published in June of 1986. Proposed improvements include an approximately 190,400 square foot high school with football stadium, baseball fields, tennis
courts, track and associated field buildings and parking. Curve numbers from TR-55 were used based on developed uses as described above. Pre-developed flows were calculated based on
the undeveloped land on the subject tract. The calculated pre-developed and developed flows include the two (2), ten (10), twenty-five (25), fifty (50) and one-hundred (100) year storms
in accordance with the Bryan College Station Unified Stormwater Design Guidelines. Calculations Calculations were performed according to the USDA TR-55 and with the aid of StormNET 4.18.2
by Boss International, Inc. of Madison, Wisconsin. The output data from StormNET has been provided as Appendix C. Time of Concentration The time of concentration (travel time) for each
drainage area was estimated by summing the flow time for each segment of travel. For sheet flow, travel time was estimated by Manning's Kinematic equation: 0.007 x (nL )08 t =--------'.:::='-(
S04.,JP; Where: tt = travel time (hours) n = manning's roughness coefficient L = flow length (feet) S = slope (ftlft) P2 = 2-year, 24 hour rainfall (inches) For shallow concentrated
flow, the travel time was calculated from the flow velocity based on the slope in the direction of flow. These velocities were taken from Table C-4 of the Bryan College Station Unified
Stormwater Design Guidelines. The computed times of concentration for each drainage area are included on sheet C4.0. Computed values were increased to a minimum time of ten (10) minutes
as required. N:\Gessner Eng Data 09\09-0318 CSISD High\Civil\Doc\Drainage Report-NRCS-high.doc G Gessner Engineering
5 Unit Hydrograph A generic unit hydrograph was computed by distributing the rainfall depths (Table One) according to the distribution factors for the NCRS Type III 24 hour storm. This
hydrograph was then applied to each subarea based on the curve number and time of concentration of that area. Reach Routing Hydrographs were routed from subareas to the outflow through
the kinematic wave method. This method allows for hydrographs to be translated with time but not attenuated. The effects of backwater flow and pressure flow in channels were neglected.
Peak Runoff Flow Peak Runoff Flow from the site was determined based on the Type III 24 hour storm applied to each drainage area. The depth-duration-intervals for each frequency are
included in Table One below, and were obtained from Table C-6 in the Unified Stormwater Design Guidelines. Curve Number values (CN) were determined from Table C-7, Appendix C of the
Unified Stormwater Design Guidelines. Peak pre-developed flow for the subject site and adjacent properties is also included in Table One. Drainage areas and calculations are included
on sheet C4.0, which is attached as Appendix A. I Frequency Rainfall Depth (in), 24-hr duration Pre-Developed Peak .......... Flow (cfs) 2 years 4.50 62.4 10 years 7.40 133.5 25 years
8.40 159.0 50 years 9.80 194.5 100 years 11.00 224.6 Table One: Ramfall Depths and Resultmg Flows Inlets The storm design utilizes area grate inlets and curb inlets with grates manufactured
by ADS (or approved equivalent). The inlet capacities were determined based on curves provided by the manufacturer. Storm Pipe Calculations The proposed storm system was sized for the
25 year storm inflow for site runoff. Capacity was calculated based on Manning's equation with a roughness coefficient un" of 0.012 for HOPE pipe. Pond Design The proposed ponds shown
on the grading sheets of the College Station ISO High School Engineering plans were designed to detain the post-developed flows to pre-developed levels. Pond 1 is located on the north
side of the southeast end of the property and detains runoff from the main building and from the parking and fields on the northeast side of the N:\Gessner Eng Data 09109-0318 CSISD
HighlcivillDoclDrainage Report-"IRCS-high.doc G--------------------------------Gessner Engineering 7
6 property. The storage in the designed Pond 1 is shown in Table Two below, Stage Storage Data Pond 1, and in Figure 1, Stage Storage Curve Pond 1. Pond 2 is located on the south side
of the southeast end of the property and detains runoff from the parking and fields on the southwest side of the property. The storage in the designed Pond 2 is shown in Table Three
below, Stage Storage Data Pond 2, and in Figure 2, Stage Storage Curve Pond 2. The storage volumes are computed based on a trapezoidal estimate from the areas given at each elevation
and are reduced by 10% to allow for sedimentation as required. Elevation (ttl Area (sf) Storage (ef) 295 12,099 0 296 33,686 22,892 297 38,373 58,922 298 42,943 99580 299 47,687 144,895
299.5 49,714 169,245 Table Two: Stage Storage Data, Pond 1 Elevation (tt) Area (sf) Storage (ef) 299 4,776 0 300 38,135 21,456 301 69,232 75,139 302 104,531 162,020 303 152,899 290,780
304 255,637 495,003 304.5 3Q1933 634,396 Table Three: Stage Storage Data, Pond 2 N:\Gessner Eng Data 09\09-0318 CS1SD High\civil\Doc\Drainage Report-NRCS-high,doc G --------------------------GessnerE
ngineering
7 4.5 40 3.5 30 @;25 .c E. Q) a 2.0 1.5 1.0 0.5 0.0 Pond 1 Storage Curve ... Depth vs. Volume Curve Volume (tf~) 20K 40K SOK 80K 100K 120K 140K 180K Figure One: Stage Storage Curve,
Pond 1 • [)epIh vs. Volume CUrve Volume (f!') lOOK 200K 500K SOOK 05 0.0 5.5 5.0 4.5 4.0 3.6 2.0 15 1.0 Figure Two: Stage Storage Curve, Pond 2 Outlet Design It was determined that a
staged outlet structure was required for each pond to keep the post developed flows below the pre-developed flows for the 2, 10, 25, 50 and 100 year storms. Details of the outlet structures
are shown on sheets C501 and C505. Table Four below shows post-developed peak flow rates and the maximum water surface elevations in the ponds for each storm event. Using the proposed
outlet structure, it was determined that Pond 1 will have 2.6 feet of freeboard during the 25 year design storm and 2.2 feet of freeboard for the 100 year storm, with a top of berm elevation
of 299.5. Pond 2 will have 2.3 feet of freeboard during the 25 year design storm and 1.8 feet of freeboard for the 100 year storm, with a top of berm elevation of 304.5. Storm Event
Pond1 Water Pond2 Water Surface Surface Elevation Elevation (ft), Postft), Post-Develo ed Develo ed 296.1 301.1 296.8 302.0 296.9 302.2 297.2 302.5 297.3 302.7 Table Four: Pond Outflows
and W.S.E.Ls N:\Gessner Eng Data 09\09-0318 CS[SD High\civil\Doc\Drainage Report-NRCS-high.doc G Gessner Engineering
8 The peak post-developed flow out of the site equals the sum of the hydrographs from Pond One, Pond Two and the flow from some landscaped areas to the east and west. These post-developed
peak flows compared to the pre-developed peak flows are shown in Table Five below for each storm event. Hydrographs for each storm event are included as Appendix B. Post-Developed flows
without onsite detention are also included in the table for reference. Storm Event Pre-Developed Peak Flow (cfs) Post-Developed Flow no Detention (cfs) Post-Developed Flow with Detention
(cfs) 2 year 62.4 102.0 61.5 10 year 133.5 189.2 128.1 25 year 159.0 219.9 152.3 50 year 194.5 258.2 179.8 100 year 224.6 278.7 199.2 Table Five: Pre-Developed and Post-Developed Site
Outflows To dissipate energy at the pond outflow structures, rip rap was designed at each structure based on the discharge velocities. The discharge velocity for the 100 year design
storm is 6.7 feet per second at Pond 1 and 9.0 feet per second at Pond 2. Conclusion Based on visual evidence, engineering drainage calculations and sound engineering judgment, Gessner
Engineering believes that the post-development flows can be detained below or at the pre-developed flows for the two (2), ten (10), twenty-five (25), fifty (50) and one hundred (100)
year design storms for this site. N:\Gessner Eng Data 09\09·0318 CSISD High\civil\Doc\Drainage Report-NRCS-high.doc G--------------------------------Gessner Engineering
9 APPENDIX A: Drainage Area Map and Calculations (Sheet C400) N\Gessner Eng Data 09\09-0318 CS1SD High\civiI\Doc\Drainage Report-NRCS-high.doc G Gessner Engineering
10 APPENDIX B: Hydrographs N:\Gessner Eng Data 09\09-0318 CS1SD High\civi1\Doc\Drainage Report-NRCS-high,doc G Gessner Engineering
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11 APPENDIX C: StormNET Calculations N:\Gessner Eng Data 09\09-0318 CSISD High\civiJ\Doc\Drainage Repon-NRCS-high.doc G Gessner Engineering
BOSS International StormNET® -Version 4.18.2 (Bui1d 17854) ****~*********** Analysis Options **************** F10\y units •••••••••••••••• cfs Subbasin Hydrograph .fethod. SCS TR-55
Time of concentration•••••• SCS TR-55 Link Routing Method ..••••. Kinematic Wave pond Exfi1tration•....••••• None Starting Date •.•••.•••••.. SEP-21-2009 00:00:00 Ending Date .•.••••.••••••.
SEP-22-2009 00:00:00 Report Time Step •••••••••. 00:05:00 Element Count ************* Number of rain gages .•••.. 1 Number of subbasins •.••••• 71 Number of nodes •••.••••••• 98 Number
of 1inks .•••••••••• 99 **************** Raingage Summary **************** Gage Data Data Interval ID Source Type hours Gage-l TS-lOO CU.1ULATIVE 0.10 *~*************~ SUbbasin Swrwu;y
**********T***** Subbasin Total Area ID acres 01 4.78 02 0.58 03 0.47 04 0.44 OS 0.23 06 0.72 07 0.69 08 0.34 09 0.37 10 l.01 11 0.69 12 0.91 13 1. 70 14 0.30 15 0.76 16 0.93 17 0.83
18 .. 0.•.56 __. ...... ..... . ................. __..._. 19 1.18 20 0.63 21 0.64 22 0.74 23 0.84 24 0.72 25 0.61 26 0.47 27 1.10 28 1.60 StormNET Page 1
29 0.97 30 3.52 31 0.76 32 0.44 33 0.24 34 0.67 35 0.41 36 0.92 37 0.25 38 0.41 39 0.34 40 0.64 41 0.70 42 0.84 43 O.BB 44 1.25 45 0.11 46 B.86 47 0.26 4B 0.11 49 0.10 50 0.17 51 0.29
52 0.24 53 0.08 54 0.37 55 0.44 56 57 0.42 0.67 Ii 58 0.13 59 3.27 I!lr 60 0.67 ;>,61 0.27 ~,. 62 0.22 63 1.63 64 0.39 65 0.69 66 0.07 67 0.38 68 0.09 69 4.91 70 0.82 71 0.53 ************
Node Summary ************ Node Element Invert Maxinlum Ponded External ID Type Elevation Elev. Area Inflow ft ft ft' JE1 JUNCTION 306.06 309.06 0.00 JBlO JUNCTION 299.72 303.22 0.00
JEll JUNCTION 295.65 299.65 0.00 JB12 JUNCTION 295.09 299.09 0.00 Jil13 JUNCTION 298.52 299.77 0.00 Jil14 JUNCTION 297.98 299.23 0.00 JBl5 JUNCTION 301.05 302.55 0.00 JBl6 JUNCTION 298.95
301.45 0.00 Jill? ,JUNCT,IQN"" , ,-""" ,,,298,,,16,,,---,,30().66,,,-,,, 0,00,,-, JB1B JUNCTION 295.24 298.24 0.00 JE2 JUNCTION 305.78 308.78 0.00 JB20 JUNCTION 298.72 301. 22 0.00 JB21
JUNCTION 296.42 299.42 0.00 JB22 JUNCTION 295.47 298.47 0.00 JB3 JUNCTION 308.99 310.98 0.00 JB4 JUNCTION 300.77 304.27 0.00 JB5 ' JUNCTION 302.57 306.07 0.00 JB6 JUNCTION 301. 47 304.97
0 . 00 JB7 JUNC'I'ION 301.94 304.44 0.00 StormNET Page 2
JB8 JUNCTION 301. 43 303.93 0.00 JB9 JUNCTION 302.59 304.59 0.00 Jun-l00 JUNCTION 305.86 301.36 0.00 Jun-l01 JUNCTION 305.20 307.70 0.00 Jun-l02 JUNCTION 302.65 304.15 0.00 Jun-103 JUNCTION
302.22 304.22 0.00 Jun-l04 JUNCTION 302.82 304.32 0.00 Jun-l05 JUNCTION 302.09 304.59 0.00 Jun-106 JUNCTION 303.25 305.15 0.00 Jun-l08 JUNCTION 303.66 305.66 0.00 Jun-109 JUNCTION 305.41
307.41 0.00 Jun-110 JUNCTlON 307.22 3013.72 0.00 Jun-l11 JUNCTION 302.13 303.63 0.00 Jun-112 JUNCTION 301. 78 303.78 0.00 Jun-113 JUNCTION 300.94 303.94 0.00 Jun-114 JUNCTION 301. 77
303.77 0.00 Jun-115 JUNCTION 303.31 304.81 0.00 Jun-116 JUNCTION 302.99 304.14 0.00 Jun-117 JUNCTION 303.64 304.89 0.00 Jun-118 JUNCTION 300.62 303.62 0.00 Jun-119 JUNCTION 298.85 302.85
0.00 Jun-120 JUNCTION 297.64 301.64 0.00 Jun-121 JUNCTION 295.87 297.12 0.00 Jun-122 JUNCTION 296.27 297.27 0.00 Jun-123 JUNCTION 297.37 298.87 0.00 Jun-124 JUNCTION 296.91 298.41 0.00
Jun-125 JUNCTION 296.43 297.93 0.00 Jun-126 JUNCTION 295.91 291.91 0.00 Jun-127 JUNCTION 298.14 299.14 0.00 Jun-129 JUNCTION 299.40 300.40 0.00 Jun-129 JUNCTION 299.03 300.03 0.00 Jun-130
JUNCTION 293.48 291.98 0.00 Jur.-131 JUNCTION 294.69 297.69 0.00 Jun-132 JUNCTION 299.17 302.67 0.00 Jun-134 JUNCrrION 301. 98 303.23 0.00 Jun-137 JUNCTION 299.09 300.09 0.00 Jun-139
JUNCTION 296.67 299.17 0.00 Jun-140 JUNCTION 298.50 303.50 0.00 Jun-141 JUNCTION 292.50 297.50 0.00 Jun-62 JUNCTION 314.09 315.09 0.00 Jun-63 JUNCTION 313.71 314.96 0.00 Jun-64 JUNCTION
312.65 314.15 0.00 Jun-65 JUNCTION 311.58 313.58 0.00 Jun-66 JUNCTION 310.34 312.34 0.00 Jun-61 JUNCTION 309.81 311. 87 0.00 Jun-68 JUNCTlON 308.64 311.14 0.00 Jun-69 JUNCTION 309.37
310.31 0.00 Jun-10 JUNCTION 307.44 309.94 0.00 Jun-72 JUNCTION 306.11 308.21 0.00 Jun-73 JUNCTION 309.25 311.25 0.00 Jun-74 JUNCTION 309.09 310.09 0.00 Jun-75 JUNCTION 307.82 310.32
0.00 Jun-76 JUNCTION 306.33 309.83 0.00 Jun-l1 JUNCTION 303.84 305.34 0.00 Jun-18 JUNCTION 303.33 305.33 0.00 Jun-79 JUNCTION 302.97 304.97 0.00 Jun-80 JUNCTION 302.83 304.08 0.00 Jun-81
JUNCTION 302.63 303.88 0.00 Jun-82 JUNCTION 302.42 304.42 0.00 Jun-83 JUNCTION 301.34 303.84 0.00 Jun:c84 .... ........ JUNeTI ON .. ..-.3.01.63........ 3.02.88 .0.00 Jun-85 JUNCTION
301. 44 302.69 0.00 Jun-86 JUNCTION 300.81 302.81 0.00 Jun-87 JUNCTION 299.54 301.04 0.00 Jun-88 JUNCTION 299.94 301.19 0.00 Jun-89 JUNCTION 299.61 300.61 0.00 Jun-90 JUNCTION 299.35
299.35 0 • .00 Jun-91 JUNCTION 291.13 300.13 0 • .00 Jun-92 JUNCTION 291.27 298.52 .0.0.0 Jun-93 JUNCTION 296.59 297.59 0.00 Jun-94 JUNCTION 295.64 296.64 0.00 StormNET Page 3
Jun-95 JUNCTION 295.84 298.34 0.00 Jun-96 JUNCTION 307.85 309.10 0.00 Jun-97 JUNCTION 307.50 308.50 0.00 Jun-98 JUNCTION 306.96 308.96 0.00 Jun-99 JUNCTION 307.02 308.27 0.00 Out-37
OUTFALL -1.00 4.00 0.00 PONDI STORAGE 299.00 303.50 58452.00 POND2 STORAGE 293.00 298.50 704884.00 ************ Link Summary ************ Link From Node To Node Element Length Slope
~lanning's ID Type ft % Roughness -----------------------------------------------------------~~~--------------------------~~-12 JUn-129 JB13 CONDUIT 72.6 0.7025 0.0150 15 JB15 Jun-B6
CONDUIT 34..3 0.7003 0.0150 Con-169 Jun-62 Jun-63 CONDUIT 54.0 0.7034 0.0150 Con-17 0 Jun-63 Jun-64 CONDUIT 151.1 0.7016 0.0150 Con-171 Jun-64 Jun-65 CONDUIT 153.3 0.6980 0.0150 Con-172
Jun-65 Jun-66 CONDUIT 176.5 0.7027 0.0150 Con-173 Jun-66 Jun-67 CONDUIT 67.5 0.6965 0.0150 Con-174 Jun-67 Jun-68 CONDUIT 175.7 0.6999 0.0150 Con-175 Jun-69 Jun-68 CONDUIT 103.8 0.7033
0.0150 Con-176 Jun-6B Jun-70 CONDUIT 171. 7 0.6990 0.0150 Con-l77 Jun-70 JE1 CONDUIT 196.7 0.7015 0.0150 Con-178 JBl JB2 CONDUIT 39.7 0.7056 0.0150 Con-179 JB2 JB4 CONDUIT 716.2 0.6996
0.0150 Con-180 Jun-73 JB3 CONDUIT 39.9 0.6775 0.0150 ICon-181 Jun-74 JB3 CONDUIT 16.3 0.6757 0.0150 j Con-182 JB3 Jun-75 CONDUIT 165.1 0.7025 0.0150 Con-la3 Jun-75 Jun-76 CONDUIT 213.4
0.6982 0.0150 Con-184 Jun-76 JB2 CONDUIT 77.9 0.7058 0.0150 Con-185 Jun-72 JB1 CONOUIr 93.5 0.6952 0.0150 Con-lB6 Jun-77 Jun-7B CONDUIT 72.6 0.7023 0.0150 Con-187 Jun-7B Jun-79 CONDUrT
50.9 0.7071 0.0150 Con-1B8 Jun-79 Jun-82 CONDUIT 79.2 0.6942 0.0150 Con-lB9 Jun-BO Jun-Bl CONDUIT 2B.9 0.6928 0.0150 Con-190 Jun-81 Jun-B2 CONDUIT 30.4 0.6910 0.0150 Con-l91 Jun-82 Jun-83
CONDUIT 153.9 0.7019 0.0150 Con-192 JB4 Jun-132 CONDUIT 229.1 0.69B4 0.0150 Con-193 Jun-83 JB4 CONDUIT 81.B 0.6967 0.0150 Con-194 Jun-132 POND1 CONDUIT 23.7 0.7179 0.0150 Con-195 Jun-96
Jun-9B CONDUIT 126.2 0.7053 0.0150 Con-l96 Jun-97 Jun-98 CONDUIT 76.7 0.7042 0.0150 Con-197 JUn-98 Jun-101 CONDUIT 252.5 0.6969 0.0150 Con-198 Jun-99 Jun-l00 CONDUIT 166.7 0.6961 0.0150
Con-199 Jun-lOO Jun-10l CONDUIT 93.B 0.7038 0.0150 Con-200 Jun-101 JBS CONDUIT 374.13 0.7017 0.0150 Con-201 JB5 JBG CONDUIT 157.B 0.6971 0.0150 Con-202 Jun-102 JBS CONDU!T 11.1 0.7201
0.0150 Con-203 JB6 JB10 CONDUIT 249.2 0.7022 0.0150 Con-204 Jun-l04 Jun-l03 CONOOIT 86.1 0.6969 0.0150 Con-205 Jun-103 Jun-112 CONDUIT 106.9 0.4116 0.0150 Con-206 Jun-110 Jun-l09 CONDUIT
258.3 0.7006 0.0150 Con-207 Jun-109 Jun-108 CONDUIT 250.3 0.6990 0.0150 Con-208 Jun-108 Jun-l06 CONOUIT 5B.2 0.7041 0.0150 Con-209 Jun-l06 Jun-105 CONDUIT 165.8 0.6996 0.0150 Con-210
Jun-l05 JB7 CONDUIT 21.2 0.7075 0.0150 Con~211" -JBT JB6 CONDUIT--67;5 --"-0~695a .-0~0150 Con-212 Jun-134 JB7 CONDUIT 5.4 0.7449 0.0150 Con-213 Jun-l11 JBB CONDUIT 99.9 0.7006 0.0150
Con-214 JB8 Jun-1l3 CONDUIT 69.5 0.7048 0.0150 Con-l15 Jun-1l2 JBB CONDUIT 49.3 0.7104 0.0150 Con-216 Jun-113 Jun-118 CONDUIT 46.0 0.6963 0.0150 Con-217 Jun-115 JB9 CONDUIT 103.8 0.6935
0.0150 Con-218 Jun-1l4 Jun-113 CONDUIT 119.1 0.6970 0.0150 Con-219 Jun-117 JB13 CONDUIT 106.8 4.7945 0.0150 Con-no JB9 Jun-114 CONDUIT 116.3 0.7052 0.0150 Con-221 Jun-1l6 JB9 CONDUIT
42.B 0.7004 0.0150 StormNET Page 4
---------Con-222 Con-223 Con-224 Con-225 Con-l26 Con-227 Con-228 Con-229 Con-230 Con-231 Con-l32 Con-234 Con-235 Con-236 Con-237 Con-238 Con-239 Con-240 Con-242 Con-243 Con-244 Con-245
Con-246 Con-247 Con-248 Con-249 Con-l50 Con-251 Con-252 Con-257 Con-25B Con-259 Con-260 Con-261 Con-262 Con-263 Con-2611 Con-265 Con-266 Con-267 JE10 JUn-118 Jun-1l9 Jun-120 Jall JE12
Jun-122 Jun-121 Jun-128 JE13 JB14 Jun-127 Jun-123 Jun-124 Jun-125 Jun-126 Jun-130 Jun-B4 Jun-8S Jun-B6 Jun-S8 Jun-S9 JE16 Jun-B7 JB17 Jun-90 Jun-92 Jun-91 JB18 Jun-131 JB20 Jun-137 JE21
JB22 Jun-93 Jun-94 Jun-9S Jun-139 Jun-140 Jun-l4l Jun-1l9 JB10 Jun-120 JEll JE12 Jun-130 Jun-121 JSll Je13 JB14 JUn-123 JB14 Jun-124 Jun-125 Jun-126 JB12 POND2 JB1S JB15 JE16 Jun-87
Jun-87 JE20 JB16 Jun-91 JB17 Jun-91 JBll Jun-131 POND2 JBl7 JB20 JB22 JS18 Je21 JB22 JB18 JIl21 Out-37 Out-37 CONDUIT CONDUIT CONDUIT CONDUIT CONDUIT CONDUIT CONDUIT CONDUIT CONDUIT
CONDUIT CONDUIT CONDUIT CONDUIT CONDUIT CONDUIT CONDUIT CONDUIT CONDUIT CONDUIT CONDUIT CONDUIT CONDUIT CONDUIT CONDUIT CONDUIT CONDUIT CONDUIT CONDUIT CONDUIT CONDUIT CONDUIT CONDUIT
CONDUIT CONDUIT CONDUIT CONDUIT CONDUIT CONDUIT CONDUIT CONDUIT CONDUIT 124.1 128.9 1711. 0 284.4 79.8 229.3 56.7 31.4 126.1 77 .1 86.2 22.6 65.7 68.4 66.5 125.7 68.9 83.2 55.6 266.6
57.0 9.8 33.0 84.5 146.4 26.9 20.5 101.5 7B.4 241.5 79.B 53.0 136.1 32.9 24.5 211.2 85.5 38.1 435.3 362.7 0.7013 0.6981 0.6955 0.6997 0.7022 0.7022 0.7052 0.7004 0.6978 0.7002 0.7075
0.7077 0.7006 0.7015 0.6922 0.7002 0.6963 0.6971 0.701B 0.6977 0.7022 0.7150 0.6972 0.69B6 0.7034 0.7068 0.6839 0.6999 0.7012 0.6997 0.7018 0.6977 0.6979 0.7002 0.6936 0.7036 0.7018
0.6558 68.B01l7 80.9231 0.0150 0.0150 0.0150 0.0150 0.0150 0.0150 0.0150 0.0150 0.0150 0.0150 0.0150 0.0150 0.0150 0.0150 0.0150 0.0150 0.0150 0.0150 0.0150 0.0150 O. 0150 0.0150 0.0150
0.0150 0.0150 0.0150 0.0150 0.0150 0.0150 0.0150 0.0150 0.0150 0.0150 0.0150 0.0150 0.0150 0.0150 0.0150 0.0150 0.0150 pond1high pondllow pond2hiqh pond21ow POND1 PONDI POND2 POND2 Jun-140
Jun-HO Jun-141 Jun-141 ORIFICE ORIFICE ORIFICE ORIFICE **~****************** Cross Section Summary ********************* Link Shape Depth/width No. of Cross Full Flow Design Diameter
Barrels Sectional Hydraulic Flow ID Area Radius Capacity it it ft' ft cis ~-----------------------------------------------------------------~-----------------------------12 CIRCULAR
