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HomeMy WebLinkAbout13 David Price Homebuilders 04-46 215 Rock PrairieDRAINAGE REPORT FOR Lot 5, Block 4 - Edelweiss Business Center S. Grohom Rood Vicinity Map (n.t.s.) AUGUST, 2004 Prepared By: McClure t Browne Engineering, Inc. 1008 Woodcreek Drive, Suite 103 College Station, Texas 77845 (979) 693-3838 DRAINAGE REPORT FOR Lot 5, Block 4 Edelweiss Business Center S. Graham Rood Vicinity Map (n .t.s.) AUGUST, 2004 Prepared By: McClure t Browne Engineering, Inc. 1008 Woodcreek Drive , Suite 103 College Stati on, Texas 77845 (979) 693-3838 CERTIFICATION I, Michael R. McClure, Registered Professional Engineer No. 32740, State of Texas , certify that this report for the drainage design of the LOT 5, BLOCK 4 , EDELWEISS BUSINESS CENTER, the DAVID PRICE HOMEBUILDERS Project, was prepared by me in accordance with the provisions of the City of College Station Drainage Policy and Design Standards for the owners thereof 8fa/o~ Mic ael R. McClure, P .E . # 32740 .. DRAINAGE REPO RT Lot 5, Block 4, Edelw eiss Business Center DRAINAGE REPORT INTRODUCTION LOCATION DESCRIPTION DRAINAGE BASIN TABLE OF CONTENTS STORM DRAIN DESIGN CRITERIA STORM DRAIN SYSTEM DESIGN DETENTION POND DESIGN CONCLUSION TABLE OF EXHIBITS EXCERPT FROM FLOOD INSURANCE RATE MAP EXISTING CONDITION DRAINAGE AREA MAP PROPOSED CONDITION DRAINAGE AREA MAP RATIONAL METHOD CALCULATIONS DETENTION POND ROUTING HYDROGRAPH PLOTS FLUME CAPACITY ANALYSIS D RAINAGE REPORT Lot 5 , Block 4 Edelw eiss Bu sin ess Center 1 1 1 2 2 2 2 3 A B-1 B-2 C-1 D-1 D-2 E-1 ii INTRODUCTION STORM DRAINAGE REPORT Lot 5, Block 4 Edelweiss Business Center (David Price Homebuilders) College Station, Texas This study is intended to describe the effects upon the drainage system that result from the development of a 0.75-acre tract in the Edelweiss Business Center. It compares the existing and proposed conditions to show that improvements associated with the development do not cause adverse impacts on downstream properties . LOCATION The site is located in College Station, near the intersection of Rock Prairie Road and FM 2174 (Wellborn Road). The site is bounded by Rock Prairie Road to the South, property owned by Texas Hotel Corporation to the East, Lots 28-30, Block 12 ofEdelweiss Estates to the North and property owned by Moreau Family Investments Ltd. to the West . DESCRIPTION The portion of the site that is being developed covers approximately 0.25-acres and is being developed as an office building and parking lot. The site is currently covered by pastureland consisting of native grass and brush. The sites drain to the south to the Rock Prairie Road drainage system. DRAINAGE REPOR T Pg. 1 Lot 5 , Block 4 Edelweiss Bu sin ess Ce nt er DRAINAGE BASIN The site li e s in the drainage basin of Lick Creek, which is a tributary of Carters Creek and the Navasota River . No part of the site is located in a 100-Year Flood Hazard Area according to the Flood Insurance Rate Maps for Brazos County, Texas and Incorporated Areas, Map No. 48041Cl82 C effective July 2 , 1992 as prepared by the Federal Emergency Management Agency (See Exlubit A). STORM DRAIN DESIGN CRITERIA The proposed drainage system is designed in accordance with the City of College Station Drainage Policy and Design Standards (DPDS). The design storm for the underground system is a 10-year event, and flow calculations are based on the Rational Method. Pipe sizes were determined from Manning 's Equation using an "n" of 0.014. STORM DRAIN SYSTEM DESIGN Storm water from the proposed development will be captured in the parking lot curbs and conveyed to the curb opening located in the southeast corner of the site where it is detained slowly released into Rock Prairie Road. Exhibit C-1 gives the runoff calculations for the drainage areas. Inlet sizing computations are shown in Exhibit C-2 , and Exhibit C-3 shows the pipe slope calculations based on Manning 's equation. All computations use the parameters provided in the DPDS. DETENTION POND DESIGN The proposed detention pond is located in the southern end of the property. It consists of a 2' wide curb opening and a flume. The parking lot is being used for the storage volume ne cessary for DRAINAG E REPORT Pg . 2 Lot 5 , Block 4 E delwe iss Busin ess Center the pond. The outlet for this pond is a 2' wide curb opening. The pond discharges into the existing curb line of Rock Prairie Road. The pond was modeled for the 5, 10, 25 , 50 , and 100-year storm events. The hydro logic analysis of the drainage system is shown in Exhibits D-1 and D-2. Exhibit D-1 shows the hydraulic routing for the detention pond. Exhibit D-2 shows hydraulic routing for the existing pond. A summary of the combined drainage effects is shown below: Event 5 year 10 year 25 year 50 year 100 year CONCLUSION Total Existmg Proposed Flowrate 3.2 cfs 3.5 cfs 3 .9 cfs 4.3 cfs 4.8 cfs TABLE 1 Condition Flowrate 3.2 cfs 3 .5 cfs 4.0 cfs 4.5 cfs 5.1 cfs The post-development flowrate is reduced to a level less than the pre-development fl.owrate for the 5 , 10, 25 , 50, and 100-year events. The 100-year event is contained in the ponds and released through the pond outlet devices. The drainage design for this site meets the requirements as stated in the City of College Station Drainage Policy and Design Standards. DRAINAGE REPORT Pg . 3 Lot 5, Block 4 Edelweiss Business Cent er N.T.S . Braws County Unincorporated Areas 481195 EXHIBIT A Flood Insurance Rate Mop Excerpt Brazos County, Texas and Incorporated Areas Mop Numbers: 48041C0182C Effective Date: JULY 2, 1992 ~ ~ c 0 0:: w ...J ...J < ~ a.. < IL w 0 j:: I-c (!) 0:: ...J z < z < < w z w 0 :5 :i: ~~ w ::e z ...J c ...J 0:: I- ~ ~ c;; w ~ w (!) > >z 0 ~~ w < g c I-0:: a.. o~ NO. AC. 0.4 0.55 0.9 ft . Ex1 0 .90 0 .90 0 .00 0 .00 0 .36 355 .0 1 0 .55 0 .55 0 .00 0 .00 0 .22 271 .0 2 0 .25 0 .06 0 .00 0.1 9 0 .20 93 .0 3 0 .10 0 .10 0 .00 0.00 0 .04 71 .0 EXHIBIT C-1 Rational Formula Drainage Area Calculations Edelweiss Business Center, Lot 5, Block 4 ~ 0 ~ ~ ...J IL 0 c ...J ...J z IL IL ~ :5 0:: :i: 0:: u 0 u w I-w I-I-0:: ...J I= (!) I= ...J 0 u w ...J :::>z :::> ...J ...J w >< ~ 'i (/) N II) 0 IL (!)~ (!) ~ 0 :::> !::! a !!? a ft. ft. ft. ft/s min min In/Hr cfs In/Hr cfs 5.0 1.0 1 .0 0 .8 7 .1 7.1 7.31 2 .6 8 .8 3 .2 3 .0 1.0 1.0 0.7 6 .1 6 .1 7 .71 1.7 9 .3 2 .0 1 .0 64 .0 1.0 1.0 2 .5 5 .0 8 .22 1.6 9 .9 1.9 1.0 1 .0 1.0 0 .8 1 .4 5 .0 8.22 0 .3 9.9 0 .4 0 II) 0 ... II) a :!: a !::! In/Hr cfs In/Hr cfs 9 .9 3.5 11.2 4 .0 10.4 2 .3 11.8 2 .6 11 .0 2 .1 12 .5 2.4 11.0 0.4 12.5 0 .5 ~ ~ a In/Hr cfs 12 .7 4 .6 13 .3 2 .9 14 .1 2 .7 14.1 0 .6 0 0 0 0 ... :!: a In/Hr cfs 14 .2 5.1 14 .9 3.3 15 .8 3.1 15 .8 0 .6 8/6/2 004 10 72 0002 -dra .xls Ex hi bit C-1 D.A. # D.A. # D.A.# 'II: .r:. 0 a. w ~ z C> iii e ::!! "O >. 0 J: .... N 0 Qp 2.0 1.9 Tc 6.1 5.0 inc 1.0 2.0 Time cfs cfs 0.0 0.0 0.0 0.0 1.0 0.3 0.4 0.7 2.0 0.7 0.8 1.4 3.0 1.0 1.2 2.2 4.0 1.3 1.5 2.9 5.0 1.7 1.9 3.6 6.0 2.0 1.7 3.7 7.0 1.9 1.5 3.4 8.0 1.7 1.3 3.1 9.0 1.5 1.2 2.7 10.0 1.4 1.0 2.3 11.0 1.2 0.8 2.0 12.0 1.0 0.6 1.6 13.0 0.9 0.4 1.3 14.0 0.7 0.2 0.9 15.0 0.5 0.0 0.5 16.0 0.4 0.0 0.4 17.0 0.2 0.0 0.2 18.0 0.0 0.0 0.0 19.0 0.0 0.0 0.0 20.0 0.0 0.0 0.0 PEAK FLOWS 2.0 1.9 3.7 0. 00 indicates inital condition EXHIBIT "D-1" PROPOSED DETENTION POND ROUTING Edelweiss Business Center, Lot 5, Block 4 Pond Routing EVENT= 5 D.A.# c: a t. c: c: '.!:! .5! .... ~ + .... .... "O 1V c: + + c: + c: > I/) I/) c: 0 .!! .: N N a n. w .., 0.4 5.0 cfs cfs cfs cfs ft cfs 0.72 0.00 0.00 0.00 332.2 0.0 2.16 0.14 0.72 0.29 332.3 0.1 3.60 0.69 2.30 0.81 332.5 0.2 5.04 1.98 4.29 1.15 332.6 0.2 6.48 3.77 7.03 1.63 332.7 0.3 7.34 6.04 10.25 2.10 332.8 0.4 7.17 8.41 13.39 2.49 332.9 0.4 6.48 10.07 15.58 2.76 332.9 0.3 5.76 10.80 16.55 2.87 332.9 0.3 5.04 10.82 16.57 2.88 332.9 0.2 4.32 10.28 15.86 2.79 332.9 0.2 3.60 9.33 14.61 2.64 332.9 0.2 2.88 8.07 12.94 2.43 332.8 0.1 2.16 6.58 10.96 2.19 332.8 0.1 1.44 4.90 8.74 1.92 332.8 0.0 0.92 3.33 6.35 1.51 332.7 0.0 0.58 1.95 4.24 1.14 332.6 0.0 0.24 0.84 2.53 0.85 332.5 0.0 0.04 0.24 1.08 0.42 332.4 0.0 0.00 O.Q3 0.28 0.12 332.3 0.0 0.00 0.00 0.03 0.02 332.2 0.0 2.9 332.9 0.4 0 w I/) ..J 0 c( n. I-0 0 a:: I-n. cfs 0.00 0.37 0.96 1.39 1.94 2.50 2.84 3.07 3.15 3.11 2.99 2.79 2.55 2.27 1.96 1.51 1.14 0.85 0.42 0.12 0.02 3.2 D.A.# .... )( w 3.2 6.8 cfs 0.0 0.5 1.0 1.4 1.9 2.4 2.9 3.2 2.9 2.7 2.4 2.2 2.0 1.7 1.5 1.3 1.0 0.8 0.5 0.3 0.1 3.2 10720002-dra.xls Exhibit D-1 0 ..J z c( I= I-!!! OX I-w cfs 0.00 0.48 0.95 1.43 1.91 2.38 2.86 3.16 2.93 2.69 2.45 2.21 1.97 1.73 1.50 1.26 1.02 0.78 0.54 0.30 0.07 3.2 D.A.# D.A.# D.A. # '*!: .i:: 0 a. w !! z Cl iii 0 ... == ,, >-0 :c ..... "' 0 Qp 2.3 2.1 Tc 6.1 5.0 inc 1.0 2.0 Time cfs cfs 0.0 0.0 0.0 0.0 1.0 0.4 0.4 0.8 2.0 0.8 0.9 1.6 3.0 1.1 1.3 2.4 4.0 1.5 1.7 3.2 5.0 1.9 2.1 4.0 6.0 2.3 1.9 4.2 7.0 2.1 1.7 3.8 8.0 1.9 1.5 3.4 9.0 1.7 1.3 3.0 10.0 1.5 1.1 2.6 11.0 1.4 0.9 2.2 12.0 1.2 0.6 1.8 13.0 1.0 0.4 1.4 14.0 0.8 0.2 1.0 15.0 0.6 0.0 0.6 16.0 0.4 0.0 0.4 17.Q 0..2 Q.O Q.2 18.0 0.0 0.0 0.0 19.0 0.0 0.0 0.0 20.0 0.0 0.0 0.0 PEAK FLOWS 2.3 2.1 4.2 0.00 indicates inital condition EXHIBIT "D-1" PROPOSED DETENTION POND ROUTING Edelweiss Business Center, Lot 5, Block 4 Pond Routing EVENT= 10 D.A.# c a t. c c ~ 0 ..... ~ "C ~ + ..... c + + + c c > Ill Ill c 0 .! c "' "' a 0.. w .., 0.4 5.0 cfs cfs cfs cfs ft cfs 0.80 0.00 0.00 0.00 332.2 0.0 2.41 0.16 0.80 0.32 332.3 0.1 4.02 0.87 2.57 0.85 332.5 0.2 5.62 2.37 4.88 1.26 332.6 0.3 7.23 4.40 7.99 1.80 332.7 0.4 8.19 7.08 11.63 2.27 332.8 0.4 8.00 9.84 15.28 2.72 332.9 0.4 7.23 11.77 17.84 3.03 332.9 0.4 6.43 12.66 19.01 3.17 333.0 0.3 5.63 12.72 19.09 3.18 333.0 0.3 4.83 12.16 18.35 3.09 333.0 0.2 4.02 11.13 16.99 2.93 332.9 0.2 3.22 9.75 15.15 2.70 332.9 0.1 2.42 8.09 12.96 2.44 332.8 0.1 1.61 6.24 10.51 2.14 332.8 0.0 1.02 4.31 7.85 1.77 332.7 0.0 0.65 2.66 5.33 1.33 332.6 0.0 Q.27 . 1.34. 3.l.1 Q.98. 33.2.6. Q.O 0.04 0.38 1.62 0.62 332.5 0.0 0.00 0.06 0.42 0.18 332.3 0.0 0.00 0.00 0.06 0.05 332.3 0.0 3.2 333.0 0.4 0 w Ill _J 0 ct 0.. I-0 0 0:: I-0.. cfs 0.00 0.41 1.03 1.52 2.15 2.71 3.11 3.38 3.48 3.45 3.31 3.10 2.83 2.52 2.18 1.77 1.33 0.98. 0.62 0.18 0.05 3.5 D.A. # ..... )( w 3.6 6.8 cfs 0.0 0.5 1.1 1.6 2.1 2.7 3.2 3.5 3.3 3.0 2.7 2.5 2.2 1.9 1.7 1.4 1.1 Q.9. 0.6 0.3 0.1 3.5 10720002-dra.xls Exhibit D-1 0 z _J I= ~ !1 0 >< I-w cfs 0.00 0.53 1.07 1.60 2.13 2.66 3.20 3.54 3.27 3.00 2.74 2.47 2.20 1.94 1.67 1.41 1.14 0.87 0.61 0.34 0.07 3.5 D.A.# D.A.# D.A. # 'II: .s::. 0 a. w f! z Cl iii e ~ "ti >. 0 :I: .... N 0 Qp 2.6 2.4 Tc 6.1 5.0 inc 1.0 2.0 Time cfs cfs 0.0 0.0 0.0 0.0 1.0 0.4 0.5 0.9 2.0 0.9 1.0 1.8 3.0 1.3 1.5 2.7 4.0 1.7 2.0 3.7 5.0 2.1 2.4 4.6 6.0 2.6 2.2 4.8 7.0 2.4 2.0 4.4 8.0 2.2 1.7 3.9 9.0 2.0 1.5 3.4 10.0 1.8 1.2 3.0 11.0 1.5 1.0 2.5 12.0 1.3 0.7 2.1 13.0 1.1 0.5 1.6 14.0 0.9 0.2 1.1 15.0 0.7 0.0 0.7 16.0 0.5 0.0 0.5 17.0 0.3 0.0 0.3 18.0 0.0 0.0 0.0 19.0 0.0 0.0 0.0 20.0 0.0 0.0 0.0 PEAK FLOWS 2.6 2.4 4.8 0.00 indicates inital condition EXHIBIT "D-1" PROPOSED DETENTION POND ROUTING Edelweiss Business Center, Lot 5, Block 4 Pond Routing EVENT= 25 D.A. # c: a + c: ~ c: .S! .... ~ + + "O ti c: .... + c: + c: > II) II) c: 0 .!! .