1.00 1. 00 ·1 0.79 0.25 2.59 15 CIRCULAR 1.50 1.50 1 1.77 0.38 7.62 Con-169 CIRCt'LAR 1.00 1.00 1 0.79 0.25 2.59 Con-l?O CIRCULAR 1.25 1.25 1 1.23 0.31 4.69 Con-171 CIRCULAR 1.50 1.50
1 1.77 0.38 7.61 Con-l?2 CIRCt'LAR 2.00 2.00 1 3.14 0.50 StormNET Page 5
16.44 Con-173 CIRCULAR 2.00 2.00 1 3.14 0.50 16.36 Con-114 CIRCULAR 2.00 2.00 1 3.14 0.50 16.40 Con-175 CIRCULAR 1.00 1.00 1 0.79 0.25 2.59 Con-176 CIRCULAR 2.50 2.50 1 4.91 0.63 29.72
Con-l77 CIRCULAR 2.50 2.50 1 4.91 0.63 29.77 Con-178 CIRCULAR 3.00 3.00 1 7.07 0.75 48.56 Con-179 CIRCULAR 3.00 3.00 1 7.07 0.75 48.35 Con-laO CIRCULAR 2.00 2.00 1 3.14 0.50 16.14 Con-181
CIRCULAR 1.00 1.00 1 0.79 0.25 2.54 Con-182 CIRCULAR 2.00 2.00 1 3.14 0.50 16.43 Con-183 CIRCULAR 2.50 2.50 1 4.91 0.63 29.70 Con-184 CIRCULAR 2.50 2.50 1 4.91 0.63 29.86 Con-ISS CIRCULAR
1.50 1.50 1 1.77 0.38 7.59 Con-186 CIRCULAR 1.50 1.50 1 1.77 0.38 7.63 Con-187 CIRCULAR 2.00 2.00 1 3.14 0.50 16.49 Con-18S CIRCULAR 2.00 2.00 1 3.14 0.50 16.34 Con-189 CIRCULAR 1.25
1.25 1 1.23 0.31 4.66 Con-190 CIRCULAR 1.25 1.25 1 1.23 0.31 4.65 Con-191 CIRCULAR 2.00 2.00 1 3.14 0.50 16.43 Con-192 CIRCULAR 3.50 3.50 1 9.62 0.88 12.87 Con-193 CIRCULAR 2.50 2.50
1 4.91 0.63 29.67 Con-194 CIRCULAR 3.50 3.50 1 9.62 0.B8 73.88 Con-195 CIRCULAR 1.25 1.25 1 1.23 0.31 4.70 Con-196 CIRCULAR 1.00 1.00 1 0.79 0.25 2.59 Con-197 CIRCULAR 2.00 2.00 1 3.14
0.50 16.37 Con-19B CIRCULAR 1.25 1.25 1 1.23 0.31 4.67 Con-199 CIRCULAR 1.50 1.50 1 1. 77 0.39 7.64 Con-200 CIRCULAR 2.50 2.50 1 4.91 0.63 29.78 Con-201 CIRCULAR 3.50 3.50 1 9.62 0.88
72.80 Con-202 CIRCULAR 1.50 1.50 1 1. 77 0.38 7/13· Con-203 CIRCULAR 3.50 3.50 1 9.62 0.S8 73.07 Con-204 CIRCULAR 1.5::1 1.50 1 1.77 0.38 7.60 Con-205 CIRCULAR 2.00 2.00 1 3.1iJ C.50
12.58 Con-206 CIRCU:'!\I\ 1.50 1.50 1 1. 77 0.38 7.62 Con-207 CIRCULAR 2.00 2.00 1 3.14 0.50 16.39 StormNET PageS
Con-208 CIRCULAR 2.00 2.00 1 3.14 0.50 16.45 Con-209 CIRCULAR 2.50 2.50 1 4.91 0.63 29.73 Con-210 CIRCULAR 2.50 2.50 1 4.91 0.63 29.90 Con-211 CIRCULAR 2.50 2.50 1 4.91 0.63 29.65 Con-2I2
CIRCULAR 1.25 1.25 1 1. 23 0.31 4.83 Con-213 CIRCULAR 1.50 1.50 1 1. 77 0.38 7.62 Con-214 CIRCOLAR 2.50 2.50 1 4.91 0.63 29.84 Con-2I5 CIRCULAR 2.00 2.00 1 3.14 0.50 16.52 Con-216 CIRCULAR
3.00 3.00 1 7.07 0.75 48.23 Con-217 CIRCULAR 1.50 1.50 1 1.77 0.38 7.58 Con-21B CIRCULAR 2.00 2.00 1 3.14 0.50 16.37 Con-219 CIRCULAR 1.25 1.25 1 1.23 0.31 12.26 Con-220 CIRCULAR 2.00
2.00 1 3.14 0.50 16.46 Con-221 CIRCULAR 1.25 1.25 1 1.23 0.31 4.69 Con-222 CIRCULAR 3.50 3.50 1 9.62 0.88 73.02 Con-223 CIRCULAR 3.00 3.00 1 7.07 0.75 48.30 Con-224 CIRCULAR 4.00 4.00
1 12.57 1. 00 103.82 Con-225 CIRCULAR 4.00 4.00 1 12.57 1.00 104.14 Con-226 CIRCULAR 4.00 4.00 1 12.57 1.00 104.32 Con-227 CIRCULAR 4.00 4.00 1 12.57 1.00 104.32 Con-228 CIRCULAR 1.00
1.00 1 0.79 0.25 2.59 Con-229 CIRCULAR 1.25 1.25 1 1.23 0.31 4.69 Con-230 CIRCULAR 1.00 1.00 1 0.79 0.25 2.58 Con-231 CIRCULAR 1.25 1.25 1 1.23 0.31 4.68 Con-232 CIRCULAR 1.25 1.25 1
1.23 0.31 4.71 Con-234 CIRCULAR 1.00 1.00 1 0.79 0.25 2.60 Con-235 CIRCULAR 1.50 1.50 1 1.77 0.38 7.62 Con-236 CIRCULAR 1.50 1.50 1 1. 77 0.38 7.63 Con-237 CIRCULAR 1.50 1.50 1 1.77
0.38 7.57 Con-23B CIRCULAR 2.00 2.00 1 3.14 0.50 16.41 Con-2-39 CIRCULAR -4.50 4.50 1 15.90 1,13 142.21 Con-Z40 CIRCULAR 1.25 1.25 1 1.23 0.31 4.67 Con-242 CIRCULAR 1.25 1.25 1 1.23
0.31 4.69 Con-243 CIRCULAR 2.00 2.00 1 3.14 0.50 16.38 Con-244 CIRCULAR 1.25 1.25 1 1.23 0.31 4.69 Con-245 CIRCULAR 1.00 1.00 1 0.79 0.25 StormNET Page 7
-----------------------------------------------------------------------------------------------2.61 Con-246 CIRCULAR 2.50 2.50 1 4.91 0.63 29.66 Con-247 CIRCULAR 1.50 1.50 1 1.77 0.38
7.61 Con-248 CIRCULAR 2.50 2.50 1 4.91 0.63 29.81 Con-249 CIRCULAR 1.00 1.00 1 0.79 0.25 2.60 Con-250 CIRCULAR 1.25 1.25 1 1.23 0.31 4.63 Con-251 CIRCULAR 3.00 3.00 1 7.07 0.75 48.36
Con-252 CIRCULAR 3.00 3.00 1 7.07 0.75 48.40 Con-257 CIRCULAR 3.00 3.00 1 7.07 0.75 48.35 Con-258 CIRCULAR 2.50 2.50 1 4.91 0.63 29.78 Con-259 CIRCULAR 1.00 1.00 1 0.79 0.25 2.58 Con-260
CIRCULAR 3.00 3.00 1 7.07 0.75 48.29 Con-261 CIRCULAR 3.00 3.00 1 7.07 0.75 48.37 Con-262 CIRCULAR 1. 00 1.00 1 0.79 0.25 2.57 Con-263 CIRCULAR 1.00 1.00 1 0.79 0.25 2.59 Con-264 CIRCULAR
2.50 2.50 1 4.91 0.63 29.76 Con-265
CIRCULAR 1.50 1.50 1 1.77 0.38 7.37 Con-266 CIRCULAR 5.00 5.00 1 19.63 1.25 1612.29 Con-267 CIRCULAR 5.00 5.00 1 19.63 1.25 2030.49 ************************** Volume Depth Runoff Quantity
Continuity acre-ft inches ************************** ----~---Total PreCipitation t " .... ~ 59.843 11.170 Surface Runoff .-.. ,.. ...... 4.713 0.660 Continuity Error (l) .... ,. -0.000
************************** Volume Volume Flow Routing Continuity acre-ft Mgallons *****.******************** --------External Inflow 0.000 0.000••• t ••• I •• External Outflow .........
46.202 15.055 Initial Stored Volume .... 0.000 0.000 Final Stored Volume ....... 0.200 0.065 Continuity Error ('5) ...... -0.001 ****************************************** CompOSite
Curve Number Computations Report ****************************************** --_..... _---------Subbasin 01 Area Soil Soil/Surface Description (acres) Group CN 4.78 73.00 composite Area
& Weighted CN 4.76 73.00 StormNET PageS
Subbasin 02 Soil/Surface Description Composite Area Ii Weighted CN Subbasin 03 Soil/Surface Description Composite Area Ii Weighted CN Subbasin 04 Soil/Surface Description Composite Area
& Weighted eN Subbasin 05 Soil/Surface Description Composite Area & Weighted CN Subbasin 06 Soil/Surface Description Composite Area & Weighted CN Subbasin 07 Soil/Surface Description
Composite Area & Weighted CN Subbasin OB Soil/Surface Description Comp0site-Al!ea &~leighted GN Subbasin 09 Soil/Surface Description Composite Area & weighted eN StormNET Area (acres)
0.58 0.58 Area (acres) 0.47 0.47 Area (acres) 0.44 0.44 Area (acres) 0.23 0.23 Area (acres) 0.72 0.72 Area (acres) 0,69 0.69 Area (acres) 0.34 -0.34 Area (acres) 0.37 0.37 Soil Group
Soil Group Soil Group Soil Group Soil Group Soil Group soil Group Soil Group CN 97.00 97.00 eN 97.00 97.00 CN 97.00 97.00 CN 97.00 97.00 CN 97.00 97.00 eN 73.00 73.00 eN 72.00 72.00
eN 93.00 93.00 Page 9
Subbadn 10 soil/Surface Description Composite Area (, Weighted CN Subbasin 11 Soil/Surface Oescription Composite Area (, Wei9~ted CN Subbasin 12 Soil/surface Description Composite Area
(, Weighted eN Subbasin 13 Soil/Surface Oescription Composite Area (, Weighted CN Subbasin 14 Soil/Surface Description composite Area « Keighted CN Subbasin 15 Soil/Surface Description
Composite Area (, Weighted eN Subbasin 16 Soil/Surface Description Composite Area & Weighted CN Subbasin 17 Soil/Surface Description Composite Area (, Weighted CN StormNET Area Soil
(acres) Group CN 1.01 82.00 1. 01 82.00 Area Soil (acres) Group CN 0.69 97.00 0.69 97.00 Area Soil (acres) Group CN 5.00 12.00 5.00 72.00 Area Soil (acres) Group CN 1. 70 98.00 1.70
98.00 Area Soil (acres) Group eN 0.30 98.00 0.30 98.00 Area Soil (acres) Group CN 0.76 98.00 0.76 98.00 Area Soil (acres) Group eN 0-.93 98,00 0.93 98.00 Area soil (acres) Group CN 0.83
98.00 0.83 98.00 Page 10
Subbasin 18 Soil/Surface Description Composite Area & Weighted CN Subbasin 19 Soil/Surface Description Composite Area &Weighted CN Subbasin 20 Soil/Surface Description Composite Area
& Weighted CN Subbasin 21 Soil/Surface Description Composite Area & Weighted CN Subbasin 22 Soil/surface Description Composite Area & Weighted CN Subbasin 23 Soil/Surface Description
composite Area ~ weighted eN Subbasin 24 Soil/Surface Description composite Area & Weighted CN Subbasin 25 Soil/Surface Description StormNET Area (acres) 5.00 5.00 Area (acres) 1.18
1.19 Area (acres) 0.63 0.63 Area (acres) 0.64 0.64 Area (acres) 0.74 0.74 Area (acres) 5,00 5.00 Area (acres) 5.00 5.00 Area (acres) 0.61 Soil Group Soil Group soil Group Soil Group
Soil Group Soil Group soil Group Soil Group CN 72.00 72.00 CN 90.00 90.00 CN 90.00 90.00 CN 90.00 90.00 CN 72.00 72.00 CN 72.00 72.00 CN 72.00 72.00 CN 93.00 Page 11
Composite Area & Weighted eN Subbasin 26 Soil/Surface Description Composite Area & Weighted eN Subbasin 27 Soil/Surface Description Composite Area & Weighted CN Subbasin 2B Soil/Surface
Description Composite Area & Weighted CN Subbasin 29 Soil/Surface Description Composite Area & Weighted CN Subbasin 30 Soil/Surface Description Composite Area & Weighted CN Subbasin
31 Soil/Surface Description Composite Area & Weighted CN Subbasin 32 Soil/surface -Description Composite Area & Weighted CN Subbasin 33 Soil/Surface Description 0.61 Area (acres) 0.47
0.47 Area (acres) 1.10 1.10 Area (acres) 1. 60 1.60 Area (acres} 0.97 0.97 Area (acres) 3.52 3.52 Area {acres} 0.76 0.76 Area {ac):es} 0.44 0.44 Area (acres) soil Group soil Group Soil
G):oup Soil Group Soil Group Soil G):oup Soil -Group Soil Group 93.00 CN 93.00 93.00 eN 90.00 90.00 CN 88.00 88.00 eN 95.00 95.00 CN 72.00 72.00 CN 98.00 98.00 eN 98.00 99.00 eN StormNET
Page 12
Composite Area & Weighted CN Subbasin 34 Soil/Surface Description Composite Area & Weighted CN Subbasin 35 Soil/Surface Description Composite Area « Weighted CN Subbasin 36 Soil/Surface
Description Composite Area & Weighted CN Subbasin 37 Soil/Surface Description Composite Area & Weighted CN Subbasin 3(1 Soil/Sur:face Description Composite Area & Weighted eN Subbasin
39 Soil/Surface Description Composite Area & lie.ighted eN Subbasin 40 Soil/Surface Description Composite Area & Weighted CN Subbasin 41 Soil/Surface Description StormNET 0.24 97.00
0.24 97.00 Area Soil (acres) Group CN 0.67 90.00 0.67 90.00 Area Soil (acres) Group CN 0.41 93.00 0.41 93.00 Area Soil (acres) Group eN 0.92 92.00 0.92 92.00 Area soil (acr:es) Group
CN 0.25 97.00 0.25 97.00 Area soil (acres) Group CN 0.41 95.00 0.41 95.00 Area Soil (acres) Group CN 0.34 93.00 0.34 93.00 . Area Soil (acres) Group CN 0.64 95.00 0.64 95.00 Area Soil
(actes) Group eN Page 13
Composite Area & Weighted CN Subbasin 42 Soil/Surface Description Composite Area " Weighted CN Subbasin 43 Soil/Surface Description composite Area & weighted CN Subbasin 44 Soil/Surface
Description Composite Area & Weighted eN Subbasin 45 Soil/Surface Description composite Area " Weighted CN Subbasin 46 Soil/Surface Description composite Area " Weighted CN Subbasin
47 Soil/Surface Description Composite Area & l~eighted eN Subbasin 48 Soil/Surface Description composite Area & weighted CN Subbasin 49 StormNET 5.00 5.00 Area (acres) 5.00 5.00 Area
(acres) 5.00 5.00 Area (acres) 5.00 5.00 Area (acres) 0.11 0.11 Area (acres) 8.86 8.86 Area (acres) 0.26 0.26 Area (acres) 0.11 0.11 Area Soil Group Soil Group Soil Group Soil Group
Soil Group Soil Group Sol1 Group Soil 72.00 72.00 CN 72.00 72.00 CN 72.00 72.0() eN 72.00 72.00 eN 98.00 98.00 eN 12.00 72.00 CN 97.00 97.00 eN 98.00 98.00 Page 14
Soil/Surface Description CompOSite Area & Weighted CN Subbasin 50 Soil/Surface Description Composite Area & Weighted CN Subbasin 51 Soil/Surface Description composite Area &Weighted
CN Subbasin 52 Soil/Surface Description Composite Area & Weighted CN Subbasin 53 Soil/Surface Description Composite Area & Weighted CN Subbasin 54 Soil/Surface Description Composite
Area &Weighted eN Subbasin 55 Soil/Surface Description Composite Area & Weighted eN Soil/Surface Description Composite Area & Weighted CN Subbasin 51 StormNET (acres) 0.10 0.10 Area
(acres) 0.17 0.17 Area (acres) 0.29 0.29 Area (acres) 0.24 0.24 Area (acres) 0.08 0.08 Area (acres) 0.37 0.37 Area (acres) 0.44 0.44 Area (acres) 0.42 0.42 Group Soil Group Soil Group
Soil Group Soil Group Soil Group Soil Group So11 Group CN 98.00 98.00 CN 93.00 93.00 CN 95.00 95.00 CN 90.00 90.00 CN 85.00 85.00 CN 88.00 88.00 CN 95.00 95.00 CN 95.00 95.00 Page 15
Soil/Surface Description Composite Area & Weighted CN Subbasin 58 Soil/Surface Description Composite Area & Weighted CN Subbasin 59 Soil/Surface Description Composite Area & Weighted
CN Subbasin 60 soil/Surface Description Composite Area & Weighted CN Subbasin 61 Soil/surface Description Composite Area & Weighted CN Subbasin 62 Soil/Surface Description Composite
Area & Weighted CN Subbasin 63 Soil/Surface Description composite Area & Weighted eN SUbbasin 64 Soil/Surface Description Composite Area & Weighted CN Subbasin 65 StormNET Area (acres)
0.67 0.67 Area (acres) 0.13 0.13 Area (acres) 3.27 3.27 Area (acres) 0.67 0.67 Area (acres) 0.27 0.27 Area (acres) 0.22 0.22 Area (acres) 1.63 1.63 Area (acres) 0.39 0.39 Soil Group
Soil Group Soil Group Soil Group soil Group Soil Group Soil Group Soil Group CN 9B.00 98.00 CN 72.00 72.00 CN 9B.OO 98.00 CN 85.00 85.00 CN 90.00 90.00 eN B2.00 82.00 CN 77.00 77.00
CN 75.00 75.00 Page 16
Soil/Surface Description Area (acres) Soil Group CN Composite Area & Weighted CN 0.68 0.69 99.00 99.00 Subbasin 66 Soil/Surface Description Area (acres) Soil Group eN Composite Area
& Weighted CN 0.07 0.07 98.00 98.00 Subbasin 67 Soil/Surface Description Ax-ea (acres) Soil Group eN Composite Area & Weighted CN 0.38 0.38 95.00 95.00 Subbasin 68 Soil/surface Description
Area (acres) Soil Group CN Composite Area & Weighted CN 5.00 5.00 72.00 72.00 subbasin 69 Soil/Surface Description Area (acres) soil Group CN Composite Area & Weighted eN 4.91 4.91 77
.00 77.00 Subbasin 70 Soil/Surface Description Area (acres) 5011 Group eN Composite Area & Weighted CN 0.92 0.82 75.00 75.00 Subbasin 71 Soil/Surface Description Area (acres) Soil Gx-oup
CN Composite Area II< 1geighted CN 0.53 0.53 77.00 77.00 *************************************************** SCS TR-55 Time of Concentration Computations Report **************************************
****kk******* Sheet Flow Equation StormNET Page 17
Where: Tc = Time of Concentration (hra) n Manning's Roughness Lf Flow Length (ftl P -2 yr, 24 hr Rainfall (inches) Sf Slope (ft/ft) Shallow Concentrated Flow Equation V 16.1345 * (SfA
O.5) (unpaved surface) V 20.3282 * (SfA O.5) (paved surface) V -15.0 * (SfAO.5) (grassed waterway surface) V 10.0 * (SfA O.5) (nearly bare & untilled surface) V 9.0 * (SfAO.S) (cultivated
straight rows surface) V = 7.0 * (SfA O.5) (short grass pasture surface) V 5.0 * (SfA O.5) (woodland surface) V 2.5 * (SfAO.S) (forest w/heavy litter surface) Tc (Lf /V) /(3600 aec/hr)
Where: Tc Time of concentration (hrs) Lf Flow Length (ft) V = Velocity (ft/sec) Sf Slope (ft/ft) Channel Flow Equation V ~ (1.49 * (RA {2/3)) * (SfAO.5)) /n R = Aq /~lp Tc (Lf /V) /(3600
sec/hr) Where: TC -Time of Concentration (hra) Lt Flow Length (ftl R Hydraulic Radius (ftl Aq Flow Area (ft2 ) ~lp = Wetted perimeter (ftl V Velocity (it/sec) Sf -Slope (ft/ftl n l>!anning
• S Roughne s s Subbasin 01 Sheet Flow Computations Subarea A c Manning's Roughness: 0.40 0.40 0.00 Flow Length (ft): 300.00 0.00 Slope (%): 1.00 0.00 .2yr;24 hr Rainfall (in): 4.50
0.00 Velocity (tt/sec): 0.09 0.00 Computed Flow Time (minutes): 57.54 0.00 Subarea B Subarea 0.00 0.00 0.00 0.00 0.00 ===========~==========;==~_===_================~==============~~=====mmm=~=======
============== Total TOC (minutes): 57.54 StormNET Page 18
Subbasin 02 Sheet Flow Computations C Manning's Roughness: 0.00 Flow Length (ft): 0.00 Slope (%) : 0.00 2 yr, 24 hr Rainfall (in) : 0.00 Velocity (ft/sec) ; 0.00 Computed Flow Time (minutes)
: 0.00 Total TOC (~~nutes): Subbasin 03 Sheet Flow Computations C ~Ianning' s Roughness: 0.00 Flow Length (ft) : 0.00 Slope (%) : 0.00 2 yr, 24 hr Rainfall (in) : 0.00 Velocity (ft/sec)
: 0.00 Computed Flow Time (minutes) : 0.00 Subarea A Subarea B Subarea 0.10 0.00 165.62 0.00 1.00 0.00 4.50 0.00 0.23 0.00 11.80 0.00 11.80 Subarea A Subarea B Subarea 0.10 0.00 147.61
0.00 1.00 0.00 4.50 0.00 0.23 0.00 10.76 0.00 =====================~===============================~=~====================================== Total Toe (minutes): 10.76 Subbasin 04 -Sheet
Flow computations C 0.00 0.00 0.00 Hanning' S Roughness: Flow Length (ft): Slope (%1: Subarea A 0.10 154.97 1.00 Subarea B 0.00 0.00 0.00 Subarea 2 yr, 24 hr Rainfall (in): 4.50 0.00
StormNET Page 19
0.00 Velocity (ft/sec): 0.23 0.00 0.00 computed Flow Time (minutes): 11.19 0.00 0.00 Total TOe (minutes): 11.19 Subbasin 05 Sheet Flow Computations C 0.00 0.00 0.00 0.00 0.00 0.00 l-lanning'
S Roughnes s : Flol1 Length (ft) : Slope (%) : 2 yr, 24 hr Rainfall [in) : Velocity (ft/sec) : Computed Flow Time (minutes) : Subarea A 0.10 135.00 1.00 4.50 0.22 10.02 Subarea B 0.00
0.00 0.00 0.00 0.00 0.00 Subarea Total TOC (minutes): 10.02 Subbasin 06 Sheet Flow Computations C 0.00 0.00 0.00 0.00 0.00 0.00 l-Ianning's Roughness: Flow Length (ft): Slope (%): '2
yr, 24 hr Rainfall (in): Velocity (ft/sec): Computed Flow Time (minutes): Subarea A 0.10 300.00 1.00 4.50 0.26 18.98 Subarea :e 0.00 0.00 0.00 0.00 0.00 0.00 Subarea Total TOC (minutes):
18.96 Subbasin 07 Sheet Flow Computations StormNET Page 20
----------------------C 0.00 0.00 0.00 0.00 0.00 0.00 Manning's Roughness: Flow Length (ft) : Slope (%) : 2 yr, 24 hr Rainfall (in) : Velocity (ft/sec) : Computed Flow Time (minutes)
: Subarea A 0.40 229.12 1.00 4.50 0.08 46.3e Subarea B 0.00 0.00 0.00 0.00 0.00 0.00 Subarea Total TOC (minutes): 46.38 Subbasin De Sheet Flow computations C 0.00 0.00 0.00 0.00 0.00
0.00 Manning's Roughness: Flow Length (ft) : Slope (%) : 2 yr, 24 hr Rainfall (in) : Velocity eft/sec): Computed Flow Time (minutes) : Subarea A 0.40 142.49 1.00 4.50 0.07 31. 72 Subarea
B 0.00 0.00 0.00 0.00 0.00 0.00 Subarea Total TOC (minutes): 31.72 Subbasin 09 Sheet Flow Computations C 0.00 0.00 0.00 0.00 0.00 0.00 Manning's Roughness: Flow Length (ft) : Slope ('ii)
: 2 yr, 24 hr Rainfall (in) : Velocity (ft/sec) : Computed Flow Time (minutes): Subarea A 0.10 213.78 1.00 4.50 0.25 14.47 Subarea B 0.00 0.00 0.00 0.00 0.00 0.00 Subarea StormNET Page
21
Total TOC (minutes): 14.47 Subbasin 10 Sheet Flow Computations C 0.00 0.00 0.00 0.00 0.00 0.00 l~ann.ing I s Roughness: Flow Length (ft) : Slope (%) : 2 yr, 24 hr Rainfall (in) : Velocity
(ft/sec) : Computed F1ot~ Time (minutes) : Subarea A 0.40 131.22 1. 00 4.50 0.07 29.70 Subarea B 0.10 121.89 1.00 4.50 0.22 9.23 Subarea Total TOC (minutes): 19.47 Subbasin 11 Sheet
Flo;-l Computations C 0.00 0.00 0.00 0.00 0.00 0.00 ~lanning's Roughne s s : Flow Length (ft) : Slope (%) : 2 yr, 24 hr Rainfall (in) : Velocity (ft/sec) : Computed Flow Time (minutes)
: Subarea A 0.10 212.18 1.00 4.50 0.25 14.39 Subarea B 0.00 0.00 0.00 0.00 0.00 0.00 Subarea Total TOC (minutes): 14.39 'Subbasin' 12 Sheet Flow Computations c 0.00 0.00 Hanning's Roughness:
Flow Length (ft): Subarea A 0.40 213.25 Subarea B 0.00 0.00 Subarea StormNET Page 22
Slope (%) : 1. 00 0.00 0.00 2 yr, 24 hr Ralnfall (in) : 4.50 0.00 0.00 Velocity (ft/sec): 0.08 0.00 0.00 Computed Flow Time (minutes) : 43.79 0.00 0.00 Total TOC {minutes}: 43.79 Subbasin
13 Sheet Flow Computations C 0.00 0.00 0.00 0.00 0.00 0.00 Manning's Roughness: Flow Length (ft): Slope (t) : 2 yr, 24 hr Rainfall (in) : Velocity (ft/sec): Computed Flow Time (minutes)
: Subarea A 0.10 300.00 5.00 4.50 0.50 9.97 Subarea B 0.00 0.00 0.00 0.00 0.00 0.00 Subarea Total TOC (minutes): 9.97 Subbasin 14 Sheet Flow Computations c Manning's Roughness: 0.00