= N N a 0.. w .., 0.5 5.0 cfs cfs cfs cfs ft cfs 0.92 0.00 0.00 0.00 332.2 0.0 2.75 0.19 0.92 0.36 332.4 0.1 4.58 1.10 2.94 0.92 332.5 0.2 6.41 2.89 5.68 1.39 332.6 0.3 8.24 5.32 9.30 1.99 332.8 0.4 9.34 8.54 13.56 2.51 332.9 0.5 9.11 11.80 17.88 3.04 332.9 0.5 8.24 14.11 20.91 3.40 333.0 0.4 7.33 15.23 22.35 3.56 333.0 0.4 6.41 15.39 22.56 3.58 333.0 0.3 5.50 14.80 21.81 3.50 333.0 0.3 4.58 13.64 20.30 3.33 333.0 0.2 3.67 12.06 18.22 3.08 333.0 0.2 2.75 10.18 15.73 2.77 332.9 0.1 1.84 8.07 12.93 2.43 332.8 0.1 1.17 5.78 9.91 2.06 332.8 0.0 0.74 3.72 6.95 1.62 332.7 0.0 0.31 2.09 4.46 1.18 332.6 0.0 0.05 0.75 2.40 0.82 332.5 0.0 0.00 0.16 0.80 0.32 332.3 0.0 0.00 0.00 0.16 0.08 332.3 0.0 3.6 333.0 0.5 0 w II) ...J 0 ct 0.. I-0 0 0:: I-0.. cfs 0.00 0.46 1.12 1.69 2.39 3.01 3.49 3.80 3.91 3.88 3.75 3.53 3.23 2.87 2.48 2.06 1.62 1.18 0.82 0.32 0.08 3.9 D.A. # .... )( w 4.1 6.8 cfs 0.0 0.6 1.2 1.8 2.4 3.0 3.6 4.0 3.7 3.4 3.1 2.8 2.5 2.2 1.9 1.6 1.3 1.0 0.7 0.4 0.1 4.0 10720002--0ra.xls Exhibit D-1 (!) z ...J J= ~ !!? OX I-w cfs 0.00 0.61 1.21 1.82 2.43 3.04 3.64 4.03 3.73 3.42 3.12 2.82 2.51 2.21 1.91 1.60 1.30 1.00 0.69 0.39 0.08 4.0 D.A. # D.A.# O.A.# 'It ~ 0 0.. w f! z Cl iii e :=;: "C >-0 :I: .... N 0 Qp 2.9 2.7 Tc 6.1 5.0 inc 1.0 2.0 Time cfs cfs 0.0 0.0 0.0 0.0 1.0 0.5 0.5 1.0 2.0 1.0 1.1 2.1 3.0 1.4 1.6 3.1 4.0 1.9 2.2 4.1 5.0 2.4 2.7 5.2 6.0 2.9 2.5 5.4 7.0 2.7 2.2 4.9 8.0 2.5 1.9 4.4 9.0 2.2 1.6 3.9 10.0 2.0 1.4 3.4 11.0 1.7 1.1 2.8 12.0 1.5 0.8 2.3 13.0 1.3 0.5 1.8 14.0 1.0 0.3 1.3 15.0 0.8 0.0 0.8 16.0 0.5 0.0 0.5 17.0 0.3 0.0 0.3 18.0 0.1 0.0 0.1 19.0 0.0 0.0 0.0 20.0 0.0 0.0 0.0 PEAK FLOWS 2.9 2.7 5.4 0.00 indicates inital condition EXHIBIT "D-1" PROPOSED DETENTION POND ROUTING Edelweiss Business Center, Lot 5, Block 4 Pond Routing EVENT= 50 D.A. # c a t. c c '.!:? .S! .... 2 + .... "C 10 c + .... + '.!:? c + c > I/) I/) c 0 .!! .E N N a D.. w ... 0.6 5.0 cfs cfs cfs cfs ft cfs 1.03 0.00 0.00 0.00 332.2 0.0 3.10 0.22 1.03 0.40 332.4 0.1 5.16 1.35 3.32 0.98 332.6 0.2 7.22 3.43 6.51 1.54 332.7 0.3 9.29 6.35 10.66 2.15 332.8 0.5 10.53 10.11 15.64 2.76 332.9 0.6 10.27 13.89 20.64 3.37 333.0 0.5 9.30 16.65 24.17 3.76 333.1 0.5 8.26 18.04 25.94 3.95 333.1 0.4 7.23 18.31 26.30 3.99 333.1 0.3 6.20 17.72 25.54 3.91 333.1 0.3 5.17 16.46 23.92 3.73 333.1 0.2 4.14 14.66 21.63 3.48 333.0 0.2 3.10 12.50 18.80 3.15 333.0 0.1 2.07 10.09 15.61 2.76 332.9 0.1 1.31 7.49 12.16 2.34 332.8 0.0 0.83 4.95 8.80 1.93 332.8 0.0 0.35 2.96 5.78 1.41 332.6 0.0 0.05 1.34 3.31 0.98 332.6 0.0 0.00 0.32 1.40 0.54 332.4 0.0 0.00 0.04 0.32 0.14 332.3 0.0 4.0 333.1 0.6 0 w I/) ..J 0 ct D.. I-0 0 0:: I-D.. cfs 0.00 0.52 1.21 1.88 2.60 3.33 3.88 4.21 4.35 4.33 4.19 3.96 3.65 3.26 2.81 2.34 1.93 1.41 0.98 0.54 0.14 4.3 D.A.# .... )( w 4.6 6.8 cfs 0.0 0.7 1.4 2.1 2.7 3.4 4.1 4.5 4.2 3.9 3.5 3.2 2.8 2.5 2.2 1.8 1.5 1.1 0.8 0.4 0.1 4.5 10720002-<lra.xls Exhibit D-1 (!) z ..J ~ ~ !!1 0 >< I-w cfs 0.00 0.69 1.37 2.06 2.74 3.43 4.11 4.55 4.21 3.86 3.52 3.18 2.84 2.49 2.15 1.81 1.47 1.12 0.78 0.44 0.10 4.5 D.A. # D.A. # D.A.# 'II: J:. 0 0. w !! z Cl iii e == "O >. 0 J: .... .... (.) Qp 3.3 3.1 Tc 6.1 5.0 inc 1.0 2.0 Time cfs cfs 0.0 0.0 0.0 0.0 1.0 0.5 0.6 1.2 2.0 1.1 1.2 2.3 3.0 1.6 1.8 3.5 4.0 2.2 2.5 4.6 5.0 2.7 3.1 5.8 6.0 3.2 2.8 6.0 7.0 3.0 2.5 5.5 8.0 2.8 2.2 4.9 9.0 2.5 1.8 4.3 10.0 2.2 1.5 3.8 11.0 2.0 1.2 3.2 12.0 1.7 0.9 2.6 13.0 1.4 0.6 2.0 14.0 1.1 0.3 1.4 15.0 0.9 0.0 0.9 16.0 0.6 0.0 0.6 17.0 0.3 0.0 0.3 18.0 0.1 0.0 0.1 19.0 0.0 0.0 0.0 20.0 0.0 0.0 0.0 PEAK FLOWS 3.2 3.1 6.0 0.00 indicates inital condition EXHIBIT "D-1" PROPOSED DETENTION POND ROUTING Edelweiss Business Center, Lot 5, Block 4 Pond Routing EVENT= 100 D.A. # c: a t. c: c: :!;! .!2 + 2 .... "O IV c: + .... + :!;! c: + c: > II) II) c: 0 ..! c: .... .... a D.. w .., 0.6 5.0 cfs cfs cfs cfs ft cfs 1.16 0.00 0.00 0.00 332.2 0.0 3.47 0.26 1.16 0.45 332.4 0.1 5.78 1.61 3.72 1.05 332.6 0.3 8.09 4.01 7.39 1.69 332.7 0.4 10.40 7.44 12.10 2.33 332.8 0.5 11.79 11.78 17.84 3.03 332.9 0.6 11.50 16.18 23.56 3.69 333.0 0.6 10.41 19.39 27.68 4.14 333.1 0.5 9.25 21.05 29.80 4.38 333.1 0.4 8.10 21.44 30.31 4.43 333.2 0.4 6.94 20.85 29.54 4.35 333.1 0.3 5.79 19.48 27.79 4.16 333.1 0.3 4.63 17.51 25.27 3.88 333.1 0.2 3.48 15.07 22.14 3.54 333.0 0.1 2.32 12.31 18.54 3.12 333.0 0.1 1.47 9.35 14.63 2.64 332.9 0.0 0.93 6.48 10.82 2.17 332.8 0.0 0.39 4.02 7.41 1.70 332.7 0.0 0.06 2.06 4.41 1.17 332.6 0.0 0.00 0.57 2.12 0.78 332.5 0.0 0.00 0.10 0.57 0.23 332.3 0.0 4.4 333.2 0.6 0 w II) ...J 0 c( D.. I-0 0 0:: I-D.. cfs 0.00 0.58 1.31 2.07 2.83 3.66 4.26 4.65 4.82 4.81 4.66 4.41 4.07 3.66 3.18 2.64 2.17 1.70 1.17 0.78 0.23 4.8 D.A.# .... )( w 5.2 6.8 cfs 0.0 0.8 1.5 2.3 3.1 3.8 4.6 5.1 4.7 4.3 3.9 3.6 3.2 2.8 2.4 2.0 1.6 1.3 0.9 0.5 0.1 5.1 10720002-dra.xls Exhibit D-1 C> ...J ~ ~ !!! 0 >< I-w cfs 0.00 0.77 1.54 2.30 3.07 3.84 4.61 5.10 4.72 4.33 3.95 3.56 3.18 2.80 2.41 2.03 1.64 1.26 0.88 0.49 0.11 5.1 Edelweiss Business Center, Lot 5, Block 4 5 Year Event Hydrograph 3 .00 2.50 2 .00 1.50 1.00 0 .50 0 .00+-~~~--+~~~~-+-~~~---;~~~~~..._~~~+---~~~-+~~~~+-~~~----1 0 .00 5.00 10.00 15.00 20 .00 Time(min.) 25.00 30.00 35.00 40.00 --TOTAL PROPOSED - - -TOTAL EXISTING 8/6/2004 Exhibit D-2 ~ Edelweiss Business Center, Lot 5, Block 4 10 Year Event Hydrograph 4.00 ~-----------------------------------~ 3 .50 3 .00 \ \ 2 .50 \ \ \ \ \ .!:.. 2.00 \ a 1.50 1.00 0.50 0.00 +------+-----+---------l------+"'-----------+-----+--------4 0 .00 5 .00 10.00 15.00 20 .00 Time (min .) 25 .00 30 .00 35.00 40 .00 --TOTAL PROPOSED - - -TOT AL EXISTING 8/6/2004 Exhibit D-2 E' ~ a Edelweiss Business Center, Lot 5, Block 4 25 Year Event Hydrograph 4 .50 -r--------------------------------------. 