Flow Length (ft): 0.00 Slope (%0): 0.00 2 yr, 24 hr Rainfall {in}: 0.00 Velocity (ft/sec): 0.00 Computed Flow Time (minutes): 0.00 Total TOC (minutes): Subarea A 0.10 300.00 5.00 4.50
0.50 9.979.97 Subarea B 0.00 0.00 0.00 0.00 0.00 0.00 Subarea Subbasin 15 StormNET Page 23
Sheet Flow Computations Subarea A C Manning's Roughness: 0.10 0.00 Flol, Length {UI: 300.00 0.00 Slope (%) : 5.00 0.00 2 yr, 24 hr Rainfall (in) : 4.50 0.00 Velocity (ft/sec) : 0.50
0.00 Computed Flow Time (mim:tes) : 9.97 0.00 Total TOC (<<~nutesl: 9.97 Subbasin 16 Sheet Flow Computations subarea A C Manning's Roughness; 0.10 0.00 Flow Length (ft): 300.00 0.00
Slope (%): 5.00 0.00 2 yr, 24 hr Rainfall (in): 4.50 0.00 Velocity (tt/sec): 0.50 0.00 Computed Flow Time (<<~nutes): 9.97 0.00 Total TOC (minutes): 9.97 Subbasin 17 Sheet Flow Computations
subarea A C Manning' s--Roughness: 0.10 0,00 Flow Length (tt): 300.00 0.00 Slope (%1: 5.00 0.00 2 yr, 24 hr Rainfall (in): 4.50 0.00 Velocity (ft/sec): 0.50 0.00 Computed Flow Time (minutes):
9.97 StormNET Subarea B 0.00 0.00 0.00 0.00 0.00 0,00 Subarea B 0.00 0.00 0.00 0.00 0.00 0.00 Subarea B -0-.000.00 0.00 0.00 0.00 0.00 Subarea Subarea Subarea Page 24
0.00 Total TOC (minutes): 9.97 Subbasin IB Sheet Flow Computations C 0.00 0.00 0.00 0.00 0.00 0.00 l~anning' s Roughness: Flow Length (ft) : Slope (%) : 2 yr, 24 hr Rainfall (in) : Velocity
(ft/sec) : Computed Flow Time (rninctes) : Subarea A 0.40 198.31 1.00 4.50 O.OB 41.32 Subarea B 0.00 0.00 0.00 0.00 0.00 0.00 Subarea Total TOC (minutes): 41.32 Subbasin 19 Sheet Flow
Computations C 0.00 0.00 0.00 0.00 0.00 0.00 Manning's Roughness: Flow Length (ft) : Slope ('Ii) : 2 yr, 24 hr Rainfall (in) : velocity (ft/sec) : COI1'.puted Flow Time (minutes) : Subarea
A 0.40 195.10 1.00 4.50 0.08 40.78 Subarea B 0.10 300.00 1.00 4.50 0.26 IS.98 Subarea Total TOC (minutes): 29.86 Subbasin 20 Sheet Flow Computations c Manning's Roughness: Subarea A
0.40 Subarea B 0.10 Subarea StormNET Page 25
0.00 0.00 0.00 0.00 0.00 0.00 Flow Length (ft) : Slope (t) : 2 yr, 24 hr Rainfall (in) : Velocity (ft/sec): Computed Flow Time (minutes) : 124.78 1.00 4.50 0.07 28.52 300.00 1.00 4.50
0.26 18.98 Total TOC (minutes): 23.75 Subbasin 21 Sheet Flow Computations C 0.00 0.00 0.00 0.00 0.00 0.00 Hanning I s Roughness: Flow Length (ft) : Slope (t) : 2 yr, 24 hr Rainfall (in)
: Velocity (ft/sec) : Computed Flow Time (minutes) : Subarea A 0.40 123.89 LOO 4.50 0.07 29.36 Subarea B 0.10 300.00 1.00 4.50 0.26 18.98 Subarea Total TOC (minutes): 23.67 Subbasin
22 Sheet Flow Computations c 0.00 0.00 0.00 ·0.00 0.00 0.00 Hanning's Roughness; Flow Length (ft): Slope (%): 2 yr, 24 hr Rainfall (in): Velocity (ft/sec): Computed Flow Time (minutes):
Subarea A 0.40 145.92 1.00 4.50 0.08 32.33 Subarea B 0.00 0.00 0.00 0.00 0.00 0.00 Subarea Total TOe (minutes): 32.33 StormNET Page 26
Subbasin 23 Sheet Flow Computations C 0.00 0.00 0.00 0.00 0.00 0.00 Manning's Roughness: Flow Length (ft): Slope (%): 2 yr, 24 hr Rainfall (in): Velocity (ft/sec): Computed Flow Time
(minutes): Subarea A 0.40 171.98 1.00 4.50 0.08 36.87 Subarea B 0.00 0.00 0.00 0.00 0.00 0.00 Subarea Total TOC (minutes): 36.87 Subbasin 24 Sheet Flow computations C 0.00 0.00 0.00
0.00 0.00 0.00 Manning's Roughness: Flow Length (ft) : Slope (%) : 2 yr, 24 hr Rainfall (in) : Velocity (ft/sec) : Computed Flow Time (minutes) : Subarea A 0.40 126.02 1.00 4.50 0.07
28.75 Subarea B 0.00 0.00 0.00 0.00 0.00 0.00 Subarea Total TOC (minutes): 28.75 Subbasin 25 Sheet Flow Computations Subarea A Subarea B Subarea C ~Ianning's Roughness: 0.40 0.10 0.00
Flow Length (ft) : 41.90 164.64 0.00 Slope (%1 : 1.00 1.00 0.00 2 yr, 24 hr Rainfall (in) : 4.50 4.50 0.00 StormNET Page 27
Velocity !ft/sec) I 0.06 0.00 Computed Flow Time (minutes): 11.91 0.00 Total TOC (minutes): 11.83 Subbasin 26 Sheet Flow Computations Subarea A C Manning's Roughness: 0.40 0.00 Flow
Length (ft): 67.07 0.00 Slope ill: 1.00 0.00 2 yr, 24 hr Rainfall (in): 4.50 0.00 Velocity (ft/sec): 0.06 0.00 Co~puted Flow Time (minutes): 17 .36 0.00 Total TOC (minutes): 12.73 Subbasin
27 Sheet Flow Computations Subarea A C Manning's Roughness: 0.40 0.00 Flow Length (ft) : 120.14 0.00 Slope (%1 : 1.00 0.00 2 yr, 24 hr Rainfall (in) : 4.50 0.00 Velocity (ft/sec) : 0.07
0.00 Computed Flow Time (minutes) : 27.67 0.00 Total"'TOC'(minutes): . .... ·19,22 Subbasin 26 Sheet Flow Computations StormNET 0.23 11.75 Subarea B Subarea 0.10 103.43 1.00 4.50 0.21
B.I0 Subarea B Subarea 0.10 147.61 1.00 4.50 0.23 10.76 Page 28
Subarea A Subarea B Subarea C 0.00 Manning's Roughness: 0.40 0.00 Flow Length (ft) : 259.93 0.00 0.00 Slope (%) : 1.00 0.00 0.00 2 yr, 24 hr Rainfall (in) : 4.50 0.00 0.00 Velocity (ft/sec)
: 0.08 0.00 0.00 Computed Flow Time (minutes) : 51.31 0.00 0.00 Total TOC (minutes): 51.31 Subbasin 29 Sheet Flow Computations Subarea A Subarea B Subarea C Z,lanning's Roughness: 0.40
0.10 0.00 Flow Length (ft) : 73.90 137.04 0.00 Slope (%) : 1.00 1.00 0.00 2 yr, 24 hr Rainfall (in) : 4.50 4.50 0.00 Velocity (ft/sec) : 0.07 0.23 0.00 Computed Flow Time (minutes) :
18.76 10.14 0.00 Total TOC (minutes): 14.45 Subbasin 30 Sheet Flow Computations Subarea A Subarea B Subarea C Hanning's Roughness: 0.40 0.00 0.00 Flow Length eft): 300.00 0.00 0.00 ...Slope
... (.%l: .1.00 0.00 0.00 2 yr, 24 hr Rainfall (in): 4.50 0.00 0.00 Velocity (ft/sec): 0.09 0.00 0.00 Computed Flow Time (minutes): 57.54 0.00 0.00 Total TOC (minutes): 57.54 StormNET
Page 29
Subbasin 31 Sheet Flow Computations C Manning's Roughness; 0.00 Flow Length (ft) : 0.00 Slope (t) : 0.00 2 yr, 24 hr Rainfall (in) : 0.00 Velocity (ft/sec): 0.00 Computed Flow Time (minutes)
: 0.00 Total TOC (minutes): Subbasin 32 Sheet Flow Computations C Manning's Roughness: 0.00 Flow Length (ft) : 0.00 Slope (%) : 0.00 2 yr, 24 hr Rainfall (in) : 0.00 Velocity (ft/sec)
: 0.00 computed Flow Time (minutes) : 0.00 Total TOC (minutes): Subbasin 33 Sheet Flow Computations C Manning's Roughness: 0.00 Flow Length 1ft): 0.00 Slope (%l: StormNET Subarea A 0.10
217.67 1.00 4.50 0.25 14.69 14.69 Subarea A 0.10 185.00 1.00 4.50 0.24 12.89 12.89 Subarea A 0.10 178.74 1.00 Subarea B 0.00 0.00 0.00 0.00 0.00 0.00 Subarea B 0.00 0.00 0.00 0.00 0.00
0.00 subarea B 0.00 0.00 0.00 Subarea Subarea Subarea Page 30
0.00 2 yr, 24 hr Rainfal.l. (in) : 0.00 Vel.ocity (ft/sec) : 0.00 Computed Flow Time (minutes) : 0.00 Total TOC (minutes): Subbasin 34 Sheet Flow Computations C Manning's Roughness:
0.00 FloW Length (ft) : 0.00 Slope (%) : 0.00 2 yr, 24 hr Rainfall (inJ: 0.00 Velocity (ft/sec): 0.00 Computed Flow Time (minutes) : 0.00 Total Toe (minutes): Subbasin 35 Sheet Flow
Computations C Manning's Roughness: 0.00 Flow Length (ft): 0.00 Sl.ope (%): 0.00 2 yr, 24 hr Rainfall. (in): 0.00 Velocity (it/sec): 0.00 Computed Flow Time (minutes): 0.00 Total TOC
(minutes): Subbasin 36 StormNET 4.50 0.24 12.54 12.54 Subarea A 0.40 194.22 1. 00 4.50 0.08 40.64 40.64 Subarea A 0.40 147.45 1.00 4.50 O.OS 32.60 32.60 0.00 0.00 0.00 Subarea B 0.00
0.00 0.00 0.00 0.00 0.00 Subarea B 0.00 0.00 0.00 0.00 0.00 0.00 Subarea Subarea Page 31
-----------------------Sheet Flow Computations C Manning's Roughness: 0.00 Flow Length (ft) : 0.00 Slope (%) : 0.00 2 yr, 24 hr Rainfall (in) : 0.00 Velocity (ft/sec) : 0.00 Computed
Flow Time (minutes) : 0.00 Total TOC (minutes): Subbasin 37 Sheet Flow Computations C Manning's Roughness: 0.00 Flow Length (ft) : 0.00 Slope {%) : 0.00 2 yr, 24 hr Rainfall (in) : 0.00
Velocity (ft/sec): 0.00 computed Flo~1 Time {minutes) : 0.00 Total TOC (minutes}: Subbasin 38 Sheet Flo~1 Computations C Manning's Roughness: 0;00 Flow Length (ft} : 0.00 Slope (%) :
0.00 2 yr, 24 hr Rainfall (in) : 0.00 Velocity (ft/sec) : 0.00 Computed Flow Time (minutes) : 0.00 StormNET Subarea A 0.10 1"17.57 l.00 4.50 0.24 12.48 12.48 Subarea A 0.10 170.41 1.00
4.5C 0.24 12.07 12.07 Subarea A 0.40 46.87 1.00 4.50 0.06 13.03 Subarea B 0.00 0.00 0.00 0.00 0.00 0.00 Subarea B 0.00 0.00 0.00 0.00 0.00 O.CO Subarea B 0.10 54.36 1.00 4.50 0.19 4.84
Subarea Subarea Subarea Page 32
Total Toe (minutes): 8.94 Subbasin 39 Sheet Flow Computations C 0.00 0.00 0.00 0.00 0.00 0,00 Manning's Roughness: Flow Length (ft) : Slope (%) : 2 yr, 24 hr Rainfall (in) : Velocity
(ft/sec) : Computed Flow Time (minutes) : Subarea A 0.10 135.00 1.00 4.50 0.22 10.02 Subarea B 0.00 0.00 0.00 0.00 0.00 0.00 Subarea Total Toe (minutes): 10.02 Subbasin 40 Sheet Flow
Computations C 0.00 0.00 0.00 0.00 0.00 0.00 Manning's Roughness: Flow Length (ftl: Slope (%) : 2 yrJ 24 hr Rainfall (in) : Velocity (ft/sec): Computed Flow Time (minutes) : Subarea
A 0.10 169.45 1.00 4.50 0,23 12.02 Subarea B 0.00 0.00 0,00 0.00 0.00 0.00 Subarea Total Toe (minutes): 12.02 Subbasin 41 Sheet Flow Computations C 0.00 Nanning's Roughness: Subarea
A 0.40 Subarea B 0.00 Subarea StormNET Page 33
Flow Length (ft) : 200.27 C.OO 0.00 Slope (%) : 1.00 0.00 0.00 2 yr, 24 hr Rainfall (in) : 4.50 0.00 0.00 Velocity (ft/sec): o.oa 0.00 0.00 Computed Flow Time (minutes) : 41.65 0.00
0.00 Total TOC (minutes): 41. 65 Subbasin 42 Sheet Flow Computations Subarea A Subarea B Subarea C Manning's Roughness: 0.40 0.00 0.00 Flow Length (tt) : 191. 65 0.00 0.00 Slope (%)
: 1.00 0.00 0.00 2 yr, 24 hr Rainfall (in) : 4.50 0.00 0.00 Velocity (ft/sec): o.oa 0.00 0.00 Computed Flow Time (minutes) : 40.21 0.00 0.00 Total TOC (minutes): 40.21 Subbasin 43 Sheet
Flow Computations Subarea A Subarea B Subarea c Manning's Roughness: 0.40 0.00 0.00 Flow Length (ft): 1'1S.99 0.00 0.00 Slope (%): 1.00 0.00 0.00 2 yr, 24 hr Rainfall (in): 4.50 0.00
0.00 ~-.. --~Velocity-(ftlsec) :-~~o~,oa -0.00 0.00 Computed Flow Time (minutes): 38.07 0.00 0.00 Total TOC (minutes): 38.07 StormNET Page 34
Subbasin 44 Sheet Flow Computations C 0.00 0.00 0.00 0.00 0.00 0.00 Manning's Roughness: Flow Length (ft) : Slope ('II) : 2 yr, 24 hr Rainfall (in) : Velocity (ft/sec) : Computed Flow
Time (minutes) : Subarea A 0.40 215.89 1.00 4.50 0.08 44.23 Subarea B 0.00 0.00 0.00 0.00 0.00 0.00 Subarea Total TOC (w~nutes): 44.23 Subbasin 45 Sheet Flow Computations c 0.00 0.00
0.00 0.00 0.00 0.00 Manning's Roughness: Flow Length (ft) : Slope ('Is) : 2 yr, 24 hr Rainfall (in) : velocity (ft/sec): Computed Flow Time (minutes) : Subarea A 0.10 300.00 5.00 4.50
0.50 9.91 Subarea B 0.00 0.00 0.00 0.00 0.00 0.00 Subarea Total TOC (minutes): 9.97 Subbasin 46 Sheet Flow Computations Subarea A··· Subarea B . ·Subarea C Manning's Roughness: 0.40
0.00 0.00 Flow Length (ft) : 300.00 0.00 0.00 Slope ('II) : 1.00 0.00 0.00 2 yr, 24 hr Rainfall (in) : 4.50 0.00 0.00 Velocity (ft/sec) : 0.09 0.00 StormNET Page 35
0.00 0.00 computed Flow Time (minutes): 57.54 0.00 Total TOC (minutes): 57.54 Subbasin 47 Sheet Flow Computations C 0.00 0.00 0.00 0.00 0.00 0.00 Manning's Roughness: Flow Length (ft)
: Slope (%-) : 2 yr, 24 hr Rainfall (in) : Velocity (ft/sec): Computed Flow Time (minutes) : Subarea A 0.40 94.33 1.00 4.50 0.07 22.80 Subarea B 0.10 58.11 1.00 4.50 0.19 5.11 Subarea
Total TOC (minutes): 13.95 Subbasin 48 Sheet Flow Computations C 0.00 0.00 0.00 0.00 0.00 0.00 !1anning' s Roughness: Flow Length (ft) : Slope ('Ii) : 2 yr, 24 hr Rainfall (in) : Velocity
(ft/sec) : Computed Flow Time (minutes): Subarea A 0.10 135.00 1.00 4.50 0.22 10.02 Subarea B 0.00 0.00 0.00 0.00 0.00 0.00 Subarea Total TOC (minutes): 10.02 Subbasin 49 Sheet Flow
Computations Subarea A Subarea B Subarea StormNET Page 36
C Manning's Roughness: 0.00 Flow Length (ft) : 0.00 Slope (i) : 0.00 2 yr, 24 hr Rainfall (in) : 0.00 Velocity (ft/sec) : 0.00 Computed Flow Time (minutes) : 0.00 Total TOC (minutes):
Subbasin 50 Sheet Flow Computations C Manning's Roughness: 0.00 Flow Length (ft) : 0.00 Slope (%) : 0.00 2 yr, 24 hr Rainfall (in) : 0.00 velocity (ft/sec): 0.00 Computed Flow Time (minutes)
: 0.00 Total TOC (minutes): Subbasin 51 Sheet Flow Computations c Manning's Roughness: 0.00 Flow Length (ft): 0.00 Slope ('Is): .0 ..0.0 2 yr, 24 hr Rainfall (in): 0.00 Velocity (ft/sec):
0.00 Computed Flo~l Time (minutes): 0.00 Total TOC (minutes): StormNET 0.10 135.00 1.00 4.50 0.22 10.02 10.02 Subarea A 0.10 135.00 1.00 4.50 0.22 10.02 10.02 Subarea A 0.40 80.65 1.00
4.50 0.07 20.12 20.12 0.00 0.00 0.00 0.00 0.00 0.00 Subarea B 0.00 0.00 0.00 0.00 0.00 0.00 Subarea B 0.00 0.00 0.00 0.00 0.00 0.00 Subarea Subarea Page 37
Subbasin 52 sheet Flow Computations C Hanning I s Roughness: 0.00 Flow Length (tt) : 0.00 Slope ('!) : 0.00 2 yr, 24 hr Rainfall {in} : 0.00 Velocity (ft/sec) : 0.00 Computed Flow Time
(minutes) : 0.00 Total TOC (minutes): Subbasin 53 Sheet Flow Computations e Manning I s Roughness: 0.00 F1o~1 Length (ft) : 0.00 Slope (%) : 0.00 2 yr, 24 hr Rainfall (in) : 0.00 Velocity
(ft/sec): 0.00 Computed Flow Time (minutes) : 0.00 Total Toe [minutes): Subbasin 54 Sheet Flow Computations e Hanning's Roughness: 0.00 Flow Length (tt): 0.00 Slope (%): 0.00 StormNET
Subarea A 0.40 55.00 1.00 4.50 0.06 14.91 10.41 Subarea A 0.10 28.19 1.00 4.50 0.16 2.86 10.41 Subarea A 0.10 91.25 1.00 Subarea B 0.10 71.28 1.00 4.50 0.20 6.01 Subarea B 0.40 70.02
1.00 4.50 0.06 17.97 Subarea B 0.40 61. 45 1.00 Subarea Subarea Subarea Page 38
2 yr, 24 hr Rainfall (in) : 4.50 4.50 0.00 Velocity (ft/sec) : 0.21 0.06 0.00 Computed Flow Time (minutes) : 7.33 16.18 0.00 Total TOC (minutes): 11. 76 Subbasin 55 Sheet Flow Computations
C 0.00 0.00 0.00 0.00 0.00 0.00 ~IanningT s Roughness: Flow Length (ft) : Slope (%) : 2 yr, 24 hr Rainfall (in) : Velocity (ft/sec) : Computed Flow Time (minutes) : Subarea ;II 0.10
137.35 1.00 4.50 0.23 10.16 Subarea B 0.00 0.00 0.00 0.00 0.00 0.00 Subarea ~otal TOC (minutes): 10.16 Subbasin 56 Sheet Flow Computations C 0.00 0.00 0.00 0.00 0.00 0.00 Manning's Roughness:
Fl.ow Length (ft) : Slope (%) : 2 yr, 24 hr Rainfall (in) : Velocity (ft/sec) : Computed Flow Time (minutes) : Subarea A 0.10 134. 06 1.00 4.50 0.22 9.97 Subarea B 0.00 0.00 0.00 0.00
0.00 0.00 Subarea Total TOC (minutes): 9.97
subbasin 57 StormNET Page 39
-----------------------Sheet Flow Computations Subarea A Subarea B Subarea C 0.00 ~!anning' s Roughness: 0.10 0.00 Flow Length (ftl: 300.00 0.00 0.00 0.00 Slope (%) : 5.00 0.00 2 yr,
24 hr Rainfall (in) : 4.50 0.00 0.00 Velocity (ft/sec) : 0.50 0.00 0.00 0.00 Computed F~ow Time (minutes) : 9.97 0.00 Total TOC {minutes}: 9.97 Subbasin 58 Sheet Flow Computations Subarea
A Subarea B Subarea C ~fanning' s Roughness: 0.40 0.00 0.00 Flow Length (ft) : 54.39 0.00 0.00 Slope (%) : 1.00 0.00 0.00 2 yr, 24 hr Rainfall (in) : 4.50 0.00 0.00 Velocity (ft/sec):
0.06 0.00 0.00 Computed Flow Time (minutes) : 14.68 0.00 0.00 Total TOC (minutes): 14.68 =============--===~===~========~~=======~~===---======-=~===============-===~===-====~==~-=======
Subbasin 59 Sheet Flow Computations subarea A Subarea B Subarea c Manning's Roughness: 0.10 0.00 0.00 ··FlowLength· (fty: 300.00 0.00· 0.00 Slope (%): 1.00 0.00 0.00 2 yr, 24 hr Rainfall
(in): 4.50 0.00 0.00 Velocity (ft/sec): 0.26 0.00 0.00 computed Flow Time (minutes): 18.98 0.00 0.00 StormNET Page 40
Total TOC (minutes): 18.98 Subhasin 60 Sheet Flow Computations C 0.00 0.00 0.00 0.00 0.00 0.00 Manning's Roughness: Flow Length (ft) : Slope (%) : 2 yr. 24 hr Rainfall (in) : Velocity
(ft/sec) : Computed Flow Time {minutes) : Subarea A 0.40 84.36 1.00 4.50 0.07 20.85 Subarea B 0.00 0.00 0.00 0.00 0.00 0.00 Subarea Total TOC (minutes): 20.85 Subbasin 61 Sheet Flow
Computations C 0.00 0.00 0.00 0.00 0.00 0.00 I~anning • s Roughness: Flow Length (ftl: Slope (t) : 2 yr, 24 hr Rainfall (in) : Velocity 1ft/sec) : Com.puted Flow Time (minutes) : Subarea
A 0.10 300.00 1.00 4.50 0.26 18.98 Subarea B 0.00 0.00 0.00 0.00 0.00 0.00 Subarea Total TOC (minutes): 18.98 Subhasin 62 Sheet Flow Computations C 0.00 l-lanning's Roughness: Flow Length
(ft): Subarea A 0.10 212.03 Subarea B 0.00 0.00 Subarea StormNET Page 41
0.00 Slope (%) : 0.00 2 yr, 24 hr Rainfall (in) : 0.00 Velocity (ft/sec): 0.00 Computed Flow Time (minutes) : 0.00 Total TOC (minutes): Subbasin 63 Sheet Flow Coroputations C Manning's
Roughness: 0.00 Flow Length (ft) : 0.00 Slope ('II) : 0.00 2 yr, 24 hr Rainfall (in) : 0.00 Velocity (ft/sec) : 0.00 Computed Flow Time (minutes) : 0.00 Total TOC (minutes): Subbasin
64 Sheet Flow Computations C Manning's Roughness: 0.00 Flow Length (ftl: 0.00 Slope (%): 0.00 2 yr, 24 hr Rainfall (in): 0.00 Velocity (ft/sec): 0;00 Computed Flow Time (minutes): 0.00
Total TOC (minutes): 1.00 4.50 0.25 14.38 14.3a Subarea A 0.40 126. aa l.00 4.50 0.07 28.91 28.91 Subarea A 0.40 139.99 1.00 4.50 0.07 31.27 31.27 0.00 0.00 0.00 0.00 Subarea B 0.00
0.00 0.00 0.00 0.00 0.00 Subarea B 0.00 0.00 0.00 0.00 0.00 0.00 Subarea Subarea StormNET Page 42
Subbasin 65 Sheet Flow Computations C 0.00 0.00 0.00 0.00 0.00 0.00 Hanning' s Roughness: Flow Length (ft) : Slope (") : 2 yr, 24 hr Rainfall (in) : Velocity (ft/sec): computed Flow
Time (minutes) : subarea A 0.10 135.00 1.00 4.50 0.22 10.02 Subarea B 0.00 0.00 0.00 0.00 0.00 0.00 Subarea Total TOC (minutes): 10.02 Subbasin 66 Sheet Flow Computations C 0.00 0.00
0.00 0.00 0.00 0.00 Manning's Roughness: Flow Length (ft) : Slope (%) : 2 yr, 24 hr Rainfall (in) : Velocity (ft/sec) : Computed Flow Time (minutes) : Subarea A 0.10 300.00 5.00 4.50
0.50 9.97 Subarea B 0.00 0.00 0.00 0.00 0.00 0.00 Subarea Total TOC (minutes): 9.97 Subbasin 67 Sheet Flow Computations C 0.00 0.00 0.00 0.00 0.00 Manning's Roughness: Flow Length (ftl:
Slope ('lsI: 2 yr, 24 hr Rain!all Velocity (ft/sec): (in) : Subarea A 0.40 70.52 1.00 4.50 0.07 Subarea B 0.00 0.00 0.00 0.00 0.00 Subarea StormNET Page 43
computed Flow Time (minutes): 16.07 0.00 Total TOC (minutes): lS.07 Subbasin 68 Sheet Flow Computations Subarea A C ~!anning's Roughness: 0.40 0.00 Flow Length (ft) : 89.05 0.00 Slope
(t.) : 1.00 0.00 2 yr, 24 hr Rainfall (in) : 4.50 0.00 Velocity (ft/sec) : 0.07 0.00 Computed Flow Time (minutes) : 21.78 0.00 Total TOC (minutes): 21.78 Subbasin 69 sheet Flow Computations
Subarea A C l-!anning I S Roughness: 0.40 0.00 Flow Length (ft) : 300.00 0.00 Slope (t.) ! 1.00 0.00 2 yr, 24 hr Rainfall (in) : 4.50 0.00 Velocity (ft/sec): 0.09 0.00 Computed flow
Time (minutes) : 57.54 0.00 Total TOC (minutes): 57.54 Subbasin 70 Sheet flow Computations Subarea A C Subarea B 0.00 Subarea B 0.00 0.00 0.00 0.00 0.00 0.00 Subarea B 0.00 0.00 0.00
0.00 0.00 0.00 Subarea Subarea Subarea StormNET Page 44
----------------------------------------------------------------------------------------------------------------------------------------------------~lanning' 8 Roughness: 0.40 0.00 0.00
Flow Length (ft) : 105.79 0.00 0.00 Slope (!I) : 1. 00 0.00 0.00 2 yr, 24 hr Rainfall (in) : 4.50 0.00 0.00 Velocity (ft/sec) : 0.07 0.00 0.00 Computed Flow Time (minutes) : 24.99 0.00
0.00 Total TOC (minutes): 24.99 Subbasin 71 Sheet Flow Computations Subarea A Subarea B Subarea c Manning's Roughness: 0.40 0.00 0.00 Flow<Length (ft): 100.00 0.00 0.00 Slope (%): 1.00
0.00 0.00 2 yr, 24 hr Rainfall (in): L50 0.00 0.00 Velocity (ft/sec): 0.07 0.00 0.00 computed Flow Time (minutes): 23.89 0.00 0.00 Total TOC (minutes): 23.89 ******~****.***********
Subbasin Runoff Summary *********************** SUbbasin Total Total Peak Weighted Time of ID Precip Runoff Runoff Curve Concentration in in cfs Number days hh:rnm:ss 01 11.000 7.542
17.440 73.000 0 00:57:32 02 11.000 10.637 4.950 97.000 0 00:11:48 03 11.000 10.637 4.040 97.000 0 00:10:45 04 11.000 10.637 3.790 97.000 0 00: 11: 11 05 11.000 10.637 2.020 97.000 0
00:10:01 06 11.000 <10;<63'1 5i~60 9'1;000 0 00:18:58 07 11.000 7.541 2.840 73.000 a 00:46:22 08 11.000 7.404 1.670 72.000 0 00:31:43 09 11.000 10.145 2.9,0 93.000 0 00:14:28 10 11.000
8.743 6.850 82.000 0 00:19:27 11 11.000 10.631 5.560 97.000 0 00:14:23 12 11.000 7.405 3.770 72.000 0 00:43:47 13 11.000 10.759 14.900 98.000 0 00:10:00 14 11.000 10.759 2.640 98.000
0 00:10:00 15 11.000 10.759 6.690 98.000 0 00:10:00 16 11. 000 10.759 8.210 98.000 0 00:10:00 StormNET Page 45
1'1 11.000 10.759 7.250 98.000 0 00:10:00 18 11.000 7.404 2.380 72.000 0 00:41:19 19 11.000 9.770 7.220 90.000 0 00:29:52 20 11.000 9.770 4.200 90.000 0 00:23:45 21 11.000 9.770 4.290
90.000 0 00:23:40 22 11.000 7.405 3.550 72.000 0 00:32:19 23 11.000 7.405 3.810 72.000 0 00:36:52 24 11.000 7.405 3.650 72.000 0 00:28:45 25 11.000 10.145 5.100 93.000 0 00:11:49 26
11.000 10.145 3. B60 93.000 0 00:12:43 27 11.000 9.770 7.960 90.000 0 00:19:13 28 11.000 9.517 7.490 88.000 a 00:51:18 29 11.000 10.393 7.B50 95.000 a 00:14:27 30 11.000 7.4.05 12.630
72.000 0 00:57:32 31 11.000 10.759 6.160 98.000 0 00:14:41 32 11.000 10.759 3.690 98.000 0 00:12:53 33 11.000 10.637 2.040 97.000 0 00:12:32 34 11.000 9.770 3.540 90.000 0 00:40:3B 35
11.000 10.145 2.490 93.000 0 00:32:35 36 11.000 10.021 7.600 92.000 0 00:12:2B 37 11.000 10.637 2.110 97.000 0 00:12:04 38 11. 000 10.392 3.630 95.000 0 00;10:00 39 11. 000 10.145 2.940
93.000 0 00:10:01 40 11.000 10.392 5.340 95.000 0 00:12:01 41 11.000 7.405 3.000 72.000 0 00:41:38 42 11. 000 7.405 3.630 72.000 0 00:40:12 43 11.000 7.405 3.890 72.000 0 00:38:04 44
11.000 7.405 5.180 72.000 0 00:44:13 45 11.000 10.758 0.960 98.000 0 00:10:00 46 11. 000 7.405 31. 860 72.000 a 00:57:32 47 11.000 10.637 2.150 97.000 0 00:13:57 48 11.000 10.758 0.960
98.000 0 00:10:01 49 11.000 10.758 0.900 98.000 a 00:10:01 50 11.000 10.145 1.500 93.000 a 00:10:01 51 11.000 10.392 2.100 95.000 0 00:20:07 52 11.000 9.770 2.060 90.000 a 00:10:24 53
11.000 9.129 0.680 85.000 0 00:10:24 54 11.000 9.517 2.980 88.000 0 00:11:45 55 11.000 10.392 3.840 95.000 0 00:10:09 56 11.000 10.392 3.630 95.000 0 00:10:00 57 11.000 10.759 5.900
98.000 0 00:10:00 58 11.000 7.403 0.860 72.000 0 00:14:40 59 11.000 10.759 24.570 98.000 0 00:18:58 60 11.000 9.133 4.500 85.000 0 00:20:51 61 11.000 9.770 1.950 90.000 0 00:18:58 62
11. (lOa 8.743 1.650 82.000 0 00:14:22 63 11.000 8.082 8.820 77.000 0 00:28:54 64 11.000 7.812 1.960 75.000 0 00:31:16 65 11.000 10.759 5.960 9B.000 0 00;10;01 66 11.000 10.757 0.670
98.000 0 00:10:00 67 11.000 10.392 2.910 95.000 0 00:18:04 68 11.000 7.400 0.470 72.000 0 00:21:46 69 11.000 8.082 19.080 77.000 0 00:57:32 70 11.000 7.813 4.590 75.000 0 00:24:59 71
11.000 8.082 3.080 77.000 0 00:23:53 ----------------------------------------------~--------------------------System 11.000 8.843 296.76 ****************** Node Oepthsurnmary ***~**.***********
----------------------------~-----------------------------------------------------------Node Average Maximum Maximum Time of Max Total Total Retention ID Oepth Depth HGL Occurrence Flooded
Time Time Attained Attained Attained Volume Flooded ft ft ft days hh:mm acre-in minutes hh:mm;ss ----------------------------------------------------------------------~------------------JBl
0.36 2.16 308.22 0 12:18 0 0 0:00:00 JB10 0.57 3.50 303.22 0 12:08 3.BO 18 0:00:00 StormNET Page 46
JBll 0.57 2.82 298.47 0 12:25 0 0 0:00:00 JB12 0.60 3.02 298.11 0 12:25 a 0 0:00:00 JB13 0.18 1.00 299.52 0 12:29 a 0 0:00:00 JB14 0.21 1.25 299.23 0 12:08 0.46 27 0:00:00 JB15 0.22
1.50 302.55 a 12:07 0.11 13 0:00:00 JB16 0.26 1.37 300.32 0 12:15 a 0 0:00:00 JB17 0.27 1.43 299.59 0 12:16 0 0 0:00:00 JB18 0.46 3.00 298.24 0 12:10 1. 43 15 0:00:00 JB2 0.46 3.00 308.78
0 12:10 0.95 14 0:00:00 JB20 0.26 1.41 300.13 0 12:15 0 0 0:00:00 JB21 0.33 1.76 298.18 0 12:16 0 0 0:00:00 JB22 0.34 1.B5 297.32 0 12 :16 0 a 0:00:00 JB3 0.27 2.00 310.98 a 12:10 0.03
7 0:00:00 JB4 0.52 3.50 304.27 0 12:14 0.51 12 0:00:00 JB5 0.33 1.73 304.30 0 12:18 0 0 0:00:00 JB6 0.43 2.20 303.67 0 12:19 0 0 0:00:00 JB7 0.31 1.68 303.62 0 12:17 0 0 0:00:00 JB8
0.29 1.65 303.08 0 12:13 0 0 0:00:00 JB9 0.20 1.13 303.72 0 12:15 0 0 0:00:00 Jun-100 0.18 1.17 307.03 0 12:26 0 0 0:00:00 Jun-101 0.31 1.73 306.93 0 12:17 a 0 0:00:00 .Jun-102 0.23
1.19 303.84 0 12:40 a 0 0:00:00 .Jun-103 0.27 2.00 304.22 0 12:09 0.12 9 0:00:00 Jun-I04 0.18 1.06 303.88 0 12:15 0 0 0:00:00 Jun-I05 0.30 1.56 303.65 0 12:16 0 0 0:00:00 Jun-106 0.27
1. 70 304.95 0 12:15 0 0 0:00:00 Jun-10a 0.27 2.00 305.66 0 12:13 0.05 6 0:00:00 Jun-109 0.24 1. 42 306.83 0 12:16 0 0 0:00:00 Jun-110 0.20 1.50 308.72 0 12:14 0.00 3 0:00:00 Jun-1l1
0.20 1.50 303.63 0 12:09 0.02 7 0:00:00 Jun-112 0.27 2.00 303.78 0 12:14 0 2 0:00:00 Jun-113 0.35 2.05 302.99 0 12:13 0 0 0:00:00 Jun-1l4 0.22 1.32 303.09 0 12 :15 0 0 0:00:00 Jun-115
0.19 1.13 304.44 0 12:15 0 0 0:00:00 Jun-1l6 0.12 0.72 303.61 0 12:15 0 0 0:00:00 Jun-117 0.03 0.20 303.84 0 12:15 0 0 0:00:00 Jun-l18 0.37 2.26 302.88 0 12:13 0 0 0:00:00 Jun-1l9 0.57
3.50 302.35 0 12:10 0 0 0:00:00 Jun-120 0.55 2.72 300.36 0 12:25 0 0 0:00:00 Jun-121 0.20 1.25 297.12 0 12:22 0.20 25 0:00:00 Jun-122 0.08 0.41 296.68 0 12: 10 0 0 0:00:00 Jun-123 0.22
1.25 298.62 0 12:10 0 0 0:00:00 Jun-124 0.22 1.14 298.05 0 12:09 0 0 0:00:00 Jun-125 0.24 1.50 297.93 0 12:09 0.04 9 0:00:00 Jun-126 0.24 1.29 297.26 0 12:09 0 0 0:00:00 Jun-127 0.12
0.68 298.82 0 12:20 0 0 0:00:00 Jun-128 0.14 1.00 300.40 0 12:23 0.09 22 0:00:00 Jun-129 0.10 0.66 299.69 0 12:15 0 0 0:00:00 Jun-130 0.60 3.01 296.49 0 12:26 0 0 0:00:00 Jun-131 0.46
3.00 297.69 0 12:11 0.08 15 0:00:00 Jun-132 0.52 3.50 302.67 0 12:15 0.15 11 0:00:00 Jun-134 0.13 0.63 302.61 0 12:25 0 0 0:00:00 Jun-137 0.06 0.40 299.49 0 12:15 0 0 0:00:00 Jun-139
0.04 0.26 296.93 0 12:20 0 0 0:00:00 Jun-140 0.17 0.69 299.19 0 12:33 0 0 0:00:00 Jun-141 0.24 0.74 293.24 0 12:48 0 0 0:00:00 Jun-62 0.14 1.00 315.09 0 12: 10 0.03 10 0:00:00 Jun-63
0.16 1.00 314.71 0 12:13 0 0 0:00:00 Jun-64 0.22 1.50 314.15 0 12 :09 0.13 13 0:00:00 Jun-65 0.24 1.50 313.08 0 12:13 0 0 0:00:00 .Jun-66·5;{o.:'-67 . 0.2.6 0.28 . 1,.5.6.. 2.00 .311•.90.
311. 87 ... 0 . .12: 12 0 12:10 .0 o.oa 0 8 0:00:00 0:00:00 Jun-68 0.32 1. 73 310.37 0 12: 17 0 0 0:00:00 Jun-69 0.14 1.00 310.37 0 12:28 0.05 19 0:00:00 Jun-70 0.35 2.50 309.94 0 12:15
0.02 4 0:00:00 Jun-72 0.17 0.95 307.66 0 12:15 0 0 0:00:00 Jun-73 0.25 1.47 310.72 0 12:15 0 0 0:00:00 Jun-74 0.13 0.82 309.91 0 12:10 0 0 0:00:00 Jun-75 0.27 1.72 309.54 0 12:16 0 0
0:00:00 JUIl-76 0.30 1.53 307.86 0 12:16 0 0 0:00:00 Jun-77 0.20 1.16 305.00 0 12:25 0 0 0:00:00 StormNET Page 47
------------------------------------------------------------------------------------Jun-78 0.22 1.21 304.54 0 12:25 a 0 0:00:00 Jun-79 0.26 1.54 304-.51 0 12:20 a 0 0:00:00 Jun-SO 0.10
0.56 303.39 0 12:20 0 0 0:00:00 Jun-81 0.13 0.81 303.44 0 12:15 0 0 0:00:00 Jun-82 0.29 2.00 304.42 0 12:15 0.32 15 0:00:00 Jun-83 0.32 2.00 303.34 0 12:19 0 0 0:00:00 Jun-B4 0.14 0.84
302.47 0 12:15 a 0 0:00:00 Jun-85 0.18 1.25 302.69 0 12:07 0.13 12 0:00:00 Jun-86 0.23 1.49 302.30 a 12:18 0 0 0:00:00 Jun-87 0.17 1.04 300.58 0 12:20 a 0 0:00:00 Jun-88 0.15 0.98 300.92
0 12:20 0 0 0:00:00 Jun-89 0.11 0.64 300.25 0 12:25 a a 0:00:00 Jun-90 0.07 0.34 298.69 a 12:14 0 a 0:00:00 Jun-91 0.31 1. 64 298.77 0 12:15 a 0 0:00:00 Jun-92 0.15 1.00 29B.27 a 12:20
a 0 0:00:00 Jun-93 0.14 1.00 297.59 0 12:13 0.03 10 0:00:00 Jun-94 0.13 1.00 296.64 0 12:14 0.07 16 0:00:00 Jun-95 0.31 1.70 297.54 0 12:20 a a 0:00:00 Jun-96 0.16 1.25 309.10 a 12:
]0 0.02 7 0:00:00 Jun-97 0.15 1.00 308.50 a 12:15 0.27 28 0:00:00 Jun-98 0.22 1.22 308.18 0 12:15 0 0 0:00:00 Jun-99 0.14 0.86 307.88 0 12:30 0 a 0:00:00 Out-37 0.24 0.74 -0.26 0 12:49
0 0 0:00:00 POND1 0.39 2.30 301.30 0 12:33 a 0 0:00:00 POND2 0.79 3.70 296.70 a 12:48 0 a 0:00:00 ***************** Node Flow Summary ***************** Node Element Haximum Peak Time
of Maximum Time of Peak 10 Type Lateral Inflow Peak Inflow Flooding Flooding Inflow Occurrence Overflow Occurrence cis cts days hh:IlUl1 cfs days hh:mm -----------------------------------------------
------------~-----------------------JB1 JUNCTION 0.00 36.16 0 12:18 0.00 JBI0 JUNCTION 0.00 94.46 0 12:16 21.33 0 12:16 Jall JUNCTION 0.00 88.09 0 12:25 0.00 JB12 JUNCTION 0.00 95.69
a 12:25 0.00 JB13 JUNCTION 0.00 4.41 a 12:15 0.00 JB14 JUNCTION 0.00 6.41 0 12:16 1. 70 0 12:16 JB15 JUNCTION 0.00 8.38 a 12:15 0.76 a 12:15 JB16 JUNCTION 0.00 17 .23 a 12:15 0.00 JE17
JUNCTION 0.00 18.68 a 12:16 0.00 JE1S JUNCTION 0.00 57.77 a 12:16 9.35 0 12:16 JB2 JUNCTION 0.00 55.94 0 12: 16 7.52 0 12:16 JE20 JUNCTION 0.00 18.07 0 12: 15 0.00 JB21 JUNCTION 0.00
31.28 0 12:16 0.00 JB22 JUNCTION 0.00 33.97 a 12:16 0.00 JB3 JUNCTION 0.00 16.82 a 12: 15 0.39 a 12:15 JB4 JUNCTION 0.00 77.41 a 12:18 4.46 a 12:19 JB5 JUNCTION 0.00 29.44 a 12:20 0.00
JB6 JUNCTION 0.00 52.62 a 12:19 0.00 JB7 JUNCTION 0.00 23.42 a 12:17 0.00 JB8 JUNCTION 0.00 23.07 a 12:13 0.00 JB9 JUNCTION 0.00 9.87 0 12:15 0.00 Jun-l00 JUNCTION 3.64 7.26 a 12:26
0.00 Jun-101 JUNCTIUN 7.78 24.60 a 12: 17 0.00 -uun-l02-JUNCTION -7-,4-0-..-7-..45-a 12:40-·--0.00 Jun-l03 JONCTION 7.54 13.96 a 12:15 1.35 0 12:15 Jun-104 JUNCTION 6.41 6.41 a 12: 15
0.00 Jun-l05 JUNCTION 3.53 21.36 a 12:16 0.00 Jun-106 JUNCTION 2.02 18.97 a 12:15 0.00 Jun-l0a JUNCTION 3.67 17.32 a 12:15 0.84 a 12:16 Jun-109 JUNCTION 6.16 13.97 a 12:16 0.00 Jun-110
JUNCTION 7.85 7.85 a 12:15 0.18 a 12:15 Jun-lll JUNCTION 7.87 7.87 a 12:15 0.25 a 12:15 Jun-1l2 JUNCTION 2.09 15.33 a 12:13 0.00 Jun-1l3 JUNCTION 3.48 39.14 a 12:13 0.00 StormNET Page
48 f?
Jun-114 JUNCTION 2.81 12.67 a 12:15 0.00 Jun-115 JUNCTION 6.95 6.95 a 12:15 0.00 Jun-116 JUNCTION 2.93 2.93 a 12:15 0.00 Jun-117 JUNCTION 0.66 0.66 a 12:15 0.00 Jun-118 JUNCTION 5.29
44.31 a 12:13 0.00 Jun-119 JUNCTION 3.60 80.56 a 12:24 0.00 Jun-120 JUNCTION 3.89 83.77 a 12:25 0.00 Jun-121 JUNCTION 5.18 5.47 a 12:35 0.78 a 12:35 Jun-122 JUNCTION 0.92 0.92 a 12:10
0.00 Jun-123 JUNCTION 1.44 6.28 a 12:09 0.00 Jun-124 JUNCTION 0.86 7.09 a 12:09 0.00 Jun-125 JUNCTION 0.92 7.99 a 12:09 0.40 a 12:10 Jun-126 JUNCTION 2.15 9.93 a 12:15 0.00 Jun-127 JUNCTION
2.07 2.07 a 12:20 0.00 Jun-128 JUNCTION 2.99 2.99 a 12:35 0.41 a 12:35 Jun-129 JUNCTION 1.99 1. 99 a 12:15 0.00 Jun-130 JUNCTION 0.00 95.28 a 12:26 0.00 Jun-131 JUNCTION 0.00 52.02 a
12:23 2.56 a 12:23 Jun-132 JUNCTION 0.00 75.97 a 12:25 1. 66 a 12:19 Jun-134 JUNCTION 2.48 2.48 a 12:25 0.00 Jun-137 JUNCTION 0.86 0.86 a 12:15 0.00 Jun-139 JUNCTION 0.47 0.47 a 12 :20
0.00 Jun-140 JUNCTION 0.00 75.95 a 12:33 0.00 Jun-141 JUNCTION 0.00 97.71 a 12:48 0.00 Jun-62 JUNCTION 2.97 2.97 a 12:15 0.36 a 12:15 Jun-63 JUNCTION 1. 66 4.18 a 12:20 0.00 Jun-64 JUNCTION
4.85 8.64 a 12:15 1.01 a 12:15 Jun-65 JUNCTION 3.91 11.97 a 12:12 0.00 Jun-66 JUNCTION 3.71 15.56 a 12:12 0.00 Jun-67 JUNCTION 1.94 17.48 a 12:13 1.06 a 12:13 Jun-68 JUNCTION 5.22 24.04
a 12: 17 0.00 Jun-69 JUNCTION 2.83 2.83 a 12:35 0.24 a 12:35 Jun-70 JUNCTION 6.72 30.47 a 12:17 0.57 a 12:17 Jun-72 JUNCTION 5.56 5.56 a 12:15 0.00 Jun-73 JUNCTION 14.31 14.31 a 12:15
0.00 Jun-74 JUNCTION 2.53 2.53 a 12:10 0.00 Jun-75 JUNCTION 2.36 18.57 a 12:16 0.00 Jun-76 JUNCTION 3.77 20.63 a 12:16 0.00 Jun-77 JUNCTION 7.22 7.22 a 12:25 0.00 Jun-78 JUNCTION 4.19
11.18 a 12:25 0.00 Jun-79 JUNCTION 4.28 15.32 a 12:20 0.00 Jun-80 JUNCTION 1.90 1.90 a 12:20 0.00 Jun-81 JUNCTION 1. 65 3.53 a 12:15 0.00 Jun-82 JUNCTION 0.00 18.62 a 12:20 2.17 a 12:21
Jun-83 JUNCTION 8.81 26.17 a 12:27 0.00 Jun-84 JUNCTION 3.69 3.69 a 12:15 0.00 Jun-85 JUNCTION 5.66 5.66 a 12:15 0.97 a 12: 15 Jun-86 JUNCTION 3.48 11.55 a 12:14 0.00 Jun-87 JUNCTION
0.00 6.27 a 12:20 0.00 Jun-88 JUNCTION 4.48 4.48 a 12:20 0.00 Jun-89 JUNCTION 1. 95 1.95 a 12:25 0.00 Jun-90 JUNCTION 0.65 0.65 a 12:15 0.00 Jun-91 JUNCTION 5.71 28.12 a 12:15 0.00 Jun-92
JUNCTION 4.53 4.53 a 12:20 0.00 Jun-93 JUNCTION 2.84 2.84 a 12:15 0.26 a 12:15 Jun-94 JUNCTION 3.07 3.07 a 12:20 0.47 a 12:20 Jun-95 JUNCTION 23.90 23.90 a 12:20 0.00 Jun-96 JUNCTION
5.01 5.01 a 12:15 0.30 a 12:15 Jun-97 JUNCTION 3.52 3.52 a 12:25 0.93 a 12:25 Jun-98 JUNCTION 3.83 11.25 a 12:15 0.00 Jun--99 JUNCTION -3.81-3.81 a ---121-30 0-.00 OUt-37 OUTFALL 30.01
199.17 a 12:39 0.00 POND1 STORAGE 18.99 88.69 a 12:25 0.00 POND2 STORAGE 31. 72 168.48 a 12:25 0.00 ********************** Detention Pond Summary ********************** StormNET Page
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-----------------------------------------------------------------------------------Detention Pond ID Haximum Maximum Time of Max Average Average Maximum Maximum Time of Max. Total Ponded
Ponded Ponded Ponded Ponded Pond ExHltration Exfiltration Exfiltrated Volume Volume Volume Volume Volume Outflow Rate Rate Volume 1000 ft' (%) days hh:mm 1000 ft' (%) cis cfm hh:mm:ss
1000 ft' POND1 70.635 42 0 12:33 7.931 5 75.95 0.00 0:00:00 0.000 POND2 247.441 39 0 12:48 26.725 4 97.71 0.00 0:00:00 0.000 *********************** OUtfall Loading Summary ***********************
outfall Node ID Flow Average Peak Frequency Flow Inflow (% ) cfs cfs Out-37 96.32 24.1B 199.17 System 96.32 24.18 199.17 *********~******* Link Flow Summary ***************** Link In
Element Time of t-Iaximum Length Peak Flow Design Ratio of Ratio of Total Type Peak Flow Velocity Factor during Flow Maximum Maximum Time Occurrence Attained Analysis Capacity !Design
Flow Surcharged days hh:mm ft/sec cfs cis Flow Depth Minutes --------------------~---------------------------------------------------------------------------------------------12 CONDUIT
0 12:15 3.65 1.00 1.9B 2.5!l 0.77 0.66 0 15 CONDUIT 0 12:10 5.02 1.00 B.OB 7.62 1.06 1.00 0 Con-169 CONDUIT 0 12:18 3.B1 1.00 2.76 2.59 1.06 1.00 5 Con-170 CONDUIT 0 12:20 4.35 1.00
4.15 4.69 0.89 0.73 a Con-l71 CONDUIT 0 12:19 5.02 1.00 8.12 7.61 1.07 +;006 Con-l72 CONDun 0 12:12 5.75 1.00 11.92 16.44 0.73 0.63 0 Con-173 CONDUIT 0 12:13 5.94 1.00 15.54 16.36 0.95
0.78 0 Con-174 CONDUIT 0 12:17 6.08 1.00 17.14 16.40 1.05 0.93 0 Con-175 CONDUIT 0 12:35 3.84 1.00 2.73 2.59 1.05 0.94 0 Con-176 CONDUIT 0 12:17 6.78 1.00 23.83 29.72 0.80 0.68 0 StormNET
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Con-l7'7 CONDUIT o 12:18 7.05 1.00 31.08 29.77 1.04 0.92 o Con-178 CONDaIT o 12:18 7.52 1.00 35.91 48.56 0.74 0.64 o Con-119 CONDUIT o 12:16 8.05 1.00 52.29 48.35 1.08 0.97 o con-180
CONDUIT o 12:15 5.80 1.00 14 .30 16.14 0.S9 0.13 o Con-181 CONDUIT o 12:10 3.69 1.00 2.54 2.54 1.00 0.82 o Con-182 CONDUIT o 12:16 6.14 1.00 11.05 16.43 1.04 0.92 o Con-183 CONDUIT a
12:16 6.45 1.00 18.21 29.70 0.62 0.57 o Con-184 CONDUIT o 12:16 6.57 1. 00 20.53 29.86 0.69 0.61 o Con-185 CONDUIT o 12:15 4.70 1.00 5.53 1.59 0.13 0.63 o Con-186 CONDUIT a 12:25 4.91
1.00 7.20 7.63 0.94 0.78 o Con-187 CONDUIT o 12:25 5.64 1.00 11.18 16.49 0.66 0.60 o Con-ISS CONDUIT o 12:21 5.91 1.00 15.32 16.34 0.94 0.77 o Con-189 CONDUIT o 12:20 3.60 1.00 1.90
4.66 0.41 0.45 o Con-190 CONDUIT o 12:15 4.17 1.00 3.52 4.65 0.76 0.65 o con-191 CONDUIT o 12:27 6.09 1. 00 11.57 16.43 1.07 1.00 8 Con-192 CONDUIT o 12:25 8.81 1. 00 75.97 72.87 1.04
0.93 o Con-193 CONDUIT a 12:27 6.85 1.00 26.06 29.67 0.88 0.72 o Con-194 CONDUIT o 12:18 8.84 1.00 75.02 73.88 1.02 1. 00 a Con-195 CONDUIT o 12:16 4.46 1.00 4.92 4.70 1.05 0.93 o Con-196
CONDUIT o 12:40 3.83 1.00 2.78 2.59 1.07 1.00 23 Con-197 CONDUIT o 12:15 5.64 1.00 11.20 16.37 0.66 0.61 o Con-198 CONDOIT o 12:30 4.24 1.00 3.80 4.67 0.81 0.69 a Con-199 CONDUIT o 12:26
4.92 1.00 7.27 7.64 0.95 0.78 a con-200 CONDOIT o 12:18 6.79 1.00 24.55 29.78 0.62 0.69 o Con-201 CONDUIT o 12:21 7.17 1.00 29.43 72.80 0.40 0.44 o Con-202 CONDUIT o 12:40 4.96 1.00
7.45 7.73 0.96 0.79 o Con-203 CONDUIT o 12:19 8.27 1.00 52.54 73.07 0.72 0.63 o Con-204 CONDUIT o 12:15 4.B4 1.00 6.41 7.60 0.84 0.70 o Con-205 CONDUIT o 12: 13 4.67 1.00 13.29 12.58
1.06 1.00 2 Con-206 CONDUIT o 12:16 5.05 1.00 8.04 7.62 1.06 0.91 a Con-207 CONDUI-To 12:17 5.89 1.00 13.88 --16.39 0.85 0.70 o Con-208 CONDUIT o 12:15 6.03 1.00 16.98 16.45 1.03 0.93
a Con-209 CONDUIT o 12:15 6.42 1.00 18.95 29.73 0.64 0.58 o Con-210 CONDUIT o 12:16 6.62 1.00 21.35 29.90 0.71 0.63 a Con-211 CONDUIT o 12:17 6.70 1.00 23.41 29.65 0.79 0.67 o Con-212
CONDUIT o 12:25 3.96 1.00 2.47 4.83 0.51 StormNET Page 51
0.51 o Con-213 CONDUIT a 12:16 5.04 1.00 7.84 7.62 1.03 0.92 a Con-214 CONDUIT o 12:13 6.71 1. 00 23.06 29.64 0.77 0.66 o Con-215 CONDUIT o 12:13 5.99 1.00 15.31 16.52 0.93 0.76 o Con-216
CONDUIT a 12: 13 7.60 1.00 39.14 48.23 0.81 0.68 o con-217 CONDUIT o 12: 15 4.90 1.00 6.95 7.58 0.92 0.75 o Con-218 CONDUIT o 12:15 5.76 1.00 12.66 16.37 0.77 0.66 a Con-219 CONDUIT
o 12:15 5.32 1.00 0.66 12.26 0.05 0.16 o Con-22a CONDUIT a 12: 15 5.46 1.00 9.86 16.46 0.60 0.56 a Con-221 CONDUIT a 12:15 4.03 1.00 2.92 4.69 0.62 0.57 a Con-222 CONDUIT a 12:24 8.'77
1.00 77.25 73.02 1.06 1.00 15 Con-223 CONDUIT a 12:14 7.75 1.00 44.26 48.30 0.92 0.715 a Con-224 CONDUIT a 12:25 9.1'7 1.00 80.07 103.82 0.77 0.66 o Con-225 CONDUIT o 12:25 9.27 1.00
83.10 104.14 0.80 0.67 a Con-226 CONDUIT o 12:25 9.31 1.00 87.87 104.32 0.84 0.70 a Con-227 CONDUIT a 12: 26 9.43 1.00 95.28 104.32 0.91 0.75 a Con-228 CONDUIT o 12:10 3.02 1.00 0.92
2.59 0.35 0.41 o Con-229 CONDUIT o 12:27 4.40 1.00 5.05 4.69 1.06 1.00 15 Con-230 CONDUIT o 12: 42 3.63 1.00 2.76 2.58 1.07 1.00 14 Con-231 CONDUIT o 12 :15 4.35 1.00 4.40 4.68 0.94
0.77 o Con-232 CONDUIT o 12:32 4.45 1.00 5.05 4.71 1.07 1.00 22 Con-234 CONDUIT a 12:20 3.67 1.00 2.07 2.60 0.80 0.66 o Con-235 CONDUIT o 12:09 4.62 1.00 6.26 7.62 0.82 0.69 o con-236
CONDUIT o 12:09 4.90 1.00 7.10 7.63 0.93 0.76 o con-237 CONDUIT o 12:09 4.96 1.00 7.86 7.57 1.04 0.93 a Con-238, CONDUIT a 12:15 5.47 1.00 9.91 16.41 0.60 0.56 o Con-239 CONDUIT o 12:26
9.58 1.00 95.26 142.21 0.67 0.60 o Con-240 CONDUIT o 12:15 4.24 1.00 3.69 4.67 0.79 0.67 a Con-242 CONDUIT o 12:17 4.44 1.00 4.8a 4.69 1.04 1.00 9 Con-243 CONDUIT o 12:15 5.67 1.00 11.55
16.38 0.71 0.62 a Con-244 CONDUIT a 12:20 4.36 1.00 4.46 4.69 0.95 0;78-a Con-245 CONDUIT a 12:25 3.65 1.00 1.95 2.61 0.75 0.64 a Con-246 CONDUIT a 12:15 6.27 1. 00 17 .22 29.68 0.58
0.55 a Con-247 CONDUIT a 12:20 4.81 1.00 6.27 7.61 0.82 0.69 a con-248 CONDUIT o 12:16 6.41 1.00 18.66 29.81 0.63 0.57 o con-249 CONDUIT a 12:14 2.75 1.00 0.65 2.60 0.25 0.34 a StormNET
Page 52
-----------------------------12 ~ .. ' . .' .. ... ... .. .... ----APPENDIX D: Technical Design Summary -N:\Gessner Eng Data 09\09-0318 CSISD High\civil\Doc\Drainage Report-NRCS-high,doc
G Gessner Engineering
.. SECTION IX .. APPENDIX D -TECHNICAL DESIGN SUMMARY ... ..The Cities of Bryan and College Station both require storm drainage design to follow these Unified Stormwater Design Guidelines.