4 .00 3 .50 \ \ 3.00 \ \ \ 2 .50 \ 2.00 1.50 1.00 0.50 0 .00 +-----+-----f------+------+~---+-----+----+-------! 0 .00 5.00 10.00 15.00 20 .00 Time(min.) 25 .00 30.00 35 .00 40 .00 --TOTAL PROPOSED - - -TOTAL EXISTING 8/6/2004 Exhibit D-2 Edelweiss Business Center, Lot 5, Block 4 50 Year Event Hydrograph 5 .00 ...------------------------------------~ 4.50 4 .00 \ 3 .50 \ \ \ 3.00 \ \ \ ~ .!:!.. 2.50 \ a \ \ 2.00 1.50 1.00 0 .50 0 .00 +-------+-----+------+-------+-""""------------------! 0 .00 5.00 10.00 15.00 20 .00 Time(min.) 25 .00 30 .00 35.00 40 .00 --TOTAL PROPOSED - - -TOTAL EXIST ING 8/6/2004 Exhibit D-2 Edelweiss Business Center, Lot 5, Block 4 100 Year Event Hydrograph 6 .00 -.---------------------------------------. 5 .00 4.00 \ \ \ ~ ~ 3.00 \ \ a \ 2 .00 1.00 \ \ \ \ \ \ \ \ 0 .00 _.._----+-----i------+-------+'~----+-----+--------~ 0 .00 5.00 10.00 15.00 20 .00 Time(min.) 25 .00 30.00 35 .00 40 .00 --TOTAL PROPOSED -- -TOTAL EXISTING 8/6/2004 Exhibit D-2 4 :1 (max) CALCULATIONS COMPOSITE MANNING'S "n" = 0.02 AREA (1.0 ' depth) = 2.5 sq. ft. PERIMETER = 6.4 ft. HYDRAULIC RADIUS = 0 .393 ft. SLOPE = 1.0% Q= ~ (A)(R)2/3(s)1/2 "' Q= o~o~~ ( 2.5 )( 0.393) 2 / 3 ( 0 .01) 112 O=I 9 .99 cfs I 2·-0· 1·-0· "'w "' "l~ .;: .. ~ #3018" o.c. Flume Section EXHIBIT E Typical Flume Section and Calculations DRAINAGE REPORT FOR Lot 5, Block 4 Edelweiss Business Center S. Graham Road Vicinity Map (n.t.s.) AUGUST, 2004 Prepared By: McClure t Browne Engineering, Inc. 1008 Woodcreek Drive, Suite 103 College Station, Texas 77845 (979) 693-3838 DRAINAGE REPORT FOR Lot 5, Block 4 Edelweiss Business Center S. Graham Rood Vicinity Map (n .t.s.) AUGUST, 2004 Prepared By : McClure t Browne Engineering, Inc. 1008 Woodcreek Drive , Suite 103 College Station , Texas 77845 (979) 693 -3838 CERTIFICATION I, Michael R. McClure, Registered Professional Engineer No. 32740, State of Texas, certify that this report for the drainage design of the LOT 5, BLOCK 4, EDELWEISS BUSINESS CENTER, the DAVID PRICE HOMEBUILDERS Project, was prepared by me in accordance with the provisions of the City of College Station Drainage Policy and Design Standards for the owners thereof. DRAINAGE REPORT Lot 5, Block 4 , Edelweiss Business Center a/r,/~¢_ Michael R. McClure, P .E . # 32740 ~,,,,,,, --~~ OF "f~ \t -... ~ ••••••••• :.r~ •• ;<b'.··· * ···.-7~1ff, '* ... ·· .. *' 1*: ·*~ ~···································~ ~ .. Ml.9J:l.~.~-~.R~M99hV.fl!~.~ '?c;···~ 32740 ~.lt1 ., i~f.CJ.1.~!.'f.'r-~··~ ~ \\81 0NAL -;;_~--''\l .,,,,.- DRAINAGE REPORT INTRODUCTION LOCATION DESCRIPTION DRAINAGE BASIN TABLE OF CONTENTS STORM DRAIN DESIGN CRITERIA STORM DRAIN SYSTEM DESIGN DETENTION POND DESIGN CONCLUSION TABLE OF EXHIBITS EXCERPT FROM FLOOD INSURANCE RATE MAP EXISTING CONDITION DRAINAGE AREA MAP PROPOSED CONDITION DRAINAGE AREA MAP RATIONAL METHOD CALCULATIONS DETENTION POND ROUTING HYDROGRAPH PLOTS FLUME CAPACITY ANALYSIS DRAINA GE REPORT Lot 5, Block 4 Edelweiss Business Center 1 1 1 2 2 2 2 3 A B-1 B-2 C-1 D-1 D-2 E-1 11 INTRODUCTION STORM DRAINAGE REPORT Lot 5, Block 4 Edelweiss Business Center (David Price Homebuilders) College Station, Texas This study is intended to describe the effects upon the drainage system that result from the development of a 0.75-acre tract in the Edelweiss Business Center. It compares the existing and proposed conditions to show that improvements associated with the development do not cause adverse impacts on downstream properties. LOCATION The site is located in College Station, near the intersection of Rock Prairie Road and FM 2174 (Wellborn Road). The site is bounded by Rock Prairie Road to the South, property owned by Texas Hotel Corporation to the East, Lots 28-30 , Block 12 of Edelweiss Estates to the North and property owned by Moreau Family Investments Ltd. to the West. DESCRIPTION The portion of the site that is being developed covers approximately 0 .25-acres and is being developed as an office building and parking lot. The site is currently covered by pastureland consisting of native grass and brush. The sites drain to the south to the Rock Prairie Road drainage system. DRAINAG E REPOR T Pg. l Lot 5 , Block 4 Edelweiss Business Center DRAINAGE BASIN The site lies in the drainage basin of Lick Creek, which is a tributary of Carters Creek and the Navasota River. No part of the site is located in a 100-Year Flood Hazard Area according to the Flood Insurance Rate Maps for Brazos County, Texas and Incorporated Areas, Map No. 48041Cl82 C effective July 2, 1992 as prepared by the Federal Emergency Management Agency (See Exhibit A). STORM DRAIN DESIGN CRITERIA The proposed drainage system is designed in accordance with the City of College Station Drainage Policy and Design Standards (DPDS). The design storm for the underground system is a 10-year event, and flow calculations are based on the Rational Method. Pipe sizes were determined from Manning 's Equation using an "n" of 0.014. STORM DRAIN SYSTEM DESIGN Storm water from the proposed development will be captured in the parking lot curbs and conveyed to the curb opening located in the southeast comer of the site where it is detained slowly released into Rock Prairie Road. Exhibit C-1 gives the runoff calculations for the drainage areas. Inlet sizing computations are shown in Exhibit C-2, and Exhibit C-3 shows the pipe slope calculations based on Manning's equation. All computations use the parameters provided in the DPDS . DETENTION POND DESIGN The proposed detention pond is located in the southern end of the property. It consists of a 2' wide curb opening and a flume. The parking lot is being used for the storage volume necessary for DRAINAGE REPORT Pg . 