Paragraph C2 of Section III (Administration) requires .. submittal of a drainage report in support of the drainage plan (stormwater management plan) ..proposed in connection with land
development projects, both site projects and subdivisions. That report may be submitted as a traditional prose report, complete with applicable maps, .. graphs, tables and drawings,
or it may take the form of a "Technical Design Summary". The ..format and content for such a summary report shall be in substantial conformance with the description in this Appendix
to those Guidelines. In either format the report must answer the •questions (affirmative or negative) and provide, at minimum, the information prescribed in the "Technical Design Summary"
in this Appendix. • •The Stormwater Management Technical Design Summary Report shall include several parts as listed below. The information called for in each part must be provided as
applicable. In • addition to the requirements for the Executive Summary, this Appendix includes several •pages detailing the requirements for a Technical Design Summary Report as forms
to be completed. These are provided so that they may be copied and completed or scanned and • digitized. In addition, electronic versions of the report forms may be obtained from the
City. Requirements for the means (medium) of submittal are the same as for a conventional report • as detailed in Section III of these Guidelines. • Note: Part 1 -Executive Summary must
accompany any drainage report required to be provided in connection with any land development project, regardless of the format chosen for said report. Note: Parts 2 through 6 are to
be provided via the forms provided in this Appendix. Brief statements should be included in the forms as requested, but additional information should be attached as necessary. • • •---Part
1 -Executive Summary Report Part 2 -Project Administration Part 3 -Project Characteristics -Part 4 -Drainage Concept and Design Parameters -Part 5 -Plans and Specifications -Part 6 -Conclusions
and Attestation -STORMWATER MANAGEMENT TECHNICAL DESIGN SUMMARY REPORT Part 1 -Executive Summary This is to be a brief prose report that must address each of the seven areas listed below.
.. Ideally it will include one or more paragraphs about each item. .. 1. Name, address, and contact information of the engineer submitting the report, and ..of the land owner and developer
(or applicant if not the owner or developer). The date of submittal should also be included. .. 2. Identification of the size and general nature of the proposed project, including any
.. proposed project phases. This paragraph should also include reference to ..applications that are in process with either City: plat(s), site plans, zoning requests, .. STORMWATER DESIGN
GUIDELINES Page 1 of26 APPENDIX. D: TECH. DESIGN SUMMARY Effective February 2007 As Revised February 2009 .. .. .. ..
SECTION IX APPENDIX D -TECHNICAL DESIGN SUMMARY or clearing/grading permits, as well as reference to any application numbers or codes assigned by the City to such request. 3. The location
of the project should be described. This should identify the Named Regulatory Watershed(s) in which it is located, how the entire project area is situated therein, whether the property
straddles a watershed or basin divide, the approximate acreage in each basin, and whether its position in the Watershed dictates use of detention design. The approximate proportion of
the property in the city limits and within the ET J is to be identified, including whether the property straddles city jurisdictional lines. If any portion of the property is in floodplains
as described in Flood Insurance Rate Maps published by FEMA that should be disclosed. 4. The hydrologic characteristics of the property are to be described in broad terms: existing land
cover; how and where stormwater drains to and from neighboring properties; ponds or wetland areas that tend to detain or store stormwater; existing creeks, channels, and swales crossing
or serving the property; all existing drainage easements (or ROW) on the property, or on neighboring properties if they service runoff to or from the property. 5. The general plan for
managing stormwater in the entire project area must be outlined to include the approximate size, and extent of use, of any of the following features: storm drains coupled with streets;
detention I retention facilities; buried conveyance conduit independent of streets; swales or channels; bridges or culverts; outfalls to principal watercourses or their tributaries;
and treatment(s) of existing watercourses. Also, any plans for reclaiming land within
floodplain areas must be outlined. 6. Coordination and permitting of stormwater matters must be addressed. This is to include any specialized coordination that has occurred or is planned
with other entities (local, state, or federal). This may include agencies such as Brazos County government, the Brazos River Authority, the Texas A&M University System, the Texas Department
of Transportation, the Texas Commission for Environmental Quality, the US Army Corps of Engineers, the US Environmental Protection Agency, et al. Mention must be made of any permits,
agreements, or understandings that pertain to the project. 7. Reference is to be made to the full drainage report (or the Technical Design Summary Report) which the executive summary
represents. The principal elements of the main report (and its length), including any maps, drawings or construction documents, should be itemized. An example statement might be: "One
__-page drainage report dated one set of construction drawings ( sheets) dated , and a ___-page specifications document dated comprise the drainage report for this project. OJ STORMWATER
DESIGN GUIDELINES Page 2 of 26 APPENDIX. D: TECH. DESIGN SUMMARY Effective February 2007 As Revised February 2009
SECTION IX APPENDIX D -TECHNICAL DESIGN SUMMARY Part 2 Project Administration I Start (Page 2.1) Engineering and Design Professionals Information Engineering Firm Name and Address: Jurisdiction
Gessner Engineering City: Bryan 2501 Ashford Drive Suite 102 X College Station College Station, TX 77840 Date of Submittal: 12 16-2009 Lead Engineer's Name and Contact Info.(phone, e-mail,
fax): Other: Melissa P. Thomas, P.E. mthomas@ge.com Supporting Engineering I Consulting Firm(s): Other contacts: Developer I Owner I Applicant Information Developer I Applicant Name
and Address: Phone and e-mail: Jon Hall, College Station ISD 979-764-5400 1812 Welsh Av., Suite 120 jhall@csisd.orgCollege Station, TX 77840 Property Owner(s) if not Developer I Applicant
(& address): Phone and e-mail: Project Identification Development Name: CSISD High School Is subject property a site project, a single-phase subdivision, or part of a multi-phase subdivision?
Site Project If multi-phase, subject property is phase of Legal description of subject property (phase) or Project Area: (see Section II, Paragraph B-3a) A005401 -R. Stevenson (ICL)
, Tract 48.1 Vol. 3604, PG243 If subject property (phase) is second or later phase of a project, describe general status of all earlier phases. For most recent earlier phase Include
submittal and review dates. N/A General Location of Project Area, or subject property (phase): South corner of Barron Road and Victoria Avenue In City Limits? Extraterritorial Jurisdiction
(acreage): Bryan: 0 acres. Bryan: 0 College Station: 0 College Station: 63.665 acres. Acreage Outside ET J: 0 STORMWATER DESIGN GUIDELINES Page 3 of 26 APPENDIX. D: TECH. DESIGN SUMMARY
Effective February 2007 As Revised February 2009
SECTION IX APPENDIX D -TECHNICAL DESIGN SUMMARY Part 2 Project Administration I Continued (page 2.2) Project Identification (continued) Roadways abutting or within Project Area or Abutting
tracts, platted land, or built subject property: developments: Barron Road NW: Needham Estates Victoria Avenue NE: Reatta Meadows SE: Gary Seaback SW: Sonoma Named Regulatory Watercourse(s)
& Watershed(s): Tributary Basin(s): None Spring Creek Plat Infonnation For Project or Subject Property (or Phase) Preliminary Plat File #: NLA Final Plat File #: N/A Date: Name: Status
and Vol/Pg: If two plats, second name: File#: Status: Date: Zoning Information For Project or Subject Property (or Phase) Zoning Type: A-O Existing or Proposed? Existing Case Code: NLA
Case Date NLA Status: Zoning Type: Existing or Proposed? Case Code: Case Date Status: Stonnwater Management Planning For Project or Subject Property (or Phase) Planning Conference(s)
& Date(s): Participants: September 16, 2009 City of College Station SHW Group Gessner Engineering Preliminary Report Required? NQ Submittal Date Review Date Review Comments Addressed?
Yes N/A No In Writing? When?-Compliance With Preliminary Drainage Report. Briefly describe (or attach documentation explaining) any deviation(s) from provisions of Preliminary Drainage
Report, if any. N/A STORMWATER DESIGN GUIDELINES Page 4 of26 APPENDIX. D: TECH. DESIGN SUMMARY Effective February 2007 As Revised February 2009
SECTION IX APPENDIX D -TECHNICAL DESIGN SUMMARY Part 2 Project Administration I Continued (page 2.3) Coordination For Project or Subject Property (or Phase) Note: For any Coordination
of stonnwater matters indicated below, attach documentation describing and substantiating any agreements, understandings, contracts, or approvals. Coordination Dept. Contact: Date: Subject:
With Other N/A Departments of Jurisdiction City (Bryan or College Station) Coordination With Summarize need(s) & actions taken (include contacts & dates): Non-jurisdiction City Needed?
Yes No X-Coordination with Summarize need(s) & actions taken (include contacts & dates): Brazos County Needed? Yes No X-Coordination with Summarize need(s) & actions taken (include contacts
& dates): TxDOT Needed? Yes -No -1L Coordination with Summarize need(s) & actions taken (include contacts & dates): TAMUS Needed? Yes -No -1L Permits For Project or Subject Property
(or Phase) As to stormwater management, are permits required for the proposed work from any any of the entities listed below? If so, summarize status of efforts toward that objective
in spaces below. Entity Permitted or Approved? US Army Crops of Engineers No _X_ Yes US Environmental Protection Agency No --.X... Yes -Texas Commission on Notice of Environmental Quality
Intent No -Yes --.X... Brazos River Authority No _X_ Yes -To be Status of Actions (include dates) submitted by contractor • STORMWATER DESIGN GUIDELINES Page 50f26 APPENDIX. D: TECH.
DESIGN SUMMARY Effective February 2007 As Revised February 2009
SECTION IX APPENDIX D -TECHNICAL DESIGN SUMMARY Part 3 -Progertv Characteristics Start (Page 3.1)I Nature and Scope of Proposed Work Existing: Land proposed for development currently
used, including extent of impervious cover? Existing land undeveloped __Redevelopment of one platted lot, or two or more adjoining platted lots. Site Development __Building on a single
platted lot of undeveloped land. Project __Building on two or more platted adjoining lots of undeveloped land. (select all __Building on a single lot, or adjoining lots, where proposed
plat will not form applicable) a new street (but may include ROW dedication to existing streets). _X_ Other (explain): Building on a single unplatted lot of undeveloped land. NfA Construction
of streets and utilities to serve one or more platted lots. Subdivision Development __Construction of streets and utilities to serve one or more proposed lots on Project lands represented
by pending plats. Site projects: building use(s), approximate floor space, impervious cover ratio. Subdivisions: number of lots by general type of use, linear feet of streets and Describe
drainage easements or ROW. Nature and Size of Approximately 190,400 sq. ft High School, with Proposed a football stadium, baseball fields, tennis courts,Project track and associated
field buildings and parking. Is any work planned on land that is not platted If yes, explain: Platt to be submitted or on land for which platting is not pending? as as-built documents
after No Yes----X construction is complete FEMA Floodplains Is any part of subject property abutting a Named Regulatory Watercourse I N Y (Section II, Paragraph B1) or a tributary thereof?
0 --es-x-Is any part of subject property in floodplain Yes Rate Map area of a FEMA-regulated watercourse? I No -Encroachment{s) Encroachment purpose{s): __Building site{s) __Road crossing(s)
into Floodplain areas planned? __Utility crossing{s) __Other (explain): No --1LN/A Yes -If floodplain areas not shown on Rate Maps, has work been done toward amending the FEMA-approved
Flood Study to define allowable encroachments in proposed areas? Explain. STORMWATER DESIGN GUIDELINES Page 6 of26 APPENDIX. D: TECH. DESIGN SUMMARY Effective February 2007 As Revised
February 2009
SECTION IX APPENDIX D -TECHNICAL DESIGN SUMMARY Part 3 -Proeertv Characteristics I Continued (Page 3.2) Hydrologic Attributes of Subject Property (or Phase) Has an earlier hydrologic
analysis been done for larger area including subject property? Yes -Reference the study (& date) here. and attach copy if not already in City files. Is the stormwater management plan
for the property in substantial conformance with the earlier study? Yes No If not. explain how it differs. No -.L If subject property is not part of multi-phase project. describe stormwater
management plan for the property in Part 4. If property is part of multi-phase project. provide overview of stormwater management plan for Project Area here. In Part 4 describe how plan
for subject property will comply therewith. Do existing topographic features on subject property store or detain runoff? _X__ No --Yes Describe them (include approximate size. volume.
outfall, model, etc). Any known drainage or flooding problems in areas near subject property? _X_ No -Yes Identify: Based on location of study property in a watershed. is Type 1 Detention
(flood control) needed? (see Table B-1 in Appendix B) _X_ Detention is required. --Need must be evaluated. __Detention not required. What decision has been reached? By whom? If the need
for How was determination made? Type 1 Detention must be evaluated: STORMWATER DESIGN GUIDELINES Page 7 of26 APPENDIX. D: TECH. DESIGN SUMMARY Effective February 2007 As Revised February
2009
SECTION IX APPENDIX D -TECHNICAL DESIGN SUMMARY Part 3 -Property Characteristics I Continued (Page 3.3) ! Hydrologic Attributes of Subject Property (or Phase) (continued) · Does subject
property straddle a Watershed or Basin divide? _X_ No __Yes If yes, I describe splits below. In Part 4 describe design concept for handling this. i Watershed or Basin Larger acreage
Lesser acreage Spring Creek 63.665 ~..-------------------------------------r------------1-----------~ Above-Project Areas(Section II, Paragraph B3-a) Does Project Area (project or phase)
receive runoff from upland areas? --L No __ Yes Size(s) of area(s) in acres: 1) 2) 3) 4) Flow Characteristics (each instance) (overland sheet, shallow concentrated, recognizable concentrated
section(s), small creek (non-regulatory), regulatory Watercourse or tributary); Flow determination: Outline hydrologic methods and assumptions: Does storm runoff drain from public easements
or ROW onto or across subject property? , _X_ No __ Yes If yes, describe facilities in in easement or ROW: Are changes in runoff characteristics subject to change in future? Explain
Conveyance Pathways (Section II, Paragraph C2) I Must runoff from study property drain across lower properties before reaching a Regulatory I Watercourse or tributary? X No Yes Describe
length and characteristics of each conveyance pathway(s). Include ownership of property(ies). N/A STORMWATER DESIGN GUIDELINES Page 8of26 APPENDIX. D: TECH. DESIGN SUMMARY Effective
February 2007 As Revised February 2009 I
SECTION IX APPENDIX D -TECHNICAL DESIGN SUMMARY Part 3 -ProRertv Characteristics 1 Continued (Page 3.4) Hydrologic Attributes of Subject Property (or Phase) (continued) Conveyance Pathways
(continued) i Do drainage easements exist for any part of pathway{s)? -No N/A Yes-If yes, for what part of length? % Created by? __plat. or __instrument. If instrument{s}. describe their
provisions. Pathway Areas Where runoff must cross lower properties, describe characteristics of abutting lower property{ies). (Existing watercourses? Easement or Consent aquired?) N/A
Nearby Drainage Facilities Describe any built or improved drainage facilities existing near the property (culverts. bridges, lined channels. buried conduit, swales, detention ponds,
etc). Culvert beneath Barron Drive to drainage swale south of subject property. Do any of these have hydrologic or hydraulic influence on proposed stormwater design? _X_ No --Yes If
yes. explain: STORMWATER DESIGN GUIDELINES Page 90f26 APPENDIX. D: TECH. DESIGN SUMMARY Effective February 2007 As Revised February 2009
----SECTION IX APPENDIX D -TECHNICAL DESIGN SUMMARY Part 4 -Drainage Conceet and Design Parameters Start (Page 4.1) I Stormwater Management Concept Discharge{s) From Upland Area{s) If
runoff is to be received from upland areas, what design drainage features will be used to accommodate it and insure it is not blocked by future development? Describe for each area, flow
section, or discharge point. N/A Discharge{s) To Lower Property(ies) (Section II, Paragraph E1) Does project include drainage features (existing or future) proposed to become public
via platting? -2L..No Yes Separate Instrument? No Yes Per Guidelines reference above, how will __ Establishing Easements (Scenario 1)runoff be discharged to neighboring __ Pre-development
Release (Scenario 2) property(ies) ? N/A Combination of the two Scenarios Scenario 1: If easements are proposed, describe where needed, and provide status of actions on each. (Attached
Exhibit # ) N/A Scenario 2: Provide general description of how release(s) will be managed to pre-development conditions (detention, sheet flow, partially concentrated, etc.). (Attached
Exhibit # ) N/A Qombination: If combination is proposed, explain how discharge will differ from pre-development conditions at the property line for each area (or point) of release. N/A
If Scenario 2. or Qombination are to be used, has proposed design been coordinated with owner(s) of receiving property(ies}? No Yes Explain and provide documentation. N/A STORMWATER
DESIGN GUIDELINES Page 10 of26 APPENDIX. D: TECH. DESIGN SUMMARY Effective February 2007 As Revised February 2009
i SECTION IX APPENDIX D -TECHNICAL DESIGN SUMMARY Part 4 -Drainage Conceet and Design Parameters IContinued (Page 4.2) Stormwater Management Concept (continued) • Within Project Area
Of Multi-Phase Project Identify gaining Basins or Watersheds and acres shifting: Will project result N/Ain shifting runoff between Basins or between What design and mitigation is used
to compensate for increased runoff Watersheds? from gaining basin or watershed? _X_ No --Yes How will runoff from Project 1. __With facility{ies} involving other development projects.
Area be mitigated to pre-development conditions? 2. __Establishing features to serve overall Project Area. Select any or all of 1, 2, 3. _X_ On phase (or site) project basis within Project
Area. and/or 3, and explain below. 1. Shared facility (type & location of facility; design drainage area served; relationship to size of Project Area): (Attached Exhibit # ) N/A 2. For
Overall Project Area (type & location of facilities): (Attached Exhibit # ) N/A 3. By phase (or site) project: Describe planned mitigation measures for phases (or sites) in subsequent
questions of this Part. ('-. "0 (\) <IIc: (\) c: >..m 0<II c: C> 'iii (\) 0Oz 11(\)... « Are aquatic echosystems proposed? --LNo --Yes In which phase{s) or project(s)? Are other Best
Management Practices for reducing stormwater pollutants proposed? No _X_ Yes Summarize type of BMP and extent of use:--Silt fencing at limits of construction -Inlet protection -Sedimentation
Pond -Sad of landscaping in all disturbed areas -Construction Entrance If design of any runoff-handling facilities deviate from provisions of B-CS Technical Specifications, check type
facility{ies) and explain in later questions. -Detention elements --Conduit elements --Channel features Swales Ditches Inlets __Valley gutters __ Outfalls----Culvert features __Bridges
Other STORMWATER DESIGN GUIDELINES Page 11 of26 APPENDIX. D: TECH. DESIGN SUMMARY Effective February 2007 As Revised February 2009
SECTION IX APPENDIX D -TECHNICAL DESIGN SUMMARY Part 4 -Drainage Concept and Design Parameters IContinued (Page 4.3) Stormwater Management Concept (continued) Within Project Area Of
Multi-Phase Project (continued) Will Project Area include bridge(s) or culvert(s)? :x general size and In which phase(s). No Yes Identify type and If detentionlretention serves (will
serve) overall Project Area, describe how it relates to subject • phase or site project (physical location, conveyance pathway(s), construction sequence): 2 detention ponds will be located
at the Southeast end of the subject site. I Within Or Serving Subject Property (Phase, or Site) If property part of larger Project Area, is design in substantial conformance with earlier
analysis and report for larger area? __Yes No, then summarize the difference(s): N/A Identify whether each of the types of drainage features listed below are included, extent of use,
and general characteristics. Typical shape? I Surfaces? ! Steepest side slopes: Usual front slopes: Usual back slopes: Flow line slopes: least.____ Typical distance from travelway: typical
greatest.____ (Attached Exhibit # ) Are longitudinal culvert ends in compliance with 8-CS Standard Specifications? ___ Yes No, then explain: At intersections or otherwise, do valley
gutters cross arterial or collector streets? ___ No __Yes If yes explain: Are valley gutters proposed to cross any street away from an intersection? __ No __ Yes Explain: (number of
locations?) STORMWATER DESIGN GUIDELINES Page 12 of 26 APPENDIX. D: TECH. DESIGN SUMMARY Effective February 2007 As Revised February 2009
--SECTION IX APPENDIX D -TECHNICAL DESIGN SUMMARY Part 4 -Drainage Concept and Design Parameters Continued (Page 4.4) Stonnwater Management Concept (continued) Within Or Serving Subject
Property (Phase, or Site) (continued) Gutter line slopes: Least Usual Greatest Are inlets recessed on arterial and collector streets? --Yes --No If "no", identify where and why. Will
inlets capture 10-year design stormflow to prevent flooding of intersections (arterial with arterial or collector)? -Yes -No If no, explain where and why not. ('0. 'C CI) (fl Will inlet
size and placement prevent exceeding allowable water spread for 10-year ::J 0 .... z design storm throughout site (or phase)? Yes No If no, explain. ~ --::J Cl 'C -c'C III CI) Sag curves:
Are inlets placed at low points? Yes No Are inlets and .c~ --....conduit sized to prevent 1 OO-year stormflow from ponding at greater than 24 inches? ::J ..... (J C Yes No Explain "no"
answers. 0.s::. (J --:!::' ........., ~ (fl..... CI) I!:! iii I!:! Will 1 OO-yr stormflow be contained in combination of ROWand buried conduit on « whole length of all streets? Yes No
If no, describe where and why. --j Do designs for curb, gutter, and inlets comply with 8-CS Technical Specifications? Yes -No If not, describe difference(s) and attach justification.
Are any 12-inch laterals used? __ No X Yes Identify length(s) and where -used. ref. sheet CS.O ('0. 'C j Pipe runs between system CI)(fl ITypical 170 ft Longest 332 ft (flCl) access
pOints (feet):::J)E Are junction boxes used at each bend? --Yes X No If not, explain where ~>4\ and why. (fl .!: 0 Not used where access is located near the bend. e!z 'C E.... 0 Least
amount that hydraulic I Are downstream soffits at or below upstream soffits? iii grade line is below gutter line Yes --X-No __ If not, explain where and why: .E!. (system-wide): STORMWATER
DESIGN GUIDELINES Page 13 of26 APPENDIX. D: TECH. DESIGN SUMMARY Effective February 2007 As Revised February 2009 I
--SECTION IX APPENDIX D -TECHNICAL DESIGN SUMMARY II:), A 1:\Part 4 -Drainage ConceRt and Design Parameters I Continu -\. -Stonnwater Management Concept (continued) Within Or Serving
Subject Property (Phase, or Site) (continued) -Describe watercourse(s), or system(s) receiving system discharge(s) below (/) (include design discharge velocity, and angle between converging
flow lines). iV 0 c: 1) Watercourse (or system), velocity, and angle? .!l (/) 1. Spring Creek TributarYI velocity= 6.7 cfs.5 ~ angle= 90 degrees-0 2) Watercourse (or system), velocity,
and angle? ~E :::J .... 1. Spring Creek TributarYI velocity=9.0 cfs.5.2 c: . -0.2 angle= 90 degreeso c:_.(/)E iV -::::"iV E 3) Watercourse (or system), velocity, and angle? -tU (/) (/)
~ :::J~iV 0c::9 .-> ,---"-.--» . --"'."E e -.~".-."Co. -ur of~IIabove, what measures are taken to prevenf erosic EQj .... iV r ving and all facilities at juncture? .9.c: )Cf)(/) iV 1)
Riprap to centerline of creek tributary/~tU -.... tU 0. 2) Riprap to centerline of creek tributariV (/) c:0 3)~ " ...................-.,-r-. ,__ ." ~p"'" n~_" Are swale(s) situated along
property lines between properties? __No --Yes Number of instances: For each instance answer the following questions. Surface treatments (including low-flow flumes if any): N/A('0. (/)Qj
~(/)1ijiV Flow line slopes (minimum and maximum): (I.s "Co ~z Outfall characteristics for each (velocity, convergent angle, & end treatment). :::J ~1(/) « ~ Will 1 DO-year design storm
runoff be contained within easement(s) or platted drainage ROW in all instances? --Yes No If "no" explain: Page 14 of26 APPENDIX. D: TECH. DESIGN SUMMARY Effective February 2007 As Revised
February 2009
SECTION IX APPENDIX D -TECHNICAL DESIGN SUMMARY Part 4 -Drainage Concept and Design Parameters IContinued (Page 4.6) Stormwater Management Concept (continued) Within Or Serving Subject
Property (Phase, or Site) (continued) UJ <I.l .s::: ,g o <I.l "C 'iii "C «I o 0:: Are roadside ditches used? _X_ No Yes If so, provide the following: __ Is 25-year flow contained with
6 inches of freeboard throughout? __ Yes __ No Are top of banks separated from road shoulders 2 feet or more? __Yes __ No Are all ditch sections trapezoidal and at least 1.5 feet deep?
Yes No For any "no" answers provide location(s) and explain: If conduit is beneath a swale, provide the following information (each instance). Instance 1 Describe general location, approximate
length: UJ <I.l>-I Is 1 DD-year design flow contained in conduitlswale combination? __Yes __ No t ~ If "no" explain: e: o «I I ;S~pa~ce~f~0~r~1~DD~-2y~e=ar~s~t~or~m~flo~w~?~R;O~VV~==~~E~a~s~e~m~e~n~t
====~~VV~i~d~th~======~~z iii l-e: Swale Surface type, minimum Conduit Type and size, minimum and maximum :><\ ~ and maximum slopes: slopes, design storm: o E ~"C a; ~ Inlets Describe
how conduit is loaded (from streets/storm drains, inlets by type): e: >-:fij e: ~ i I ~ 5 '-IA-::-c-c-e-s-s--=D':'"e-s-cr"7:ibC-e-h':'"o-w-m-a"7in-:t-e-na-n-c-e-a-c-c-e-ss-:-is-p-ro-v-:id"7e-d-:-:':"
(to-s-w-a':"'le-,-:-in"7to-co-n-d-::-u"7it:-:-):-----i ~16 ~ E Jg-e.5 ~---~~----~~------~-~------------i.5 <I.l Instance 2 Describe general location, approximate length: "C E <I.l «I
~ UJ UJ <I.l ~------__------------------~-------i e:"C Is 1 DD-year design flow contained in conduitlswale combination? __ Yes __ No o .... If "no" explain: ~ 16e: c. ~ ID ~--------------------------
-------i E <I.l Space for 1 DD-year storm flow? ROVV Easement VVidth 8 ~ •Swale Surface type, minimum Conduit Type and size, minimum and maximum ~ ~ ! and maximum slopes: slopes, design
storm: ~ ~ i Inlets Describe how conduit is loaded (from streets/storm drains, inlets by type): ~~ UJ <I.l... Access Describe how maintenance access access IS provided (to swale, Into
conduit) . « STORMVVATER DESIGN GUIDELINES Page 15 of 26 APPENDIX. D: TECH. DESIGN SUMMARY Effective February 2007 As Revised February 2009
SECTION IX APPENDIX D -TECHNICAL DESIGN SUMMARY Part 4 -Drainage Concept and Design Parameters I Continued (Page 4,7) Stormwater Management Concept (continued) Within Or Serving Subject
Property (Phase, or Site) (continued) . If "yes" provide the following information for each instance: Instance 1 Describe general location, approximate length, surfacing: c: 'iii E is..
x o W -I:: Is 1 DO-year design flow contained in swale? -LYes __ No Is swale wholly 15 m within drainage ROW? __Yes __ No Explain "no" answers: 2 ~I ,~ ~ ~----~~~~~--~~----------~--~-----------------
-----~ (.) Access Describe how maintenance access is provide: ~ 0;z]~I ~~--~~=---~----~~~------~--~--~--~~------------~ .., Instance 2 Describe general location, approximate length,
surfacing: ~ ';:: ('.. ::J J!! ..0 c: ~-g E .r::. ~ Is 1DO-year design flow contained in swale? __ Yes __ No Is swale wholly m '-~ j gj within drainage ROW? __Yes __No Explain "no" answers:
..!!:! 0 ~Smo Access Describe how maintenance access is provided: :> .2 sO::: :c ::J a. Instance 3, 4, etc. If swales are used in more than two instances, attach sheet providing all
above information for each instance. "New" channels: Will any area(s) of concentrated flow be channelized (deepened, widened, or straightened) or otherwise altered? __ No __ Yes If only
slightly shaped, see "Swales" in this Part. If creating side banks, provide information below. ('.. "0 c:: Will design replicate natural channel? __ Yes __No If "no", for each instance
~ m 1'0 describe section shape & area, flow line slope (min. & max.), surfaces, and 100-year o a. a. o x design flow, and amount of freeboard: .... W a. Instance 1:mJ!! ~ c: ~ >E ~ Instance
2:~ Ia. 0.§ z "ii ~Ic: Instance 3:c: 1'0 .r::. () STORMWATER DESIGN GUIDELINES Page 16 of 26 APPENDIX. D: TECH. DESIGN SUMMARY Effective February 2007 As Revised February 2009 I
------SECTION IX APPENDIX D -TECHNICAL DESIGN SUMMARY Part 4 -Drainage Conce~t and Design Parameters IContinued (Page 4.8) Stormwater Management Concept (continued) Within Or Serving
Subject Property (Phase, or Site) (continued) Existing channels 'small creeks}: Are these used? No Yes If ·yes· provide the information below. Will small creeks and their floodplains
remain undisturbed? __ Yes No How many disturbance instances? Identify each planned location: For each location, describe length and general type of proposed improvement (including floodplain
changes): For each location, describe section shape &area, flow line slope (min. &max.), surfaces, and 1 a a-year design flow. -"C Q) ::J c: ::;;; Watercourses (and tributaries): Aside
from fringe changes, are Regulatory c: 0 () Watercourses proposed to be altered? __No Yes Explain below. -(/) Submit full report describing proposed changes to Regulatory Watercourses.
Address1: Q) existing and proposed section size and shape, surfaces, alignment, flow line changes, E Q) length affected, and capacity, and provide full documentation of analysis procedures
>e 0and data. Is full report submitted? Yes -No If "no" explain: .§ Q) c: c: I\) ..c:: U . All Proposed Channel Work: , requested in next three boxes. For all proposed channel work,
provide information If design is to replicate natural channel, identify location and length here, and describe design in Special Design section of this Part of Report. ,::r:: "Z i Will
1 OO-year flow be contained with one foot of freeboard? -Yes -No If not, identify location and explain: Are ROW I easements sized to contain channel and required maintenance space? -Yes
-No If not, identify location(s) and explain: STORMWATER DESIGN GUIDELINES Page 17 of26 APPENDIX, D: TECH. DESIGN SUMMARY Effective February 2007 As Revised February 2009
SECTION IX APPENDIX D -TECHNICAL DESIGN SUMMARY Part 4 -Drainage Concept and Design Parameters IContinued (Page 4.9) Storrnwater Management Concept (continued) Within Or Serving Subject
Property (Phase, or Site) (continued) o z I How many facilities for subject property project? 2 For each provide info. below. For each dry-type facilitiy: Facility 1 Facility 2 Acres
served & design volume + 10% 18.9 14.6 ac-ft 26.0 16.2 ac-ft 1OO-yr volume: free flow & plugged 1. 9 1 2 . 45 ac-ft 5.49 ac ft 7.14 ac-ft Design discharge (10 yr & 25 yr) 54 7 cfs 1
64.3 cfs 44.8 cfs 52.0 cfs -Lyes -no _X__ yesSpillway crest at 1 OO-yr WSE? -Lyes --no _X__ yesBerms 6 inches above plugged WSE? Explain any "no" answers: For each facility what is 25-yr
design Q, and design of outlet structure? Facility 1: See detail sheet C5.1, 64.3 cfs Facility 2: See detail sheet C5. 5, 52.0 cfs Do outlets and spillways discharge into a public facility
in easement or ROW? Facility 1: __ Yes ~No Facility 2: __ Yes ~No --If "no" explain: Discharges Discharges into tributary to Spring Creek For each, what is velocity of 25-yr design discharge
at outlet? &at spillway? Facility 1: 4.0 cfs & 0 Facility 2: 5.0 cfs & n no no Are energy dissipation measures used? __No -2L Yes Describe type and location: Dissipator blocks and riprap
at each outlet For each, is spillway surface treatment other than concrete? Yes or no, and describe: Facility 1: No Facility 2: No For each, what measures are taken to prevent erosion
or scour at receiving facility? Facility 1: Dissipator blocks and riprap at outfalls Facility 2: Dissipg.te'L--nlocks.~nd riprap at outfalls "~., . If berms ar~ed give heights, slopes
and SUrfaceayrents 0 sides. Facility y r 5 ft, Max 3: 1, grass /Fa~ty 2: 6 ft, Max 3: 1, grass i STORMWATER DESIGN'OOiOELlNEa .. ----rs-age 18 of26 Effective February 2007 , APPENDIX,
D: TECH. DESIGN SUMMARY As Revised February 2009 7
1 SECTION IX APPENDIX D -TECHNICAL DESIGN SUMMARY Part 4 -Drainage Conce~t and Design Parameters IContinued (Page 4.10) Stormwater Management Concept (continued) Within Or Serving Subject
Property (Phase, or Site) (continued) I Do structures comply with B-CS Specifications? Yes or no, and explain if "no": fII Facility 1; Yes ~ := ...-.., '0 -g Facility 2:(U :J YesLLc:
.._" ...c: ..~oE .' +=0 .....-',.""-.~-'" c: 0 Q) '-' j;.9f1idditional facilities provide all same information on a separate sheet. ');;l( Are parking areas to be used for detention?
_X_ No -~maximum depth due to required design storm? ""..Roadside Ditches: Will culverts serve acgiS$~at roadside ditches? ---=:'l'l~"'--Yes'''''If}1e'S-; prOvideTnformation in next
two boxes. Will 25-yr. flow pass without flowing over driveway in all cases? -Yes -No Without causing flowing or standing water on public roadway? -Yes -No Designs & materials comply
with B-CS Technical Specifications? __ Yes -No Explain any "no" answers: ".III tn c: 'iii Are culverts parallel to public roadway alignment? __Yes No Explain: III 0 -... III o Q) !!l>(U
I>';':;; Creeks at Private Drives: Do private driveways, drives, or streets cross drainage Co iii ways that serve Above-Project areas or are in public easementsl ROW? "0 0 No Yes If
"yes· provide information below, Q)Z ~~I How many instances? Describe location and provide information below, Q) Location 1:>"50 Q) Location 2:... « Location 3: For each location enter
value for: 1 2 3 Design year passing without toping travelway? Water depth on travelway at 25-year flow? Water depth on travelway at 1 OO-year flow? For more instances describe location
and same information on separate sheet. STORMWATER DESIGN GUIDELINES Page 19 of 26 APPENDIX, D: TECH. DESIGN SUMMARY Effective February 2007 As Revised February 2009 ,I
SECTION IX APPENDIX D -TECHNICAL DESIGN SUMMARY Part 4 -Drainage Concel}t and Design Parameters I Continued (Page 4.11) Stonnwater Management Concept (continued) Within Or Serving Subject
Property (Phase, or Site) (continued) Named RegulatolY Watercourses ,& Tributaries}: Are culverts proposed on these facilities? No __Yes, then provide full report documenting assumptions,
criteria, analysis, computer programs, and study findings that support proposed design(s). Is report provided? __Yes -No If "no', explain: -Arterial or Major Collector Streets: Will
culverts serve these types of roadways? 'i) <0 No Yes How many instances? For each identify the .r:. III --<0 location and provide the information below. III iii Instance 1:<0 ... >-[I:
Instance 2: Instance 3: c:: 0 o iii Yes or No for the 100-year design flow: 1 2 3 ZE ~I~ Headwater WSE 1 foot below lowest curb top? Spread of headwater within ROW or easement? E ('0.
«I Is velocity limited per conditions (Table C-11)? 111111 ~-o Explain any "no" answer(s): .c::::l «I o c:: ... 0 (.):;:::::; »«1 ~~ -0<0 «1..0fh:: Minor Collector or Local Streets:
Will culverts serve these types of streets? (.)(.) No Yes How many instances? for each identify the ._ III ---<0.g-o location and provide the information below: 0.<0_0. Instance 1:«Ii!:'
-0» Instance 2:<oc::111«1 ::::l_ Instance 3:III 0 till <0 <0 For each instance enter value, or "yes" /"no" for: 3~(.) 1 2::::l c:: (.) «I Design yr. headwater WSE 1 ft. below curb top?
<ow ... c:: i 100-yr. max, depth at street crown 2 feet or less? ~ .<0... 0 Product of velocity (fps) & depth at crown (ft) =?E ... $:! Is velocity limited per conditions (Table C-11)?
'-" Limit of down stream analysis (feet)? Explain any "no" answers: STORMWATER DESIGN GUIDELINES Page 20 of 26 APPENDIX. D: TECH. DESIGN SUMMARY Effective February 2007 As Revised February
2009
--------SECTION IX APPENDIX D -TECHNICAL DESIGN SUMMARY Part 4 -Drainage Conce~t and Design Parameters IContinued (Page 4.12) Stormwater Management Concept (continued) Within Or Serving
Subject Property (Phase, or Site) (continued) All Proposed Culverts: For all proposed culvert facilities (except driveway/roadside ditch intersects) provide information requested in
next eight boxes. Do culverts and travelways intersect at 90 degrees? Yes No If not, identify location(s) and intersect angle(s), and justify the design(s): Does drainage way alignment
change within or near limits of culvert and surfaced approaches thereto? __ No --Yes If "yes" identify location(s), describe change(s}, and justification: Are flumes or conduit to discharge
into culvert barrel(s)? __No __ Yes If yes, identify location(s} and provide justification: Are flumes or conduit to discharge into or near surfaced approaches to culvert ends? :c--No
--Yes If "yes" identify location(s}, describe outfall design treatment(s): Q.) :::J t: :;::; t: t: 0 U-Ul t: Q.) :> Is scour/erosion protection provided to ensure long term stability
of culvert structural "5 components, and surfacing at culvert ends? __Yes __ No If "no" Identify locations and provide justification(s): 0 ~ 'Z Will 1OO-yr flow and spread of backwater
be fully contained in street ROW, and/or drainage easementsl ROW? __Yes --No if not, why not? Do appreciable hydraulic effects of any culvert extend downstream or upstream to neighboring
land(s) not encompassed in subject property? --No Yes If "yes" describe location(s) and mitigation measures: Are all culvert designs and materials in compliance with B-CS Tech. Specifications?
--Yes No If not, explain in Special Design Section of this Part. STORMWATER DESIGN GUIDELINES Page 21 of26 APPENDIX. D: TECH. DESIGN SUMMARY Effective February 2007 As Revised February
2009 I
SECTION IX APPENDIX D -TECHNICAL DESIGN SUMMARY Part 4 -Drainage ConceDt and Design Parameters IContinued (Page 4.13) Stormwater Management Concept (continued) Within Or Serving Subject
Property (Phase, or Site) (continued) Is a bridge included in plans for subject property project? ---1L No --Ves 1& vide the following information. Name{s) and functional classification
of the roadway{s)? What drainage way{s) is to be crossed? fi) or C) "0.;:: co A full report supporting all aspects of the proposed bridge{s) (structural, geotechnical, hydrologic, and
hydraulic factors) must accompany this summary report. Is the report provided? --Ves -No If "no· explain: Is a Stormwater Provide a general description of planned techniques: ~ Pollution
Prevention Silt fencing "ffi Plan (SW3P) Inlet Protection:::J 0 established for "project construction? Stabilized construction entranceCI.l ~ No Ves Sod or landscape at all disturbed
areas-Sedimentation Pond Special Designs -Non-Traditional Methods Are any non-traditional methods (aquatic echosystems, wetland-type detention, natural stream replication, BMPs for water
quality, etc.) proposed for any aspect of subject property project? ~No --Ves If "yes" list general type and location below. Provide full report about the proposed special design{s)
including rationale for use and expected benefits. Report must substantiate that stormwater management objectives will not be compromised, and that maintenance cost will not exceed those
of traditional design solution(s). Is report provided? Ves---No If "no" explain: STORMWATER DESIGN GUIDELINES Page 22 of 26 APPENDIX. D: TECH. DESIGN SUMMARY Effective February 2007
As Revised February 2009
------SECTION IX APPENDIX D -TECHNICAL DESIGN SUMMARY Part 4 -Drainage ConceRt and Design Parameters IContinued (Page 4.14) Stormwater Management Concept (continued) Within Or Serving
Subject Property (Phase, or Site) (continued) Special Designs -Deviation From B-CS Technical Specifications If any design(s) or material(s) of traditional runoff-handling facilities
deviate from provisions of B-CS Technical Specifications, check type facility(ies) and explain by specific detail element. Detention elements _X_ Drain system elements Channel features
--Culvert features Swales --Ditches --Inlets --Outfalls __Valley gutters __Bridges (explain in bridge report) • In table below briefly identify specific element, justification for deviation(s).
Specific Detail Element Justification for Deviation (attach additional sheets if needed) 1) HDPE pipe Only in private development 2) 3) 4) 5) Have elements been coordinated with the
City Engineer or her/his designee? For each item above provide "yes" or "no", action date, and staff name: 1) Yes, Carol Cotter 2) 3) 4) 5) Design Parameters Hydrology Is a map(s) showing
all Design Drainage Areas provided? _X_ Yes --No Briefly summarize the range of applications made of the Rational Formula: Rational Formula not used. Calculations in accordance with
USDA TR-55 What is the size and location of largest Design Drainage Area to which the Rational Formula has been applied? 0 acres Location (or identifier): STORMWATER DESIGN GUIDELINES
Page 23 of26 APPENDIX. D: TECH. DESIGN SUMMARY Effective February 2007 As Revised February 2009
SECTION IX APPENDIX D -TECHNICAL DESIGN SUMMARY I Part 4 -Drainage Concegt and Design Parameters IContinued (Page 4.15) Design Parameters (continued) Hydrology (continued) In making
determinations for time of concentration, was segment analysis used? No ~Yes In approximately what percent of Design Drainage Areas? % As to intensity-duration-frequency and rain depth
criteria for determining runoff flows, were any criteria other than those provided in these Guidelines used? _X_ No __Yes If "yes" • identify type of data, source(s}, and where applied:
For each of the stormwater management features listed below identify the storm return frequencies (year) analyzed (or checked), and that used as the basis for design. Feature Analysis
Year(s} Design Year Storm drain system for arterial and collector streets N/A N/A Storm drain system for local streets N/A N/A Open channels N/A N/A Swale/buried conduit combination
in lieu of channel N/A N/A Swales N/A N/A i Roadside ditches and culverts serving them N/A N/A Detention facilities: spillway crest and its outfall 2,10,25,50,100 100 Detention facilities:
outlet and conveyance structure(s) 2,10,25,50,100 2 • Detention facilities: volume when outlet plugged 2,10,25,50,100 100 • Culverts serving private drives or streets N/A N/A Culverts
serving public roadways N/A N/A Bridges: provide in bridge report. N/A N/A Hydraulics What is the range of design flow velocities as outlined below? Design flow velocities; Gutters Conduit
Culverts Swales Channels I Highest (feet per second) N/A 9.58 I N/A N/A N/A Lowest (feet per second) N/A 2.33 N/A N/A N/A Streets and Storm Drain Systems Provide the summary information
outlined below: Roughness coefficients used: For street gutters: NLA For conduit type(s} HDPE l2i l2e Coefficients: O. 015 STORMWATER DESIGN GUIDELINES Page 24 of 26 APPENDIX. D: TECH.