2 Lot 5 , Block 4 Edelweiss Business Ce nter - the pond. The outlet for this pond is a 2 ' wide curb op erring . The pond discharges into the existing curb line of Rock Prairie Road. The pond was modeled for the 5, 10, 25 , 50, and 100-year storm events. The hydro logic analysis of the drainage system is shown in Exhibits D -1 and D-2. Exhibit D-1 shows the hydraulic draulic routing for the existing pond. ? routing for the detention pond. Exlnbit D-2 shows hy A summary of the combined drainage effects is shown below: Total Existing Event Proposed Condition Flowrate Flowrate 5 year 3 .2 cfs 3 .2 cfs 10 year 3.5 cfs 3.5 cfs 25 year 3.9 cfs 4.0 cfs 50 year 4.3 cfs 4.5 cfs 100 year 4.8 cfs 5.1 cfs TABLE 1 CONCLUSION The post-development flowrate is reduced to a level less than the pre-development flowrate for the 5, 10, 25 , 50, and 100-year events. The 100-ye ar event is contained in the ponds and released through the pond outlet devices. The drainage design for this site meets the requirements as stated in the City of College Station Drainage Policy and Desig n Standards. DRAINAG E REPOR T Pg. 3 Lot 5 , Bl ock 4 Edelweiss Bu sin ess Ce nt er N.T .S. Braws County Unincorporated Areas 481195 EXHIBIT A Flood Insurance Rate Mop Excerpt Brazos County , Te xas and Incorporated Areas Mop Numbers: 48041C0182C Effective Dote : JULY 2 , 1992 ~ 3: c 0 a:: w ..I ..I < ~ 0.. < u. w 0 I-c (!) a:: ..I j:: z < z < < w z w u :s ;c ..I ~~ w ::& ..I z c a:: I-~ ~ c;; w ~ w (!) > >z e z a:: w < e c ::> <[_ a:: 0.. o~ NO. AC. 0.4 0.55 0.9 ft. Ex1 0.90 0.90 0.00 0.00 0.36 355.0 1 0.55 0.55 0.00 0.00 0.22 271.0 2 0.25 0.06 0.00 0.19 0.20 93.0 3 0.10 0.10 0.00 0.00 0.04 71.0 EXHIBIT C-1 Rational Formula Drainage Area Calculations Edelweiss Business Center, Lot 5, Block 4 3: 0 3: ~ ..I u. 0 c ..I ..I z u. u. ~ :s a:: ;c a:: u w I-w u I-u I-a:: ..I I= (!) I= ..I 0 u w ..I ::> z ::> ..I ..I w >< ~ ii (/) a II) 0 u. (!) ~ (!) ~ u ::> t! !!! a ft. ft. ft. ft/s min min In/Hr cfs In/Hr cfs 5.0 1.0 1.0 0.8 7.1 7.1 7.31 2.6 8.8 3.2 3.0 1.0 1.0 0.7 6.1 6.1 7.71 1.7 9.3 2.0 1.0 64.0 1.0 1.0 2.5 5.0 8.22 1.6 9.9 1.9 1.0 1.0 1.0 0.8 1.4 5.0 8.22 0.3 9.9 0.4 0 II) 0 ... II) N ... a N a In/Hr cfs In/Hr cfs 9.9 3.5 11.2 4.0 10.4 2.3 11.8 2.6 11.0 2.1 12.5 2.4 11.0 0.4 12.5 0.5 0 !?i II) a In/Hr cfs 12.7 4.6 13.3 2.9 14.1 2.7 14.1 0.6 0 8 0 ... ... a In/Hr cfs 14.2 5.1 14.9 3.3 15.8 3.1 15.8 0.6 8/6/2004 10720002-dra.xls Exhibit C-1 D.A.# D.A. # D.A.# "*' ~ 0 Q. w f? Cl z ~ iii ~ "O >-0 J: .... N 0 Qp 2.0 1.9 Tc 6.1 5.0 inc 1.0 2.0 Time cfs cfs 0.0 0.0 0.0 0.0 1.0 0.3 0.4 0.7 2.0 0.7 0.8 1.4 3.0 1.0 1.2 2.2 4.0 1.3 1.5 2.9 5.0 1.7 1.9 3.6 6.0 2.0 1.7 3.7 7.0 1.9 1.5 3.4 8.0 1.7 1.3 3.1 9.0 1.5 1.2 2.7 10.0 1.4 1.0 2.3 11.0 1.2 0.8 2.0 12.0 1.0 0.6 1.6 13.0 0.9 0.4 1.3 14.0 0.7 0.2 0.9 15.0 0.5 0.0 0.5 16.0 0.4 0.0 0.4 17.0 0.2 0.0 0.2 18.0 0.0 0.0 0.0 19.0 0.0 0.0 0.0 20.0 0.0 0.0 0.0 PEAK FLOWS 2.0 1.9 3.7 0.00 indicates inital condition EXHIBIT "D-1" PROPOSED DETENTION POND ROUTING Edelweiss Business Center, Lot 5, Block 4 Pond Routing EVENT= 5 D.A. # c: a t. c: c: .... 2 ~ .2 + .... .... "O 1U c: ~ + + c: > + c: Cl) Cl) c: 0 .!! c: N N a 11. w .., 0.4 5.0 cfs cfs cfs cfs ft cfs 0.72 0.00 0.00 0.00 332.2 0.0 2.16 0.14 0.72 0.29 332.3 0.1 3.60 0.69 2.30 0.81 332.5 0.2 5.04 1.98 4.29 1.15 332.6 0.2 6.48 3.77 7.03 1.63 332.7 0.3 7.34 6.04 10.25 2.10 332.8 0.4 7.17 8.41 13.39 2.49 332.9 0.4 6.48 10.07 15.58 2.76 332.9 0.3 5.76 10.80 16.55 2.87 332.9 0.3 5.04 10.82 16.57 2.88 332.9 0.2 4.32 10.28 15.86 2.79 332.9 0.2 3.60 9.33 14.61 2.64 332.9 0.2 2.88 8.07 12.94 2.43 332.8 0.1 2.16 6.58 10.96 2.19 332.8 0.1 1.44 4.90 8.74 1.92 332.8 0.0 0.92 3.33 6.35 1.51 332.7 0.0 0.58 1.95 4.24 1.14 332.6 0.0 0.24 0.84 2.53 0.85 332.5 0.0 0.04 0.24 1.08 0.42 332.4 0.0 0.00 0.03 0.28 0.12 332.3 0.0 0.00 0.00 0.03 0.02 332.2 0.0 2.9 332.9 0.4 0 w Cl) ...J 0 c( 11. I-0 0 0:: I-11. cfs 0.00 0.37 0.96 1.39 1.94 2.50 2.84 3.07 3.15 3.11 2.99 2.79 2.55 2.27 1.96 1.51 1.14 0.85 0.42 0.12 0.02 3.2 D.A. # .... )( w 3.2 6.8 cfs 0.0 0.5 1.0 1.4 1.9 2.4 2.9 3.2 2.9 2.7 2.4 2.2 2.0 1.7 1.5 1.3 1.0 0.8 0.5 0.3 0.1 3.2 10720002-<lra.xls Exhibit D-1 C) ...J z c( ~ I-!!! OX I-w cfs 0.00 0.48 0.95 1.43 1.91 2.38 2.86 3.16 2.93 2.69 2.45 2.21 1.97 1.73 1.50 1.26 1.02 0.78 0.54 0.30 0.07 3.2 D.A.# D.A.# D.A.# :a: .r:. 0 Q. w !! z C> ~ iii ::iE "O >-0 :I: .... N 0 Qp 2.3 2.1 Tc 6.1 5.0 inc 1.0 2.0 Time cfs cfs 0.0 0.0 0.0 0.0 1.0 0.4 0.4 0.8 2.0 0.8 0.9 1.6 3.0 1.1 1.3 2.4 4.0 1.5 1.7 3.2 5.0 1.9 2.1 4.0 6.0 2.3 1.9 4.2 7.0 2.1 1.7 3.8 8.0 1.9 1.5 3.4 9.0 1.7 1.3 3.0 10.0 1.5 1.1 2.6 11.0 1.4 0.9 2.2 12.0 1.2 0.6 1.8 13.0 1.0 0.4 1.4 14.0 0.8 0.2 1.0 15.0 0.6 0.0 0.6 16.0 0.4 0.0 0.4 17.Q 02 (l.O. 0.2. 18.0 0.0 0.0 0.0 19.0 0.0 0.0 0.0 20.0 0.0 0.0 0.0 PEAK FLOWS 2.3 2.1 4.2 0.00 indicates inital condition EXHIBIT "D-1" PROPOSED DETENTION POND ROUTING Edelweiss Business Center, Lot 5, Block 4 Pond Routing EVENT= 10 D.A.# c CJ + c ~ c .... q 0 + + "'C ~ c ~ .... + c + c > I/) I/) c 0 .!! E N N CJ Q. w .., 0.4 5.0 cfs cfs cfs cfs ft cfs 0.80 0.00 0.00 0.00 332.2 0.0 2.41 0.16 0.80 0.32 332.3 0.1 4.02 0.87 2.57 0.85 332.5 0.2 5.62 2.37 4.88 1.26 332.6 0.3 7.23 4.40 7.99 1.80 332.7 0.4 8.19 7.08 11.63 2.27 332.8 0.4 8.00 9.84 15.28 2.72 332.9 0.4 7.23 11.77 17.84 3.03 332.9 0.4 6.43 12.66 19.01 3.17 333.0 0.3 5.63 12.72 19.09 3.18 333.0 0.3 4.83 12.16 18.35 3.09 333.0 0.2 4.02 11.13 16.99 2.93 332.9 0.2 3.22 9.75 15.15 2.70 332.9 0.1 2.42 8.09 12.96 2.44 332.8 0.1 1.61 6.24 10.51 2.14 332.8 0.0 1.02 4.31 7.85 1.77 332.7 0.0 0.65 2.66 5.33 1.33 332.6 0.0 Q.21 .. 1..34. 3.3.1 0.98.. 332.6. O.Q 0.04 0.38 1.62 0.62 332.5 0.0 0.00 0.06 0.42 0.18 332.3 0.0 0.00 0.00 0.06 0.05 332.3 0.0 3.2 333.0 0.4 0 w I/) ...I 0 ~~ 0 0:: I-Q. cfs 0.00 0.41 1.03 1.52 2.15 2.71 3.11 3.38 3.48 3.45 3.31 3.10 2.83 2.52 2.18 1.77 1.33 0.98. 0.62 0.18 0.05 3.5 D.A.# .... >< w 3.6 6.8 cfs 0.0 0.5 1.1 1.6 2.1 2.7 3.2 3.5 3.3 3.0 2.7 2.5 2.2 1.9 1.7 1.4 1.1 0.9 0.6 0.3 0.1 3.5 10720002-<lra.xls Exhibit D-1 0 ...I~ ~ !1 0 >< I-w cfs 0.00 0.53 1.07 1.60 2.13 2.66 3.20 3.54 3.27 3.00 2.74 2.47 2.20 1.94 1.67 1.41 1.14 0.87 0.61 0.34 0.07 3.5 D.A. # D.A. # D.A.# 'It: ~ 0 a. w l! z Cl iii e ::!: "'C >-0 :J: ... N 0 Qp 2.6 2.4 Tc 6.1 5.0 inc 1.0 2.0 Time cfs cfs 0.0 0.0 0.0 0.0 1.0 0.4 0.5 0.9 2.0 0.9 1.0 1.8 3.0 1.3 1.5 2.7 4.0 1.7 2.0 3.7 5.0 2.1 2.4 4.6 6.0 2.6 2.2 4.8 7.0 2.4 2.0 4.4 8.0 2.2 1.7 3.9 9.0 2.0 1.5 3.4 10.0 1.8 1.2 3.0 11.0 1.5 1.0 2.5 12.0 1.3 0.7 2.1 13.0 1.1 0.5 1.6 14.0 0.9 0.2 1.1 15.0 0.7 0.0 0.7 16.0 0.5 0.0 0.5 17.0 0.3 0.0 0.3 18.0 0.0 0.0 0.0 19.0 0.0 0.0 0.0 20.0 0.0 0.0 0.0 PEAK FLOWS 2.6 2.4 4.8 0.00 indicates inital condition EXHIBIT "D-1" PROPOSED DETENTION POND ROUTING Edelweiss Business Center, Lot 5, Block 4 Pond Routing EVENT= 25 D.A.# c CJ + c ~ c 0 ... q "'C ~ + ... c ~ + ... + c + c > (/) (/) c 0 .!! c N N CJ 0.. w .., 0.5 5.0 cfs cfs cfs cfs ft cfs 0.92 0.00 0.00 0.00 332.2 0.0 2.75 0.19 0.92 0.36 332.4 0.1 4.58 1.10 2.94 0.92 332.5 0.2 6.41 2.89 5.68 1.39 332.6 0.3 8.24 5.32 9.30 1.99 332.8 0.4 9.34 8.54 13.56 2.51 332.9 0.5 9.11 11.80 17.88 3.04 332.9 0.5 8.24 14.11 20.91 3.40 333.0 0.4 7.33 15.23 22.35 3.56 333.0 0.4 6.41 15.39 22.56 3.58 333.0 0.3 5.50 14.80 21.81 3.50 333.0 0.3 4.58 13.64 20.30 3.33 333.0 0.2 3.67 12.06 18.22 3.08 333.0 0.2 2.75 10.18 15.73 2.77 332.9 0.1 1.84 8.07 12.93 2.43 332.8 0.1 1.17 5.78 9.91 2.06 332.8 0.0 0.74 3.72 6.95 1.62 332.7 0.0 0.31 2.09 4.46 1.18 332.6 0.0 0.05 0.75 2.40 0.82 332.5 0.0 0.00 0.16 0.80 0.32 332.3 0.0 0.00 0.00 0.16 0.08 332.3 0.0 3.6 333.0 0.5 0 w (/) _J 0 ct 0.. I-0 0 a: I-0.. cfs 0.00 0.46 1.12 1.69 2.39 3.01 3.49 3.80 3.91 3.88 3.75 3.53 3.23 2.87 2.48 2.06 1.62 1.18 0.82 0.32 0.08 3.9 D.A.# ... )( w 4.1 6.8 cfs 0.0 0.6 1.2 1.8 2.4 3.0 3.6 4.0 3.7 3.4 3.1 2.8 2.5 2.2 1.9 1.6 1.3 1.0 0.7 0.4 0.1 4.0 10720002-<lra.xls Exhibit D-1 C) _J z ct I= I-!1 ox I-w cfs 0.00 0.61 1.21 1.82 2.43 3.04 3.64 4.03 3.73 3.42 3.12 2.82 2.51 2.21 1.91 1.60 1.30 1.00 0.69 0.39 0.08 4.0 D.A.# D.A.# D.A. # 'II: s:. c c. w f! z Cl iii 0 ... :::!! ,, >. 0 ::c .... N 0 Qp 2.9 2.7 Tc 6.1 5.0 inc 1.0 2.0 Time cfs cfs 0.0 0.0 0.0 0.0 1.0 0.5 0.5 1.0 2.0 1.0 1.1 2.1 3.0 1.4 1.6 3.1 4.0 1.9 2.2 4.1 5.0 2.4 2.7 5.2 6.0 2.9 2.5 5.4 7.0 2.7 2.2 4.9 8.0 2.5 1.9 4.4 9.0 2.2 1.6 3.9 10.0 2.0 1.4 3.4 11.0 1.7 1.1 2.8 12.0 1.5 0.8 2.3 13.0 1.3 0.5 1.8 14.0 1.0 0.3 1.3 15.0 0.8 0.0 0.8 16.0 0.5 0.0 0.5 17.0 0.3 0.0 0.3 18.0 0.1 0.0 0.1 19.0 0.0 0.0 0.0 20.0 0.0 0.0 0.0 PEAK FLOWS 2.9 2.7 5.4 0.00 indicates inital condition EXHIBIT "D-1" PROPOSED DETENTION POND ROUTING Edelweiss Business Center, Lot 5, Block 4 Pond Routing EVENT= 50 D.A.# c: a ~ c: c: .2 .... ~ + .... .... ,, 1V c: + + c: + c: > VI VI c: 0 .!! c: N N a Q. w .., 0.6 5.0 cfs cfs cfs cfs ft cfs 1.03 0.00 0.00 0.00 332.2 0.0 3.10 0.22 1.03 0.40 332.4 0.1 5.16 1.35 3.32 0.98 332.6 0.2 7.22 3.43 6.51 1.54 332.7 0.3 9.29 6.35 10.66 2.15 332.8 0.5 10.53 10.11 15.64 2.76 332.9 0.6 10.27 13.89 20.64 3.37 333.0 0.5 9.30 16.65 24.17 3.76 333.1 0.5 8.26 18.04 25.94 3.95 333.1 0.4 7.23 18.31 26.30 3.99 333.1 0.3 6.20 17.72 25.54 3.91 333.1 0.3 5.17 16.46 23.92 3.73 333.1 0.2 4.14 14.66 21.63 3.48 333.0 0.2 3.10 12.50 18.80 3.15 333.0 0.1 2.07 10.09 15.61 2.76 332.9 0.1 1.31 7.49 12.16 2.34 332.8 0.0 0.83 4.95 8.80 1.93 332.8 0.0 0.35 2.96 5.78 1.41 332.6 0.0 0.05 1.34 3.31 0.98 332.6 0.0 0.00 0.32 1.40 0.54 332.4 0.0 0.00 0.04 0.32 0.14 332.3 0.0 4.0 333.1 0.6 0 w VI _J 0 c( Q. I-0 0 0:: I-Q. cfs 0.00 0.52 1.21 1.88 2.60 3.33 3.88 4.21 4.35 4.33 4.19 3.96 3.65 3.26 2.81 2.34 1.93 1.41 0.98 0.54 0.14 4.3 D.A.# .... )( w 4.6 6.8 cfs 0.0 0.7 1.4 2.1 2.7 3.4 4.1 4.5 4.2 3.9 3.5 3.2 2.8 2.5 2.2 1.8 1.5 1.1 0.8 0.4 0.1 4.5 10720002-<lra.xls Exhibit D-1 (!) _J z c( I= I-!!! ox I-w cfs 0.00 0.69 1.37 2.06 2.74 3.43 4.11 4.55 4.21 3.86 3.52 3.18 2.84 2.49 2.15 1.81 1.47 1.12 0.78 0.44 0.10 4.5 D.A.# D.A.# D.A.# 'II: .t: 0 c. w I? z Cl iii 0 .... == "O >-0 :I: ..... N 0 Qp 3.3 3.1 Tc 6.1 5.0 inc 1.0 2.0 Time cfs cfs 0.0 0.0 0.0 0.0 1.0 0.5 0.6 1.2 2.0 1.1 1.2 2.3 3.0 1.6 1.8 3.5 4.0 2.2 2.5 4.6 5.0 2.7 3.1 5.8 6.0 3.2 2.8 6.0 7.0 3.0 2.5 5.5 8.0 2.8 2.2 4.9 9.0 2.5 1.8 4.3 10.0 2.2 1.5 3.8 11.0 2.0 1.2 3.2 12.0 1.7 0.9 2.6 13.0 1.4 0.6 2.0 14.0 1.1 0.3 1.4 15.0 0.9 0.0 0.9 16.0 0.6 0.0 0.6 17.0 0.3 0.0 0.3 18.0 0.1 0.0 0.1 19.0 0.0 0.0 0.0 20.0 0.0 0.0 0.0 PEAK FLOWS 3.2 3.1 6.0 0.00 indicates inital condition EXHIBIT "D-1" PROPOSED DETENTION POND ROUTING Edelweiss Business Center, Lot 5, Block 4 Pond Routing EVENT= 100 D.A.# c: a t. c: c: :!;? .51 ..... 2 + + ..... "O Oi c: + :!;? c: + c: > Cl) IC c: 0 .!! c: N a 0. w .., 0.6 5.0 cfs cfs cfs cfs ft cfs 1.16 0.00 0.00 0.00 332.2 0.0 3.47 0.26 1.16 0.45 332.4 0.1 5.78 1.61 3.72 1.05 332.6 0.3 8.09 4.01 7.39 1.69 332.7 0.4 10.40 7.44 12.10 2.33 332.8 0.5 11.79 11.78 17.84 3.03 332.9 0.6 11.50 16.18 23.56 3.69 333.0 0.6 10.41 19.39 27.68 4.14 333.1 0.5 9.25 21.05 29.80 4.38 333.1 0.4 8.10 21.44 30.31 4.43 333.2 0.4 6.94 20.85 29.54 4.35 333.1 0.3 5.79 19.48 27.79 4.16 333.1 0.3 4.63 17.51 25.27 3.88 333.1 0.2 3.48 15.07 22.14 3.54 333.0 0.1 2.32 12.31 18.54 3.12 333.0 0.1 1.47 9.35 14.63 2.64 332.9 0.0 0.93 6.48 10.82 2.17 332.8 0.0 0.39 4.02 7.41 1.70 332.7 0.0 0.06 2.06 4.41 1.17 332.6 0.0 0.00 0.57 2.12 0.78 332.5 0.0 0.00 0.10 0.57 0.23 332.3 0.0 4.4 333.2 0.6 0 w Cl) ..J 0 ~ 0. I-0 0 a: I-0. cfs 0.00 0.58 1.31 2.07 2.83 3.66 4.26 4.65 4.82 4.81 4.66 4.41 4.07 3.66 3.18 2.64 2.17 1.70 1.17 0.78 0.23 4.8 D.A.