DESIGN SUMMARY Effective February 2007 As Revised Februarv 2009
--------SECTION IX APPENDIX D -TECHNICAL DESIGN SUMMARY Part 4 -Drainage Conce~t and Design Parameters IContinued (Page 4.16) Design Parameters (continued) Hydraulics (continued) Street
and Storm Drain Systems (continued) For the following, are assumptions other than allowable per Guidelines? Inlet coefficients? -X-No --Yes Head and friction losses ---L No Yes Explain
any "yes" answer: i In conduit is velocity generally increased in the downstream direction? ---L Yes --No Are elevation drops provided at inlets, manholes, and junction boxes? -1L Yes
No Explain any "no" answers: Are hydraulic grade lines calculated and shown for design storm? ---L Yes No For 1 OO-year flow conditions? -.JL Yes No Explain any "no" answers: What tailwater
conditions were assumed at outfall point(s) of the storm drain system? Identify each location and explain: Free outfall Open Channels If a HEC analysiS is utilized, does it follow Sec
VI.F.5.a? NLA Yes __ No I Outside of straight sections, is flow regime within limits of sub-critical flow? __ Yes __ No If "no" list locations and explain: N/A Culverts If plan sheets
do not provide the following for each culvert, describe it here. For each design discharge, will operation be outlet (barrel) control or inlet control? Inlet Control Entrance, friction
and exit losses: Bridges Provide all in bridge report STORMWATER DESIGN GUIDELINES Page 25 of26 APPENDIX. D: TECH. DESIGN SUMMARY Effective February 2007 As Revised February 2009
SECTION IX APPENDIX D -TECHNICAL DESIGN SUMMARY Part 4 -Drainage Conce~t and Design Parameters I Continued (Page 4.17) Design Parameters (continued) Computer Software What computer software
has been used in the analysis and assessment of stormwater management needs andlor the development of facility designs proposed for subject property project? List them below, being sure
to identify the software name and version, the date of the version, any applicable patches and the publisher StormNet Version 4.18.2.17854 Apr082009 Gigasoft, Inc. Part 5 -Plans and
S~ecifications Requirements for submittal of construction drawings and specifications do not differ due to use of a Technical Design Summary Report. See Section III. Paragraph C3. Part
6 -Conclusions and Attestation Conclusions Add any concluding information here: Based on the proposed storm system design, the peak post-developed flows will be detained to peak pre-developed
levels for the 2,10,25,50 and 100 year storms. --:::>'-t.-.~~~-~.", Attestation Provide Provide attestation to the accuracy and completeness of the foregoing 6 Parts of this Technical
Desi n Summa Draina e Re art b si nin and sealin below.t--==SI.:..:.....:=.::::..:..:..:.=.L...=:..:...=:.:.=;z..:::...:...;;.:::.==-=-=.L...=:.:sz.:.:.:.:..:.;;>-='-=-=="'-==:..:..:.:.--________
"This report (plan) for the drainage deSign of the development named in Part B was prepare.cJ.·~/by me (or under my supervision) in accordance with provisions of the Bryan/College Station
Unified Drainage DeSign Guidelines for the owners of the property. All licenses anp-permits required by any and all state and federal regulatory agencies for the proposp(i drainage improvements
have been issued or fall under applicable general permits." /(Affix Seal) !/~\r\Licensed Professional Engineer I State of Texas PE No._______ STORMWATER DESIGN GUIDELINES Page 26 of26
APPENDIX. D: TECH, DESIGN SUMMARY Effective February 2007 As Revised February 2009
--~....... eo LEGEND DRAINAGE AREA BOUNDARY ~ DRAINAGE AREA 10 ~ & DIRECTION OF FLOW PROP. MAJOR CONTOURS ~...... STO~M ~ I/UT'""'" 2 ., 221 10 52.' ,.. " .,1.9 ..., 50 ". 52.. 100 78.0
,. r../\,.., SHWGROUP .:lIelll".eT. I •••t ••..,,, I ""••••11. llOE('.REENWAYPI.AZA, ~~,P; 1r0.8 o Gassner EngIneertlll ~1A1h1ord~,smt&102 CoAeg&Statbn,TGXBif 17&40 P,Q.8alc1()'ffl3,1Ta42r0163
m.66ll.$$40(PhoM) e:rrUIS0JJ641(PM) _.goun....,-,g~.tOrn FItmR~H"'"'t>er: F.14S1 FINAL PLANS FOR BIDDING AND CONSTRUCTION COllEGE STATION ISO COLLEGE STATION HIGH SCHOOL PACKAGE-B COLLEGE
STATION, TX CH£Cl<JW: MSI.. Cl2OOIiSHW~ lsao£; 02t1tnC10 SHEET~ PROPOSED DRAINAGE AREA MAP
-l Appendix D Technical Design Summary Unified Stormwater Design Guidelines City of College Station City of Bryan February 2009
SECTION IX APPENDIX D -TECHNICAL DESIGN SUMMARY The Cities of Bryan and College Station both require storm drainage design to follow these Unified Stormwater Design Guidelines. Paragraph
C2 of Section III (Administration) requires submittal of a drainage report in support of the drainage plan (stormwater management plan) proposed in connection with land development projects,
both site projects and subdivisions. That report may be submitted as a traditional prose report, complete with applicable maps, graphs, tables and drawings, or it may take the form of
a "Technical Design Summary". The format and content for such a summary report shall be in substantial conformance with the description in this Appendix to those Guidelines. In either
format the report must answer the questions (affirmative or negative) and provide, at minimum, the information prescribed in the "Technical Design Summary" in this Appendix. The Stormwater
Management Technical Design Summary Report shall include several parts as listed below. below. The information called for in each part must be provided as applicable. In addition to
the requirements for the Executive Summary, this Appendix includes several pages detailing the requirements for a Technical Design Summary Report as forms to be completed. These are
provided so that they may be copied and completed or scanned and digitized. In addition, electronic versions of the report forms may be obtained from the City. Requirements for the means
(medium) of submittal are the same as for a conventional report as detailed in Section III of these Guidelines. Note: Part 1 -Executive Summary must accompany any drainage report required
to be provided in connection with any land development project, regardless of the format chosen for said report. Note: Parts 2 through 6 are to be provided via the forms provided in
this Appendix. Brief statements should be included in the forms as requested, but additional information should be attached as necessary. Part 1 -Executive Summary Report Part 2 -Project
Administration Part 3 -Project Characteristics Part 4 -Drainage Concept and Design Parameters Part 5 -Plans and Specifications Part 6 -Conclusions and Attestation STORMWATER MANAGEMENT
TECHNICAL DESIGN SUMMARY REPORT Part 1 -Executive Summary This is to be a brief prose report that must address each of the seven areas listed below. Ideally it will include one or more
paragraphs about each item. 1. Name, address, and contact information of the engineer submitting the report, and of the land owner and developer (or applicant if not the owner or developer).
The date of submittal should also be included. 2. Identification of the size and general nature of the proposed project, including any proposed project phases. This paragraph should
also include reference to applications that are in process with either City: plat(s), site plans, zoning requests, DESIGN GUIDELINES Page 1 of 26 APPENDIX. D: TECH. DESIGN SUMMARY Effective
February 2007 As Revised February 2009
SECTION IX APPENDIX D -TECHNICAL DESIGN SUMMARY or clearing/grading permits, as well as reference to any application numbers or codes assigned by the City to such request. 3. The location
of the project should be described. This should identify the Named Regulatory Watershed(s) in which it is located, how the entire project area is situated therein, whether the property
straddles a watershed or basin divide, the approximate acreage in each basin, and whether its position in the Watershed dictates use of detention design. The approximate proportion of
the property in the city limits and within the ET J is to be identified, including whether the property straddles city jurisdictional lines. If any portion of the property is in floodplains
as described in Flood Insurance Rate Maps published by FEMA that should be disclosed. 4. The hydrologic characteristics of the property are to be described in broad terms: existing land
cover; how and where stormwater drains to and from neighboring properties; ponds or wetland areas that tend to detain or store stormwater; existing creeks, channels, and swales crossing
or serving the property; all existing drainage easements (or ROW) on the property, or on neighboring properties if they service runoff to or from the property. 5. The general plan for
managing stormwater in the entire project area must be outlined to include the approximate size, and extent of use, of any of the following features: storm drains coupled with streets;
detention /retention facilities; buried conveyance conduit independent of streets; swales or channels; bridges or culverts; outfalls to principal watercourses or their tributaries; and
treatment(s) of existing watercourses. Also, any plans for reclaiming land within floodplain areas must be outlined. 6. Coordination and permitting of stormwater matters must be addressed.
This is to include any specialized coordination that has occurred or is planned with other entities (local, state, or federal). This may include agencies such as Brazos County government,
the Brazos River Authority, the Texas A&M University System, the Texas Department of Transportation, the Texas Commission for Environmental Quality, the US Army Corps of Engineers, the
US Environmental Protection Agency, et al. Mention must be made of any permits, agreements, or understandings that pertain to the project. 7. Reference is to be made to the full drainage
report (or the Technical Design Summary Report) which the executive summary represents. The principal elements of the main report (and its length), including any maps, drawings or construction
documents, should be itemized. An example statement might be: "One __-page drainage report dated one set of construction drawings <__sheets) dated , and a _-.,--...,.-page specifications
document dated ____ comprise the drainage report for this project." STORMWATER DESIGN GUIDELINES Page 2 of26 APPENDIX. D: TECH. DESIGN SUMMARY Effective February 2007 As Revised February
2009
SECTION IX APPENDIX D -TECHNICAL DESIGN SUMMARY Part 2 Project Administration I Start (Page 2.1) I Engineering and Design Professionals Information Engineering Firm Name and Address:
Jurisdiction Gessner Engineering City: Bryan 2501 Ashford Drive Suite 102 X College Station College Station, TX 77840 Date of Submittal: 12 -16-2 009 lead Engineer's Name and Contact
Info.(phone, e-mail, fax): Other: Melissa P. Thomas, P.E. mthomas@ge.com Supporting Engineering I Consulting Firm(s): Other contacts: Developer I Owner I Applicant Information Developer
I Applicant l'Jame and Address: Phone and e-mail: Jon Hall, College Station ISD 979-764 5400 1812 Welsh Av., Suite 120 jhall@csisd.orgCollege Station, TX 77840 Property Owner(s) if not
Developer I Applicant (& address): Phone and e-mail: Project Identification Development Name: CSI SD High School Is subject property a site project, a single-phase subdivision, or part
of a multi-phase subdivision? §ite Project If multi-phase, subject property is phase of legal description of subject property (phase) or Project Area: (see Section II, Paragraph B-3a)
A005401 R. Stevenson (ICL) , Tract 48.1 Vol. 3604, PG243 If subject property (phase) is second or later phase of a project, describe general status of all earlier phases. For most recent
earlier phase Include submittal and review dates. N/A General location of Project Area, or subject property (phase): South corner of Barron Road and Victoria Avenue In City limits? Extraterritorial
Jurisdiction (acreage): Bryan: 0 acres. Bryan: 0 College Station: 0 College Station: 63.665 acres. Acreage Outside ETJ: 0 STORMWATER DESIGN GUIDELINES Page 30f26 APPENDIX. D: TECH. DESIGN
SUMMARY Effective February 2007 As Revised February 2009
SECTION IX APPENDIX D -TECHNICAL DESIGN SUMMARY Part 2 -Project Administration I Continued (page 2.2) Project Identification (continued) Roadways abutting or within Project Area or Abutting
tracts, platted land, or built subject property: developments: Barron Road NW: Needham Estates Victoria Avenue NE: Reatta Meadows SE: Gary Seaback SW: Sonoma Named Regulatory Watercourse(s)
&Watershed(s): Tributary Basin(s): None Spring Creek Plat Information For Project or Subject Property (or Phase) Preliminary Plat File #: NLA Final Plat File #: N/A Date: Name: Status
and VoI/Pg: If two plats, second name: File#: Status: Date: Zoning Information For Project or Subject Property (or Phase) Zoning Type: A-O Existing or Proposed? Existing Case Code: NLA
Case Date NLA Status: ! Zoning Type: Existing or Proposed? Case Code: Case Date Status: Stormwater Management Planning For Project or Subject Property (or Phase) Planning Conference(s)
&Date(s): PartiCipants: September 16, 2009 ty of College Station SHW Group Gessner Engineering Preliminary Report Required? NO Submittal Date Review Date Review Comments Addressed? Yes
N/A No In Writing? When?-Compliance With Preliminary Drainage Report. Briefly describe (or attach documentation explaining) any deviation(s) from provisions of Preliminary Drainage Report,
if any. N/A STORMWATER DESIGN Page 4 26 APPENDIX. D: TECH. DESIGN SUMMARY Effective February 2007 As Revised February 2009
SECTION IX APPENDIX D -"rECHNICAL DESIGN SUMMARY Part 2 -Project Administration J Continued (page 2.3) Coordination For Project or Subject Property (or Phase) • Note: For any Coordination
of stormwater matters indicated below, attach documentation describing and substantiating any agreements, understandings, contracts, or approvals. Coordination Dept. Contact: Date: Subject:
With Other N/A Departments of Jurisdiction City (Bryan or College Station) Coordination With Summarize need(s) & actions taken (include contacts & dates): • Non-jurisdiction City Needed?
Yes No X-Coordination with Summarize need(s) & actions taken (include contacts & dates): Brazos County Needed? • Yes No X-Coordination with Summarize need(s) & actions taken (include
contacts & dates): TxDOT Needed? Yes --No -1L Coordination with Summarize need(s) & actions taken (include contacts & dates): TAMUS Needed? Yes No-Permits For Project or Subject Property
(or Phase) As to stormwater management, are permits required for the proposed work from from any of the entities listed below? If so, summarize status of efforts toward that objective
in spaces below. Entity Permitted or Status of Actions (include dates) Approved? US Army Crops of Engineers No~Yes_ US Environmental • Protection Agency No ~Yes -Texas Commission on
Notice of To be submitted by contractor Environmental Quality Intent . No -Yes~ ! Brazos River IAuthority No_X_ Yes_ I I I I STORMWATER DESIGN GUIDELINES Page 50f26 APPENDIX. D: TECH.
DESIGN SUMMARY Effective February 2007 As Revised February 2009
SECTION IX APPENDIX D -TECHNICAL DESIGN SUMMARY Part 3 Pro~ertv Characteristics I Start (Page 3.1) Nature and Scope of Proposed Work: Existing: Land proposed for development currently
used, including extent of impervious cover? Existing land undeveloped Site __Redevelopment of one platted lot, or two or more adjoining platted lots. Development __Building on a single
platted lot of undeveloped land. Project __Building on two or more platted adjoining lots of undeveloped land. (select all applicable) __Building on a single lot, or adjoining lots,
where proposed plat will not form a new street (but may include ROW dedication to existing streets). _X_ Other (explain): Building on a single unplatted lot of undeveloped land. Subdivision
Development Project Construction of streets and utilities to serve one or more platted lots. __Construction of streets and utilities to serve one or more proposed lots on lands represented
by pending plats. Describe Nature and Size of ProQosed Site projects: building use(s), approximate floor space, impervious cover ratio. Subdivisions: number of lots by general type of
use, linear feet of streets and drainage easements or ROW. Approximately 190,400 sq. ft High School, with a football stadium, baseball tennis courts,, track and associated field buildings
and parking.Project Is any work planned on land that is not platted or on land for which platting is not pending? No X Yes--If yes, explain: Platt to be submitted as as-built documents
after construction is complete FEMA Floodplains Is any part of subject property abutting a Named Regulatory Watercourse I N Y (Section II, Paragraph B1) or a tributary thereof? 0 -es--x-Is
any part of subject property in floodplain INo Yes Rate Map area of a FEMA-regulated watercourse? Encroachment(s) into Floodplain Encroachment purpose(s): __ Building site(s) Road crossing(s)
areas planned? __Utility crossing( s) __Other (explain): No -XN/A Yes -If floodplain areas not shown on Rate Maps, has work been done toward amending the FEMA-approved Flood Study to
define allowable encroachments in proposed areas? Explain. STORMWATER DESIGN GUIDELINES Page 6 of 26 APPENDIX. D: TECH. DESIGN SUMMARY Effective February 2007 As Revised February 2009
--i I SECTION IX APPENDIX D -TECHNICAL DESIGN SUMMARY Part 3 -Prol;!ertv Characteristics Continued (Page 3.2) I Hydrologic Attributes of Subject Property (or Phase) Yes -Reference the
study (& date) here, and attach copy if not already in City files. Is the storm water management plan for the property in substantial conformance with the earlier study? Yes No If not,
explain how it differs. No .-1L If subject property is not part of multi-phase project, describe stormwater management plan for the property in Part 4 . If property is part of multi-phase
project,
provide overview of stormwater management plan for Project Area here. In Part 4 describe how plan for subject property will comply therewith. Has an earlier hydrologic analysis been
done for larger area including subject property? Do existing topographic features on subject property store or detain runoff? -1L-No Yes ( h m . r im' m mDesc Ibe t e (Include app ox
ate Size, volu e, outfall, odel, etc). Any known drainage or flooding problems in areas near subject property? _X_ No -Yes • Identify: Based on location of study property in a watershed,
is Type 1 Detention (flood control) needed? (see Table B-1 in Appendix B) _X_ Detention is required. --Need must be evaluated. __ Detention not required. If the need for Type 1 Detention
must be evaluated: What decision has been reached? By whom? How was determination made? STORMWATER DESIGN GUIDELINES Page 7 of 26 APPENDIX. D: TECH. DESIGN SUMMARY Effective February
2007 As Revised February 2009 I
SECTION IX APPENDIX D -TECHNICAL DESIGN SUMMARY Part 3 Pro~ertv Characteristics I Continued (Page 3.4) Hydrologic Attributes of Subject Property (or Phase) (continued) Conveyance Pathways
(continued) Do drainage easements exist for any part of pathway(s)? -No N/A --Yes If yes, for what part of length? % Created by? __ plat, or __instrument. If instrument(s), describe
their provisions. Pathway Areas Where runoff must cross lower properties, describe characteristics of abutting lower property(ies). (Existing watercourses? Easement or Consent aquired?)
N/A Nearby Drainage Facilities • Describe any built or improved drainage facilities existing near the property (culverts, bridges, lined channels, buried conduit, swales, detention ponds,
etc). Culvert beneath Barron Drive to drainage swale south of subject property_ Do any of these have hydrologic or hydraulic influence on proposed stormwater design? _X_ No --Yes If
yes, explain: STORMWATER DESIGN GUIDELINES Page 9 of26 APPENDIX. D: TECH. DESIGN SUMMARY Effective February 2007 As Revised ~~~~
SECTION IX APPENDIX D -TECHNICAL DESIGN SUMMARY Part 3 -Property Characteristics I Continued (Page 3.3) Hydrologic Attributes of Subject Property (or Phase) (continued) Does subject
property straddle a Watershed or Basin divide? _X_ No __Yes If yes, describe splits below. In Part 4 describe design concept for handling this. Watershed or Basin Larger acreage Lesser
acreage Spring Creek 63.665 Above-Project Areas(Section II, Paragraph B3-a) Does Project Area (project or phase) receive runoff from upland areas? ~No __ Yes Size(s) of area(s) in acres:
1) 2) 3) 4) Flow Characteristics (each instance) (overland sheet, shallow concentrated, recognizable concentrated section(s), small creek (non-regulatory), regulatory Watercourse or
tributary); Flow determination: Outline hydrologic methods and assumptions: Does storm runoff drain from public easements or ROW onto or across subject property? _X_ No __Yes If yes,
describe facilities in easement or ROW: Are changes in runoff characteristics subject to change in future? Explain Conveyance Pathways (Section II, Paragraph C2) Must runoff from study
property drain across lower properties before reaching a Regulatory Watercourse or tributary? X No Yes Describe length and characteristics of each conveyance pathway(s). Include ownership
of property(ies). N/A STORMWATER DESIGN GUIDELINES Page 8of26 APPENDIX. D: TECH. DESIGN SUMMARY Effective February 2007 As Revised Februarv 2009
----SECTION IX APPENDIX D -TECHNICAL DESIGN SUMMARY Part 4 -Drainage Conce~t and Design Parameters Start (Page 4.1) I Stormwater Management Concept Discharge(s) From Upland Area(s) If
runoff is to be received from upland areas, what design drainage features will be used to accommodate it and insure it is not blocked by future development? Describe for each area, flow
section, or discharge point. N/A Discharge(s) To Lower Property(ies) (Section II, Paragraph E1) Does project include drainage features (existing or future) proposed to become public
via platting? ---x-No Yes Separate Instrument? No Per Guidelines reference above, how will __ Establishing Easements (Scenario 1)runoff be discharged to neighboring __ Pre-development
Release (Scenario 2) property(ies) ? N/A Combination of the two Scenarios Scenario 1: If easements are proposed, describe where needed, and provide status of actions on each. (Attached
Exhibit # ) N/A Scenario 2: Provide general description of how release(s) will be managed to pre-development conditions (detention, sheet flow, partially concentrated, etc.). (Attached
Exhibit # ) N/A Combination: If combination is proposed, explain how discharge will differ from pre-development conditions at the property line for each area (or point) of release. N/A
If Scenario 2, or Combination are to be used, has proposed design been coordinated with owner(s) of receiving property(ies)? No Yes Explain and provide documentation. N/A STORMWATER
DESIGN GUIDELINES Page 10 of26 APPENDIX D: TECH. DESIGN SUMMARY Effective February 2007 As Revised February 2009
I SECTION IX APPENDIX D -TECHNICAL DESIGN SUMMARY Part 4 -Drainage Concept and Design Parameters IContinued (Page 4.2) Stormwater Management Concept (continued) Within Project Area Of
Multi-Phase Project Identify gaining Basins or Watersheds and acres shifting: N/AWill project result in shifting runoff between Basins or between i-cW:-:-::'h-aC""t-:'de-s-:'ig-n-a-nd-=--m-:'itC""ig-
a-O:ti-o-n-:-is-u-s-e-:d:-:t-o-c-o-m-p-e-n-sa-:t-e-=fo-r--:i-nc-r-e-a-se-d-:--ru-n-07:ff,-----I Watersheds? from gaining basin or watershed? _X_No __Yes I How will runoff from Project
Area be mitigated to predevelopment conditions? Select any or all of 1, 2, and/or 3, and explain below. 1. __With facility(ies) involving other development projects. 2. __ Establishing
features to serve overall Project Area. 3. On phase (or site) project basis within Project Area. 1. Shared facility (type & location of facility; design drainage area served; relationship
to size of Project Area): (Attached Exhibit # ) N/A 2. For Overall Project Area (type & location of facilities): (Attached Exhibit #___) I N/A i 3. By phase (or site) project: Describe
planned mitigation measures for phases (or sites) in subsequent questions of this Part. Are aquatic echosystems proposed? _X_ No __Yes In which phase(s) or project{s)? "."0 Q) (J) C
Q) Are other Best Management Practices for reducing stormwater pollutants proposed? ~>0:: __No _X_ Yes Summarize type of BMP and extent of use: (J) -Silt fencing at limits of construction
-Inlet protectionC C)'iii -Sedimentation Pond -Sod of landscaping in all disturbed areas Q) 0Oz 11 -construction Entrance If design of any runoff-handling facilities deviate from provisions
of B-CS Technical Specifications, check type facility(ies) and explain in later questions. __Detention elements __Conduit elements __Channel features Q) ..:t __ Swales __ Ditches __
Inlets __Valley gutters __ Outfalls __Culvert features __Bridges Other I STORMWATER DESIGN GUIDELINES Page 11 of26 APPENDIX. D: TECH. DESIGN SUMMARY Effective February 2007 As Revised
February 2009
SECTION IX APPENDIX D -TECHNICAL DESIGN SUMMARY Part 4 -Drainage Conce(!t and Design Parameters I Continued (Page 4.3) Stormwater Management Concept (continued) Within Project Area Of
Multi-Phase Project (continued) Will Project Area include bridge(s) or culvert(s)? _X_ No __Yes Identify type and general size and In which phase(s). If detention/retention serves (will
serve) overall Project Area, describe how it relates to subject phase or site project (physical location, conveyance pathway(s), construction sequence): 2 detention ponds will be located
at the Southeast end of the subject site. Within Or Serving Subject Property (Phase, or Site) If property part of larger Project Area, is design in substantial conformance with earlier
analysis and report for larger area? __Yes No, then summarize the difference(s): N/A Identify whether each of the types of drainage features listed below are and general characteristics.
Typical shape? I Surfaces? C'-. -c (J) U) Steepest side slopes: Usual front slopes: I Usual back slopes: U) ::::I (J) U) >(J) I..c Flow line slopes: least Typical distance from travelway:
U-'0 typical greatest (Attached Exhibit ) (J) 0-c 'iii Z -c ~I!l3 0 Are longitudinal culvert ends in compliance with 8-CS Standard Specifications? ... ~ Yes No, then explain: « U) At
intersections or otherwise, do valley gutters cross arterial or collector streets? .c 0) No Yes If yes explain: :; C'-. >-u-c I..cO)_ U) .~ :: Are valley gutters proposed to cross any
street away from an intersection?U) (J) 1ii:So No Yes Explain: (number of locations?) ~ ClZ ---Ui -g I I I ~ro~ STORMWATER DESIGN GUIDELINES Page 12 of 26 APPENDIX. D: TECH. DESIGN SUMMARY
Effective February 2007 As Revised February 2009
SECTION IX APPENDIX D -TECHNICAL DESIGN SUMMARY Part 4 -Drainage Concel2t and Design Parameters IContinued (Page 4.4) Stormwater Management Concept (continued) Within Or Serving Subject
Property (Phase, or Site) (continued) Gutter line slopes: Least Usual Greatest Are inlets recessed on arterial and collector streets? --Yes -No If "no", identify where and why. Will
inlets capture 10-year design stormflow to prevent flooding of intersections (arterial i with arterial or collector)? __ Yes __No If no, explain where and why not. ('. "0 IV IJI Will
inlet size and placement prevent exceeding allowable water spread for 10-year ::l 0 'Z ~ design storm throughout site (or phase)? Yes No If no, explain.---::l Cl "0 --c:"O ro IV Sag
curves: Are inlets placed at low points? Yes No Are inlets and ..oE --'-.conduit sized to prevent 100-year stormflow from ponding at greater than 24 inches? ::lo c: Yes No Explain "no"
answers. 0 .co --:~ IJI Q) ~-IJI ~ Will 1 OO-yr stormflow be contained in combination of ROWand buried conduit on « whole length of all streets? Yes No If no, describe where and why.
--Do designs for curb, gutter, and inlets comply with 8-CS Technical Specifications? Yes --No If not, describe difference(s) and attach justification. Are any 12-inch laterals used?
__No X Yes Identify length(s) and where -used. ref. sheet CS.O ('. "0 Pipe runs between system I TypicalIV IJI 170 ft Longest 332 ft IJI IV access points (feet): ::l)E X~~l Are junction
boxes used at each bend? --Yes -No If not, explain where and why. IJI .5 0 l.!!z Not used where access is located near the bend. "0 IE "Least amount that hydraulic 0 Are downstream soffits
at or below upstream soffits? U; ~ Yes No __If not, explain where and why: grade line is below gutter line (system-wide): STORMWATER DESIGN GUIDELINES Page 13 of26 APPENDIX. D: TECH.