# ..... )( w 5.2 6.8 cfs 0.0 0.8 1.5 2.3 3.1 3.8 4.6 5.1 4.7 4.3 3.9 3.6 3.2 2.8 2.4 2.0 1.6 1.3 0.9 0.5 0.1 5.1 10720002-dra.xls Exhibit D-1 0 ..J ~ ~ !!! OX I-w cfs 0.00 0.77 1.54 2.30 3.07 3.84 4.61 5.10 4.72 4.33 3.95 3.56 3.18 2.80 2.41 2.03 1.64 1.26 0.88 0.49 0.11 5.1 Edelweiss Business Center, Lot 5, Block 4 100 Year Event Hydrograph 6 .00 -..--------------------------------------. 5 .00 4.00 \ \ \ -J!! \ ~ 3 .00 \ \ a \ 2 .00 1.00 \ \ \ \ \ \ \ \ \ \ 0 .00 ~----4--------"-----+------+'.........,,------------1------1 0 .00 5 .00 10.00 15.00 20 .00 Time(min.) 25 .00 30.00 35.00 40 .00 --TOTAL PROPOSED - - -TOTAL EXIST ING 8/6/2004 Exhibit D-2 Edelweiss Business Center, Lot 5, Block 4 100 Year Event Hydrograph 6 .00 -.------------------------------------...., 5 .00 4 .00 \ \ \ \ ~ ~ 3 .00 \ \ a 2 .00 1.00 \ \ \ \ \ \ \ \ 0 .00 +------+-----f------+------+'.'-..........::----+-----+----+-----~ 0 .00 5.00 10 .00 15.00 20 .00 Time(min.) 25 .00 30 .00 35 .00 40 .00 --TOTAL PROPOSED - - -TOTAL EXISTING 81612004 Exhibit D-2 Edelweiss Business Center, Lot 5, Block 4 50 Year Event Hydrograph 5 .00 -r-------------------------------------. 4 .50 4 .00 \ 3 .50 \ \ \ 3 .00 \ \ \ ~ ~ 2 .50 \ a 2 .00 1.50 1.00 0.50 0 .00 _.,_ ___ ---+-____ .__ ___ ....._ ___ ----+--"""'------------------....._---~ 0 .00 5 .00 10.00 15.00 20 .00 Time(min.) 25 .00 30.00 35.00 40.00 --TOTAL PROPOSED - - -TOTAL EXISTING 8/6/2004 Exhibit D-2 Edelweiss Business Center, Lot 5, Block 4 50 Year Event Hydrograph 5 .00 ...-------------------------------------. 4 .50 4 .00 3 .50 3.00 l A " l \ \ \ \ \ \ \ ~ .!:!.. 2 .50 \ a \ \ 2.00 1.50 1.00 0 .50 0 .00 +-----+----+------+------+--"""----+-----+----+-----~ 0.00 5.00 10.00 15.00 20.00 Time(min.) 25 .00 30.00 35.00 40.00 --TOTAL PROPOSED - - -TOTAL EXISTING 8/6/2004 Exhibit D-2 Edelweiss Business Center, Lot 5, Block 4 25 Year Event Hydrograph 4 .50 -.--------------------------------------. 4 .00 3.50 \ \ 3.00 \ \ \ 2.50 \ \ \ \ \ 2.00 1.50 1.00 0.50 0.00 -f-------+-----+------+-------+-"""------+------+----+-----~ 0 .00 5 .00 10.00 15.00 20.00 Time(min.) 25 .00 30.00 35.00 40 .00 --TOTAL PROPOSED -- -TOTAL EXISTING 8/6/2004 Exhibit D-2 ~ ~ a Edelweiss Business Center, Lot 5, Block 4 25 Year Event Hydrograph 4 .50 ......------------------------------------. 4 .00 3 .50 \ \ 3 .00 \ \ \ 2 .50 \ 2 .00 1.50 1.00 0 .50 0 .00 -J--------+-----~----+--------+-""-------------+-----+------1 0 .00 5 .00 10.00 15.00 20.00 Time(min.) 25 .00 30 .00 35 .00 40.00 --TOTAL PROPOSED - - -TOTAL EXISTING 8/6/2004 Exhibit D-2 Edelweiss Business Center, Lot 5, Block 4 10 Year Event Hydrograph 4 .00 -..------------------------------------~ 3 .50 3 .00 \ \ \ 2.50 \ \ \ ~ ~ 2 .00 ' \ a 1.50 1.00 0 .50 0 .00 +------+-----f-------+---------+,___ ________ -+----+------! 0 .00 5 .00 10.00 15 .00 20.00 Time(min.) 25.00 30.00 35.00 40.00 --TOTAL PROPOSED -- -TOTAL EXISTING 81612004 Exhibit D-2 Edelweiss Business Center, Lot 5, Block 4 10 Year Event Hydrograph 3 .50 3 .00 \ 2 .50 \ \ ~ ~ 2 .00 a \ \ \ 1.50 1.00 0 .50 o .oo~~~~-+~~~~-+-~~~-----4~~~~-+>...__~~~+-~~~--+~~~~+-~~~--1 0 .00 5 .00 10.00 15 .00 20.00 Time(min.) 25.00 30.00 35.00 40.00 --TOTAL PROPOSED - - -TOTAL EXISTING 8/6/2004 Exhibit D-2 Edelweiss Business Center, Lot 5, Block 4 5 Year Event Hydrograph 3 .00 2 .50 \ 2 .00 1.50 1.00 0 .50 0 .00-f-~~~---+~~~~-+-~~~___,f--~~~__,......__~~~+-~~~-+~~~~--~~~--! 0.00 5.00 10 .00 15.00 20 .00 Time(min.) 25 .00 30.00 35 .00 40 .00 --TOTAL PROPOSED - - -TOTAL EXISTING 8/6/2004 Exhibit D-2 Edelweiss Business Center, Lot 5, Block 4 5 Year Event Hydrograph 3 .50 -.--------------------------------------. 3 .00 2.50 \ \ 2 .00 \ \ \ \ 1.50 \ 1.00 0 .50 0 .00 .J-------+-----l-------+-------'l'....._ ___ -+--___ --+-________ ~ 0.00 5.00 10.00 15.00 20 .00 Time(min.) 25 .00 30.00 35.00 40 .00 --TOTAL PROPOSED ---TOTAL EXISTING 8/6/2004 Exhibit D-2 "' 'V 4 :1 (max) CALCULATIONS COMPOSITE MANNING 'S "n" = 0.02 AREA (1.0' depth) = 2 .5 sq. ft. PERIMETER = 6.4 ft. HYDRAULIC RADIUS = 0 .393 ft. SLOPE = 1.0% Q= 1 ~9 (A)( R)2/3( s) 1/2 Q= ~ ( 2.5 )( 0 .393) 213 ( 0 .01) 112 O=I 9 .99 cfs I 2·-0· 1·-0· "' "' Flume Section EXHIBIT E Typical Flume Section and Calculations CITY OF COLLEGE STATION Planning d-Drotlopment ~r uicts SITE LEGAL DESCRIPTION: Edelweiss Business Center Block 4 Lot 5 DATE OF ISSUE: 11/19/04 OWNER: David Price Homebuilders 422 Tarrow College Station, Texas 77840 TYPE OF DEVELOPMENT: SPECIAL CONDITIONS: DEVELOPMENT PERMIT PERMIT NO . 04-46 FOR AREAS OUTSIDE THE SPECIAL FLOOD HAZARD AREA RE : CHAPTER 13 OF THE COLLEGE STATION CITY CODE SITE ADDRESS: 215 Rock Prairie Road DRAINAGE BASIN: Lick Creek VALID FOR 12 MONTHS CONTRACTOR: Full Development Permit All construction must be in compliance with the approved construction plans All trees required to be protected as part of the landscape plan must be completely barricaded in accordance with Section 7.5 .E ., Landscape/Streetscape Plan Requirements of the C ity's Unified Development Ordinance, prior to any operat ions of this permit. The cleaning of equipment or materials within the drip line of any tree or group of trees that are protected and requ ired to remain is strictly prohibited . The disposal of any waste material such as , but not limited to , paint, oil , solvents , asphalt, concrete , mortar , or other harmful liquids or materials within the drip line of any tree required to remain is also prohibited . TCEQ PHASE II RULES IN EFFECT . The Contractor shall take all necessary precautions to prevent silt and debris from leaving the immediate construction site in accordance with the approved erosion control plan as well as the City of College Station Drainage Policy and Design Criteria. If it is determined the prescribed eros ion control measures are ineffective to retain all sediment onsite , it is the contractors responsibility to implement measures that will meet City , State and Federal requirements . The Owner and/or Contractor shall assure that all disturbed areas are sodden and establ ishment of vegetation occurs prior to removal of any silt fencing or hay bales used for temporary erosion control. The Owner and/or Contractor shall also insure that any disturbed vegetation be returned to its original condition , placement and state . The Owner and/or Contractor shall be responsible for any damage to adjacent properties , city streets or infrastructure due to heavy machinery and/or equ ipment as well as erosion, siltation or sedimentation resulting from the permitted work . In accordance with Chapter 13 of the Code of Ordinances of the City of College Station , measures shall be taken to insure that debris from construction, erosion, and sedimentation shall not be deposited in city streets , or existing drainage facilit ies . I hereby grant this permit for development of an area outs ide the special flood hazard area. All development shall be in accordance with the plans and specifications submitted to and approved by the City Engineer in the development permit application for the above named project and all of the codes and ordinances of the City of College Station that apply. Date Owner/Agent/Contractor Date FOR OFFICE Ud ONLY C..- P&Z CASE NO.: 0 -1 q D DATE SUBMITTED: 'ij-f '()..-'{)~1 SITE PLAN APPLICATION MINIMUM SUBMITTAL REQUIREMENTS /Site plan application completed in full. __.'.:'.::.. $200 .00 Application Fee . ___::::: $200 .00 Development Permit Application Fee. Ji_B:::-$600 .00 Public Infrastructure Inspection Fee if applicable . (This fee is payable if construction of a public waterline , sewerline , sidewalk, street or drainage facilities is involved .) J/ Eleven (11) folded copies of site plan ----;;;'One (1) folded copy of the landscape plan . &fL_ Two (2) copies of public infrastructure plans associated with this site plan (if applicable). II.ff: One (1) copy of building elevation required for buildings with a footprint of 20,000 sq. ft. or greater __ A list of building materials for all facades that are visib le from the public right-of-way. __ A copy of the attached site plan checklist with all items checked off or a brief explanation as to why they are not checked off. A.A: _ _parkland Dedication requirement approved by the Parks & Recreation Board, please provide proof of approval (if applicable). Date of Preapplication Conference: iJ'g.J e_ ~~~~~~~~~~~~~~~~~~~~~~~- NAME OF PROJECT _})_O._v_c~ J=-·..:___(J,_v-_~..,.::,U--::......__-'=tk~~~Lo~v:.i..:;J~e.:...:.... .... ....L.2'---....... -=L~J.J=-c_=-.L.C ------- ADDRESS _____ (J.__,_l~5"::......__~__,_,~Q~t,~~=-=-+1o..__.__:.....=l~f~t e...;>a.:::. ____________ ~ LEGALDESCRIPT IO N~-L~~-~~~-~~~'o~c=t=~-1~~-~-~~-~-~~ APPLICANT/PROJECT MANAGER 'S INFORMATION (Primary Contact for the Project ): Name Ref/\.~: e... Li..• le_ Street~ss 2lZ--Pl.Ve Uc.ll~ i)r-.· Je_ City ~C_,~5~, _____ _ State I )<· Zip Code 77! '/ .> E-Ma il Ad dress Cf;::· 4Jb,}e.. (id C4J)C-;A..fev-rJ-. (...-0,.._ Phone Num ber q71-foCj O-Z 5"1 C:. Fax Number 97'7 -~L/ &, -<{77 1 PROPERTY OWNER 'S INFORMATION : Name D~viJ. fY-1 )UL f~hv :frle vs Street Address 4 l 2--ltJt.¥ rD c...) ~ t · ~ State / X . Zip Code 77<f1{ D Phone Number CJ) 1-2 /la -o oo I ARCHITECT OR ENGINEER 'S INFORMATION : City C. ~, E-Mail Address d.Jhho~<;. (} ±c0--, t11 vf I Fax Number 171-t' L/ 0 -t/ 72 "j Name m -fVl f:J.?S 1' <] "'-' Street Address / g f 7 -14 {).ro ~vs ---State I K , 8/uJ. City _......_C~,.___~..cJ.·----- Zip Code 17 gtj )',-- Phone Number ---'Cj_.1 ........ 5_.__--=fo.......:.9_.L/'---7-.!....:::...o~)'--!.65_ 6/13/03 E-Ma il Address ~~~~~~~~~~~~ Fax Number ~~~~~~~~~~~~~- 1 of 6 OTHER CONTACTS _(Pl!fase speci'.Y type of contact , i.e . project manager, potential buyer, local contact , etc .) Name U6.u l ~ l2r ~UL street Address i 3 I 7-Llr o o k ko If &·d iA-. City f3 L'-1 q //\._., ~ State l X • Zip Code 77J"'-f 0 E-Mail Address ------------- Phone Number C3] CJ -711 -0 J 7 L Fax Number ------------- CURRENTZONING ____ ~_..1_ _____________________ ~ PRESENTUSEOFPROPERTY_~l~fa~t~a~~~-~'~:::_:t:--:__ _____________ ~ VARIANCE(S) REQUESTED AND REASON(S) _--1!.._M___l.,,o!-Jl'-..):::.!e.::.,_ _____________ _ #OF PARKING SPACES REQUIRED __ /_0 __ #OF PARKING SPACES PROVIDED_....!../....:../_ MULTI-FAMILY RESIDENTIAL Total Acreage ____ _ Floodplain Acreage ___ _ Housing Units ____ _ ___ # of 1 Bedroom Units ___ # of 2 Bedroom Units ___ # of 3 Bedroom Units ___ # of 4 Bedroom Units FOR 2 BEDROOM UNITS ONLY ___ #Bedrooms = 132 sq . ft . ___ #Bedrooms < 132 sq. ft . PARKLAND DEDICATION #of Multi-Family Dwelling Units ---x $452 = $ -------- _ __ #of acres in floodplain ___ # of acres in detention ___ # of acres in greenways ___ date dedication approved by Parks Board COMMERCIAL Total Acreage-------- Building Square Feet Z Z-~ 7 . '? Floodplain Acreage f\l o rJ L NOTE: Parkland Dedication fee is due prior to the issuance of a Building Permit. The applicant has prepared this application and certifies that the facts stated herein and exhibits attached hereto ar: true and corre t. or Applicant Date 6/13103 2 of 6