SUMMARY Effective February 2007 As Revised February 2009
SECTION IX APPENDIX D -TECHNICAL DESIGN SUMMARY Part 4 -Drainage Concept and Design Parameters IContinued (Page 4.5) Stormwater Management Concept (continued) Within Or Serving Subject
Property (Phase, or Site) (continued) Ul <I> o I:: ~ .5 .-..,0-gE ~ :::J ... I:: 0._"E .o.e o I::_.E <I> <I> E -«I fIl fIl ~<I> 1:::2.-> ~ e "00. E"Q)o <I>-..c:: (j)fIl 1!:! «I... «I
a. <I> fIl I:: .8Describe watercourse(s), or system(s) receiving system discharge(s) below (include design discharge velocity, and angle between converging flow lines). 1) Watercourse
(or system), velocity, and angle? 1. Spring Creek Tributary, velocity= 6.7 cfs angle= yo degrees ~~~------~--~~~~~--~--~~---2) Watercourse (or system), velocity, and angle? 1. Spring
Creek Tributary, velocity=9.0 cfs angle= 90 degrees 3) Watercourse (or system), velocity, and angle? For each outfall above, what measures are taken to prevent erosion or scour of receiving
and all facilities at juncture? 1)Riprap to centerline of creek tributary 2) Riprap to centerline centerline of creek tributary 3) I Are swale(s) situated along property lines between
properties? __No __ Yes Number of instances: For each instance answer the following questions. Surface treatments (including low-flow flumes if any): I ('-. N/A ~ ~ fIl .r=~~--~--~~------~--~~-------
-----------------------~ ~ ~ I Flow line slopes (minimum and maximum): ~ I "0 0 ~ Z Outfall characteristics for each (velocity, convergent angle, & end treatment). i1fIl « ~ Will 1 OO-year
design storm runoff be contained within easement(s) or platted drainage ROW in all instances? Yes No If "no" explain. STORMWATER Page 14 of26 APPENDIX. 0: TECH. DESIGN SUMMARY Effective
February 2007 As Revised February 2009
--------SECTION IX APPENDIX D -TECHNICAL DESIGN SUMMARY Part 4 -Drainage Concept and Design Parameters Continued (Page 4,6) Stormwater Management Concept (continued) Within Or Serving
Subject Property (Phase, or Site) (continued) Are roadside ditches used? _X_ No __Yes If so, provide the following: Is 25-year flow contained with 6 inches of freeboard throughout? __
Yes No Are top of banks separated from road shoulders 2 feet or more? __ Yes No Are all ditch sections trapezoidal and at least 1,5 feet deep? Yes No For any "no" answers provide location(s)
and explain' 'iii "0 III 0 0::: I If conduit is beneath a swale, provide the follOwing information (each instance), Instance 1 Describe general location, approximate length: <II (J)
>-• Is 1DO-year design flow contained in conduiUswale combination? Yes No I~ If "no" explain: t: 0 Space for 1 DO-year storm flow? ROW Easement Width Z iii III Swale Surface type, minimum
Conduit Type and size, minimum and maximum and maximum slopes: slopes, design storm: ~Ii ('-, ('-, 2 <II ::0 "0(ij Inlets Describe how conduit is loaded (from streets/storm drains, inlets
by type): III t: t: >t:III III.t: ...0 t: ,g (J) t: Access Describe how maintenance access is provided (to swale, into conduit): c. 0 o :; "-III0 E ::::J ... ,g~ ,£,5 (J) Instance 2
Describe general location, approximate length: "0 E(J) III<II <II::::J (J)<II "0 Is 1DO-year design flow contained in conduiUswale combination? Yes Not: ':;;,Q If "no" explain: Eni C.t:
:.c Q) (J) Space for 1 DO-year storm flow? ROW Easement WidthE .t:0 <II0 Conduit Type and size, minimum and maximum Swale Surface type, minimum -(J)'5 and maximum slopes: slopes, design
storm: ni"0 ... t: III 0 C. 0 (J) Inlets Describe how conduit is loaded (from streets/storm drains, inlets by type): <II(J) -1 t: .3<II (J).... Access Describe how maintenance access
is provided (to swale, into conduit): « STORMWATER DESIGN GUIDELINES Page 15 of 26 APPENDIX, D: TECH, DESIGN SUMMARY Effective February 2007 As Revised February 2009
SECTION IX APPENDIX D -TECHNICAL DESIGN SUMMARY Part 4 -Drainage Concept and Design Parameters I Continued (Page 4.7) Stormwater Management Concept (continued) Within Or Serving Subject
Property (Phase, or Site) (continued) If "yes" provide the following information for each instance: Instance 1 Describe general location, approximate length, surfacing: 'roc: §Jj0..
~ :g (f) Is 1DO-year design flow contained in swale? -2l.. Yes __ No Is swale wholly c: Q) within drainage ROW? __Yes __ No Explain "no" answers: .~ ~I ~----~~~~~--~~----------~--~-------------------
---~ (.) Access Describe how maintenance access is provide: ~ 0;z ~ ~I ~~----~=---~----~~~------~--~--~--~~------------~ ..... Instance 2 Describe general location, approximate length,
surfacing: Q) ·c ('-.::J (f)..Qc:"5 Q) o E:5 Q) Is 1~O-year design flow contained in swale? __ Yes __ No Is swale wholly .~ ~ Q) within drainage ROW? __Yes __ No Explain "no" answers:
(f) ".!!:! 0 ~ S (f) 0 Access Describe how maintenance access is provided: ~~ :0 ::J Q. Instance 3, 4, etc. If swales are used in more than two instances, attach sheet providing all
above information for each instance. "New" channels: Will any area(s) of concentrated flow be channelized (deepened, widened, or straightened) or otherwise altered? __ No __ Yes If only
slightly shaped, see "Swales" in this Part. If creating side banks, provide information below. ('-. "0 c: Will design replicate natural channel? __ Yes __No If "no", for each instance
Q) (f) ro describe section shape & area, flow line slope (min. & max.), surfaces, and 100-year o Q. e: design flow, and amount of freeboard: 2 w Q. Instance 1:(f)(f)-Q)c: Q) >E IQ) >
Instance 2:2 Q. 0.~ z (jj ~Ic: Instance 3:c: ro ..c: 0 i i STORMWATER DESIGN GUIDELINES Page 16 of 26 APPENDIX. D: TECH, DESIGN SUMMARY Effective February 2007 As Revised February 2009
------------SECTION IX APPENDIX D -TECHNICAL DESIGN SUMMARY Part 4 -Drainage Conceet and Design Parameters I Continued (Page 4.8) I Stormwater Management Concept (continued) Within Or
Serving Subject Property (Phase, or Site) (continued) EXisting channels (small creeks}: Are these used? No --Yes If "yes" provide the information below. Will small creeks and their floodplains
remain undisturbed? __ Yes No How ! many disturbance instances? Identify each planned location: For each location, describe length and general type of proposed improvement (including
floodplain changes): For each location, describe section shape & area, flow line slope (min. & max.), surfaces, and 100-year design flow. I S .. CI) ::l c:: c:: Watercourses (and tributaries):
Aside from fringe changes, are Regulatory 0 . Watercourses proposed to be altered? __ No Yes Explain below. .2U) Submit full report describing proposed changes to Regulatory Watercourses.
Address 'E CI) existing and proposed section size and shape, surfaces, alignment, alignment, flow line changes, E CI) length affected, and capacity, and provide full documentation of
analysis procedures >0 and data. Is full report submitted? Yes No If "no" explain: 'c.. E Qj c:: Ic:: t1l .c:: i All Proposed Channel Work: For all proposed channel work, provide information
iu requested in next three boxes. , If design is to replicate natural channel, identify location and length here, and describe design in Special DeSign section of this Part of Report.
,~ Z !Will 1 OO-year flow be contained with one foot of freeboard? Yes No If not, identify location and explain: Are ROW I easements sized to contain channel and required maintenance
space? --Yes No If not, identify location(s) and explain: STORMWATER DESIGN GUIDELINES Page 17 of26 APPENDIX. D: TECH. DESIGN SUMMARY Effective February 2007 As Revised February 2009
I
SECTION IX APPENDIX D -TECHNICAL DESIGN SUMMARY Part 4 -Drainage Conce~t and Design Parameters IContinued (Page 4.9) Stormwater Management Concept (continued) Within Or Serving Subject
Property (Phase, or Site) (continued) til Q) >~I 0 z I ('0. "0 Q) til 0 c-o... a. til Q) ~ '(3 !II u. c:: 0 :.;:::;c:: 2 Q) 0 l!? « How many facilities for subject property project?
2 For each provide info. below. For each dry-type facilitiy: Facility 1 Facility 2 Acres served & design volume + 10% 18.9 4.6 ac-ft 26.0 16.2 ac-ft 1OO-yr volume: free flow & plugged
1.95 ac-ft 2.45 ac-ft 5.49 ac-ft 7.14 ac-ft Design discharge (10 yr & 25 yr) 54.7 cfs 64.3 cfs 44.8 cfs 52.0 cfs Spillway crest at 1 OO-yr WSE? -Lyes -no .....K..-yes -no Berms 6 inches
above plugged WSE? _X_yes -no _X_yes -no Explain any "no" answers: For each facility what is 25-yr design Q, and design of outlet structure? Facility 1: See detail sheet CS.l, 64.3 cfs
Facility 2: See detail sheet CS.S, 52.0 cfs Do outlets and spillways discharge into a public facility in easement or ROW? Facility 1: __ Yes X No Facility 2: Yes X No--If "no" explain:
Discharges into tributary Spring Creekto For each, what is velocity of 25-yr design discharge at outlet? & at spillway? Facility 1: 4.0 cfs & 0 Facility 2: 5.0 cfs & 0 Are energy dissipation
measures used? -No Yes Describe type and location: Dissipator blocks and at each outlet For each, is spillway surface treatment other than concrete? Yes or no, and describe: Facility
1: No Facility 2: No For each, what measures are taken to prevent erosion or scour at receiving facility? Facility 1: Dissipator blocks and at outfalls Facility 2: Dissipator blocks
and riprap at outfalls If berms are used give heights, slopes and surface treatments of sides. Facility 1: 5 ft, Max 3: I, grass Facility 2: 6 ft, Max 3: I, grass STORMWATER DESIGN GUIDELINES
Page 18 of 26 APPENDIX. D: TECH. DESIGN SUMMARY Effective February 2007 As Revised February 2009
SECTION IX APPENDIX D -TECHNICAL DESIGN SUMMARY Part 4 -Drainage Concel2t and Design Parameters IContinued (Page 4.10) Stormwater Management Concept (continued) Within Or Serving Subject
Property (Phase, or Site) (continued) Do structures comply with 8-CS Specifications? Yes or no, and explain if "no": fII Facility 1; Yes ~ ==S ~ Q) ! Facility 2: YesI.L. :::JC:,EOc:
+:i0c: (.) Q) --Q) For additional facilities provide all same information on a separate sheet. 0 Are parking areas to be used for detention? _X_ No --Yes What is maximum depth due to
required design storm? Roadside Ditches: Will culverts serve access driveways at roadside ditches? -No --Yes If "yes", provide information in next two boxes. Will 25-yr. flow pass without
flowing over driveway in all cases? -Yes -No Without causing flowing or standing water on public roadway? -Yes -No Designs & materials comply with 8-CS Technical Specifications? __Yes
-No Explain any "no" answers: ".fII OJ c: 'iii Are culverts parallel to public roadway alignment? __Yes No Explain:fII e -(.) fII ~~ I1l I>.;:: Creeks at Private Drives: Do private driveways,
drives, or streets cross drainage c.. iii ways that serve Above-Project areas or are in public easements! ROW? "0 0 No Yes If "yes· provide information below. Q)Z --~~I How many instances?
Describe location and provide information below. Q) Location 1: ~ :::J (.) Q) Location 2: .... « Location 3: For each location enter value for: 1 2 3 Design year passing without toping
travelway? Water depth on travelway at 25-year flow? Water depth on travelway at 1 OO-year flow? For more instances describe location and same information on separate sheet. STORMWATER
DESIGN GUIDELINES Page 19 of26 APPENDIX. D: TECH. DESIGN SUMMARY Effective February 2007 As Revised February 2009
SECTION IX APPENDIX D -TECHNICAL DESIGN SUMMARY Part 4 -Drainage Conce(!t and Design Parameters 1Continued (Page 4.11) Stormwater Management Concept (continued) Within Or Serving Subject
Property (Phase, or Site) (continued) Named Regulato!:ll Watercourses {& Tributariesl: Are culverts proposed on these facilities? No __Yes, then provide full report documenting assumptions,
criteria, analysis, computer programs, and study findings that support proposed design(s). Is report provided? __Yes -No If "no", explain: ~ Arterial or Major Collector Streets: Will
culverts serve these types of roadways? (I) __No Yes How many instances? For each identify the ..c <I) location and provide the information below. $ <I) ~ Instance 1:(I) m >-0. I~ Instance
2: Instance 3: 0 o'lil zE Yes or No for the 100-year design flow: 1 2 3 IS Headwater WSE 1 foot below lowest curb top? x.~ Spread of headwater within ROW or easement? E('. m Is velocity
limited per conditions (Table C-11)? <I) <I)g>"O Explain any "no" answer(s): .cl2 m o c c .... 0 0:.;::::; >o-m m 0 3..2 "0(1)m..ce "C Minor Collector or Local Streets: Will CUlverts
serve these types of streets? o 0 No Yes How many instances? for each identify the =g) ---§"O location and provide the information below: 0.(1) .... 0. Instance 1:m;:;. "0>0Instance
2:(I) c <I) m ::J_ Instance 3:<I) 0 1::<1)(I) (I) ~o For each instance enter value, or "yes" I "no" for: 1 2 3::J C om Design yr. headwater WSE 1 ft. below curb top? (I) iii .... C«
.100-yr. max. depth at street crown 2 feet or less? ~ 0 Product of velocity (fps) & depth at crown (ft) = ?E .... g Is velocity limited per conditions (Table C-11)? Limit of down stream
analysis (feet)? Explain any uno" answers: STORMWATER DESIGN GUIDELINES Page 20 of26 APPENDIX. D: TECH. DESIGN Effective February 2007 As Revised Fe'
------SECTION IX APPENDIX D -TECHNICAL DESIGN SUMMARY Part 4 -Drainage Conceet and Design Parameters IContinued (Page 4.12) Stormwater Management Concept (continued) Within Or Serving
Subject Property (Phase, or Site) (continued) '0 (l) ::I .S: C 0 .£. II) 1::: (l) >::; (.) t<l! "Z All Proposed Culverts: For all proposed culvert facilities (except driveway/roadside
ditch intersects) provide information requested in next eight boxes. Do culverts and travelways intersect at 90 degrees? Yes No If not, identify location(s) and intersect angle(s), and
justify the design(s)-:Does drainage way alignment change within or near limits of culvert and surfaced approaches thereto? __ No Yes If "yes" identify location(s), describe change(s),
and justification: Are flumes or conduit to discharge into culvert barrel(s)? __No __ Yes If yes, identify location(s) and provide justification: Are flumes or conduit to discharge into
or near surfaced approaches to culvert ends? No Yes If "yes" identify location(s), describe outfall design treatment(s): Is scour/erosion protection provided to ensure long term stability
of culvert structural components, and surfacing at culvert ends? __Yes __ No If "no" Identify locations and provide justification(s): Will 1 OO-yr flow and spread of backwater be fully
contained in street ROW, and/or drainage easements/ROW? __ Yes __ No if not, why not? Do appreciable hydraulic effects of any culvert extend downstream or upstream to Ifneighboring land(s)
not encompassed in subject property? __No __Yes "yes" describe location(s) and mitigation measures: Are all culvert designs and materials in compliance with B-C~ Tech..specifications?
Yes No If not, explain in Special Design Section of thiS Part. STORMWATER DESIGN GUIDELINES Page 21 of 26 APPENDIX D: TECH DESIGN SUMMARY As Revised February 2009 Effective February
2007
------SECTION IX APPENDIX D -TECHNICAL DESIGN SUMMARY Part 4 -Drainage Conceet and Design Parameters IContinued (Page 4.13) Stormwater Management Concept (continued) I Within Or Serving
Subject Property (Phase, or Site) (continued) I :~ a bridge included in plans for subject property project? --X-No --Yes f "yes" provide the following information. Name(s) and functional
classification of the roadway(s)? What drainage way(s) is to be crossed? VI Q) O"l "0.;:: III A full report supporting all aspects of the proposed bridge(s) (structural, geotechnical,
hydrologic, and hydraulic factors) must accompany this summary report. Is the report provided? --Yes -No If "no" explain: Is a Stormwater Provide a general description of planned techniques:
~ Pollution Prevention Silt fencing ro ::J 0 Plan (SW3P) established for Inlet Protection .... (J) • project construction? Stabilized construction entrance ~ No --1L Yes Sod or landscape
at all disturbed areas i Sedimentation Pond Special Designs -Non-Traditional Methods Are any non-traditional methods (aquatic echosystems, wetland-type detention, natural stream replication,
BMPs for water quality, etc.) proposed for any aspect of subject property project? No Yes If "yes" list general type and location below. Provide full report about the proposed special
design(s) including rationale for use and expected benefits. Report must substantiate that stormwater management objectives will not be compromised, and that maintenance cost will not
exceed those of traditional design solution(s). Is report provided? Yes No If "no" explain: STORMWATER DESIGN GUIDELINES Page 22 of 26 APPENDIX. D TECH. DESIGN SUMMARY Effective February
2007 As Revised February 2009
--------SECTION IX APPENDIX D -TECHNICAL DESIGN SUMMARY • Part 4 -Drainage Concept and Design Parameters Continued (Page 4.14) Stormwater Management Concept (continued) Within Or Serving
Subject Property (Phase, or Site) (continued) Special Designs -Deviation From B-CS Technical Specifications If any design(s) or material(s) of traditional runoff-handling facilities
deviate from provisions of B-CS Technical Specifications, check type facility(ies) and explain by specific detail element. --Detention elements X Drain system elements Channel features
--Culvert features --Swales Ditches Inlets __Outfalls , __Valley gutters __ Bridges (explain in bridge report) In table below briefly identify specific element, justification for deviation(s).
Specific Detail Element 1) HDPE pipe Justification for Deviation (attach additional sheets if needed) Only in private development 2) 3) 4) 5) i !Have elements been coordinated with the
City Engineer or her/his designee? For each item above provide "yes" or "no", action date, date, and staff name: 1) Yes, Carol Cotter 2) 3) 4) 5) I Design Parameters I Hydrology Is a
map(s) showing all Design Drainage Areas provided? _X_ Yes -No Briefly summarize the range of applications made of the Rational Formula: Rational Formula not used. Calculations in accordance
with USDA TR-55 What is the size and location of largest Design Drainage Area to which the Rational Formula
has been applied? 0 acres Location (or identifier): I STORMWATER DESIGN GUIDELINES Page 23 of 26 APPENDIX. D: TECH. DESIGN SUMMARY Effeclive February 2007 As Revised February 2009
SECTION IX APPENDIX D -TECHNICAL DESIGN SUMMARY Part 4 -Drainage Concept and Design Parameters Continued (Page 4.15) Design Parameters (continued) Hydrology (continued) In making determinations
for time of concentration, was segment analysis used? No ..JL Yes In approximately what percent of Design Drainage Areas? % • As to intensity-duration-frequency and rain depth criteria
for determining runoff flows, were any criteria other than those provided in these Guidelines used? _X_ No __Yes If "yes' • identify type of data source(s) and where applied' , , For
each of the storm water management features listed below identify the storm return • frequencies (year) analyzed (or checked), and that used as the basis for design. Feature Analysis
Year(s) Design Year Storm drain system for arterial and collector streets N/A N/A Storm drain system for local streets N/A N/A Open channels N/A N/A Swale/buried conduit combination
in lieu of channel N/A N/A Swales N/A N/A ! Roadside ditches and culverts serving them N/A N/A • Detention facilities: spillway crest and its outfall 2,10,25,50,100 100 Detention facilities:
outlet and conveyance structure(s) 2,10,25,50,100 2 Detention facilities: volume when outlet plugged 2,10,25,50,100 100 Culverts serving private drives or streets N/A N/A Culverts serving
public roadways N/A N/A Bridges: provide in bridge report. N/A N/A Hydraulics What is the range of design flow velocities as outlined below? i Design flow velocities; Gutters Conduit
Culverts Swales Channels Highest (feet per second) N/A 9.58 N/A N/A N/A Lowest (feet per second) N/A 2.33 N/A N/A N/A Streets and Storm Drain Systems Provide the summary information
outlined below: Roughness coefficients used: For street gutters: NLA For conduit type(s) HDPE QiQe Coefficients: O. 015 I STORMWATER Page 24 of26 APPENDIX. D: TECH. DESIGN SUMMARY Effective
February 2007 As Revised February 2009
--I i SECTION IX APPENDIX D -TECHNICAL DESIGN SUMMARY Part 4 -Drainage Concel;!t and Design Parameters IContinued (Page 4.16) Design Parameters (continued) Hydraulics (continued) Street
and Storm Drain Systems (continued) For the following, are assumptions other than allowable per Guidelines? Inlet coefficients? -1L No --Yes Head and friction losses --1L No --Yes Explain
any "yes" answer: In conduit is velocity generally increased in the downstream direction? --LYes No Are elevation drops provided at inlets, manholes, and junction boxes? --LYes --No
Explain any "no" answers: Are hydraulic grade lines calculated and shown for design storm? --1L Yes --No For 1 DO-year flow conditions? -1L Yes --No Explain any "no" answers: i What
tailwater conditions were assumed at outfall point(s) of the storm drain system? Identify each location and explain: Free outfall Open Channels If a HEC analysis is utilized, does it
follow Sec VI.F.S.a? I::UA Yes __ No Outside of straight sections, is flow regime within limits of sub-critical flow? __ Yes __ No I If "no" list locations and explain: i N/A rCulverts
If plan sheets do not provide the follOWing for each culvert, desc Ibe It here. For each design discharge, will operation be outlet (barrel) control or inlet control? Inlet Control i
Entrance, friction and exit losses: Bridges Provide all in bridge report STORMWATER DESIGN GUIDELINES Page 25 of26 APPENDIX. D: TECH. DESIGN SUMMARY Effective February 2007 As Revised
February 2009
SECTION IX APPENDIX D -TECHNICAL DESIGN SUMMARY Part 4 -Drainage Concept and Design Parameters IContinued (Page 4.17) Design Parameters (continued) Computer Software What computer software
has been used in the analysis and assessment of stormwater management needs and/or the development of facility designs proposed for subject property project? List them below, being sure
to identify the software name and version, the date of the version, any applicable patches and the publisher StormNet Vers 4.18.2.17854 Apr082009 Gigasoft, Inc. Part 5 -Plans and Specifications
Requirements for submittal of construction drawings and specifications do not differ due to use of a Technical Design Summary Report. See Section III, Paragraph C3. Part 6 -Conclusions
and Attestation Conclusions Add any concluding information here: Based on the proposed storm system design, the peak postdeveloped flows will be detained to peak pre developed levels
for the 2,10,25,50 and 100 year storms. Attestation Provide attestation to the accuracy and completeness of the foregoing 6 Parts of this Technical Design Summary Drainage Report by
Signing and sealing below. "This report (plan) for the drainage design of the development named in Part B was prepared by me (or under my supervision) in accordance with provisions of
the Bryan/College Station Unified Drainage Design Guidelines for the owners of the property. All licenses and permits required by any and all state and federal regulatory agencies for
the propop'~ improvements have been issued or fall under applicable general permits." -~....'\£.9.f rt>-'" .~1t~ (Affix Seal) /.'~~"*'.....!!.~" a.,. : ... ~. ~....:........ ~ * l MO
•••••.•••••••• : ••. Licensed ofessional Engineer l-''':'''~?~~''~' LUND. ~ \ 105067···:r··~ State of Texas PE No. lO~(,'7';\;··.~!CEN_O.~..i.";-,. ~ ~ ',l".t/~·····~·::--STORMWATER
DESIGN GUIDELINES Page 26 of26 APPENDIX. D: TECH. DESIGN SUMMARY Effective February 2007 As Revised February 2009
SECTION IX APPENDIX D -TECHNICAL DESIGN SUMMARY Part 4 -Drainage Conce~t and Design Parameters IContinued (Page 4.11) Stormwater Management Concept (continued) Within Or Serving Subject
Property (Phase, or Site) (continued) Named Regulato!y Watercourses (& Tributaries}: Are culverts proposed on these facilities? No __Yes, then provide full report documenting assumptions,
criteria, analysis, computer programs, and study findings that support proposed design(s). Is report provided? __Yes -No If "no", explain: ~ Arterial or Major Collector Streets: Will
culverts serve these types of roadways?4) No Yes How many instances? For each identify the ,L; Ul --4) location and provide the information below. (/)~ Instance 1:4)<tI >-e. I~ Instance
2: Instance 3: r::: 0 I 1~ Yes or No for the 100-year design flow: 2 3o <tI ZE I~ Headwater WSE 1 foot below lowest curb top? .e :x: .~ Spread of headwater within ROW or easement? E
c-. <tI Is velocity limited per conditions (Table C-11)? UI UI g>'U Explain any "no" answer(s): .r::: ~ <tI o r::: ~ 0 (.)~ »<tI<tI (.) ~.Q 'U4)<tI.o Minor Collector or Local Streets:
Will culverts serve these types of streets?0._ ~ ~ (.) (.) No Yes How many instances? for each identify the ._ UI ---4) -§'U location and provide the information below: e.4)_e. Instance
1:<til:' 'U» IInstance 2:4) r::: UI <tI :::l_ UI 0 Instance 3: t::l/)4) 4) • For each instance enter value, or "yes" '''no'' for: 1 2 3..2!(.) :::l r::: I ........~ ~~ ! Design yr. headwater
WSE 1 ft. below curb top? "r::: I<{ .• 100-yr. max. depth at street crown 2 feet or less? ~ 0 Product of velocity (fps) & depth at crown (ft) = ?E ~ g · Is velocity limited per conditions
(Table C-11)? ! Limit of down stream analysis (feet)? Explain any "no" answers: STORMWATER Page 20 of26 APPENDIX. D: TECH. DESIGN SUMMARY Effective February 2007 As Revised February
2009
----------SECTION IX APPENDIX D -TECHNICAL DESIGN SUMMARY iPart 4 -Drainage ConceQt and Design Parameters I Continued (Page 4.12) Stormwater Management Concept (continued) ! Within Or
Serving Subject Property (Phase, or Site) (continued) All Proposed Culverts: For all proposed culvert facilities (except driveway/roadside ditch intersects) provide information requested
in next eight boxes. Do cUlverts and travelways intersect at 90 degrees? Yes No If not, identify location(s) and intersect angle(s), and justify the design{s): Does drainage way alignment
change within or near limits of culvert and surfaced approaches thereto? __ No Yes If "yes" identify location(s), describe change(s), and justification: Are flumes or conduit to discharge
into culvert barrel(s)? __ No __ Yes If yes, identify location(s) and provide justification: Are flumes or conduit to discharge into or near surfaced approaches to culvert ends? :c-No
Yes If "yes" identify location(s), describe outfall design treatment(s): (J) :::; c: :.;:; c: 0 ~ (/) 1:: (J) > • Is scour/erosion protection provided to ensure long term stability of
culvert structural "S () components, and surfacing at culvert ends? __Yes __ No If "no" Identify • locations and provide justification{s): · Will 1 OO-yr flow and spread of backwater
be fully contained in street ROW, and/or drainage easements/ROW? __ Yes __ No if not, why not? · Do appreciable hydraulic effects of any culvert extend downstream or upstream to · neighboring
land{s) not encompassed in subject property? No Yes If "yes" describe location(s) and mitigation measures: • Are all culvert designs and materials in compliance with 8-CS Tech. Specifications?
i 1 __Yes __ No If not, explain in Special Design Section of this Part. STORMWATER DESIGN GUIDELINES Page 21 of26 APPENDIX. D: TECH. DESIGN SUMMARY Effective February 2007 As Revised
February 2009