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HomeMy WebLinkAbout79 Development Permit 430 Grand Oaks SubdivisionFILE NOTE January 21 , 1996 GRAND OAKS SUBDIVISION l::P f1U2. Discussed with John Logan the testing on the storm sewer from Rose Circle to Lincoln . The Contractor tested the backfill compaction with ASTM d1557 (modified), instead of using ASTM 0698 (standard). Rather than go back and retest everything (which some we can 't go back and redo because it's been covered up), we agreed to accept all tests that passed a 90% compaction rate using ASTM 01557 . Any tests that did not pass this limit they would go back and rework. This storm sewer under consideration is located along rear lots and not under any pavement area. F !LE .' Gt:=Af..J.~ OA'C~ ~eJ ~,..,,.,,- CITY OF COi .I .EGE STATION October 3, 1996 David Scarmardo P .O. Box 4508 Bryan, Texas 77805 Post Office Box 9960 1101 Texas Avenue College Station, T exas 77842-9960 (409 ) 764-3500 RE : GRAND OAKS SUBDIVISION STORM SEWER OVERSIZE PARTICIPATION Dear David : The attached item was approved by Council at their August 8th meeting . They approved the expenditure of $18,612 .00 for the underground storm sewer along the rear property lines in the Grand Oaks Subdivision . Per the City Subdivision Regulations, after the drainage facility has been completed and accepted by the City Engineer, payment may be requested . I would suggest that when your contractor submits his letter of completion on the drainage system, you include your letter requesting payment. i}cerely, _ 1iiivilk; (1)~'-\ Veronica ~.If1J~orG~.E ., Assistant City Engineer CC : Kent Laza, P .E., City Engineer Steve Homeyer, Project Manager Mike McClure, McClure Engineering En closures : ( 1) ENGINEER'S CONSTRUCTI OR GRAND OAKS SU AUGUST 20, ITEM DESCRIPTION NO. COST STREET CONSTRUCTION 1 Erosion & Sedimentation Control LS . 1 $2.000.00 $2.000.00 2 Clearing & Grubbing (R.0.W. & Easements) Ac. 2.08 1.500.00 3.120.00 3 Excavation (Roadway) C.Y. 2,380 3.80 9,044.00 4 Excavation (Detention Area) C.Y. 672 3.80 2.553 .60 5 Cellulose Fiber Mulch Seeding S.Y. 1,000 0.50 500.00 6 6" Lime Stab. Subgrade (53 Lime) S.Y. 3.846 2.35 9.038.10 7 Extra Lime Ton 26 85.00 2.210.00 8 6" Flexible Base Crushed Stone S.Y. 2,876 6.00 17 ,256.00 9 1 W ' Hot Mix Asphaltic Concrete (Type DJ S.Y. 2.876 3.25 9.347 .00 10 Reinforced Concrete Curb & Gutter (Type A) L.F . 1.539 7.25 11 ,157.75 11 Reinf. Concrete Sidewalk S.F . 2. 106 1.85 3.896 .10 12 Reinf. Concrete Aprons (6" thick) S.F. 2,541 3.00 7.623 .00 13 2" PVC Conduit (Schedule 40) L.F . 35 5.00 175 .00 14 Remove Concrete Curb & Gutter L.F. 103 3.00 309.00 STREET CONSTRUCTION SUBTOTAL $78.229 .55 DRAINAGE CONSTRUCTION 15 21" RCP (C76. Cl. Ill) L.F . 736 31.00 $22 ,816.00 16 27' RCP (C76. Cl. Ill) L.F . 65 36.00 2,340.00 17 5' Standard Recessed Inlet Each 1.500.00 1.500 .00 18 1 O' Standard Recessed Inlet Each 2 1.750.00 3.500.00 19 15' Standard Recessed Inlet Each 1 2.250.00 2.250.00 20 Re inf. Concrete Junction Box Each 3 1,350.00 4.050 .00 21 Reinf. Cone. Yard Inlet Each 1 2,500.00 2,500.00 22 Sloped Cone. Headwall (4:1. 21" RCP) Each 2 700 1.400.00 23 Sloped Cone. Headwall (4:1 , 24" RCP) Each 1 900 900 .00 24 Reinf. Concrete Flume S.F. 196 3.25 637.00 25 Remove & Re-Lay 18" RCP L.F. 96 35.00 3.360 .00 .DRAINAGE CONSTRUCTION SUBTOTAL $45.253.00 SEWER LINE CONSTRUCTION 26 8" D.I. Pipe (Cl. 52, C151)(< 6' Depth) L.F . 464 30.00 $13.920.00 27 6" PVC (SDR -26, D3034) (< 6' Depth) L.F . 67 12.00 804.00 28 6" PVC (SDR-26, D3034)(6' to 8' Depth) L.F. 210 13 .00 2.730.00 29 6" PVC (SDR-26 , D3034) (8' to 1 O' Depth) L.F . 382 15 .00 5.730 .00 30 Machine Bore for 8" D.l.P. L.F . 48 45.00 2,160.00 31 Connect to Existing Manhole Each 450.00 450.00 Page 1 ENGINEER'S CONSTRUCTION COST ESTIMATE GRAND OAKS SUBDIVISION AUGUST 20, 1996 ITEM DESCRIPTION UNIT QUANTITY UNIT AMOUNT NO. COST 32 Std. 4' Manhole (< 6' Depth) Each 4 1. 100.00 4.400.00 33 Std. 4' Manhole (7 to 7.5' Depth) Each 2 1,200.00 2.400.00 34 Trench Safety (Sewer System) L.F. 730 1.00 730.00 35 4" Service Line (Type 1)(28' Avg. Length) Each 4 550.00 2.200.00 36 4" Service Line (Type 11)(38' Avg. Length) Each 4 585.00 2.340.00 SEWER LINE CONSTRUCTION SUBTOTAL $37,864.00 WATER LINE CONSTRUCTION 37 6" PVC (C900, Cl. 200) L.F. 728 12.50 $9. 100.00 38 Machine Bore for 6" PVC Pipe L.F. 50 35.00 1.750.00 39 16" X 6" M.J. Tapping Sleeve & Valve Each 1 5,000.00 5,000.00 40 6" X 45° M.J. Bend Each 4 150.00 600.00 41 Fire Hydrant Assembly (Type I) (4' Barrel) Each 1.600.00 1.600.00 42 Z' Blow-off Assembly with 6" Cap ' Each 1 450.00 450:00 43 1 ~"Type K Copper Serv. (60' Avg. Length) Each 9 1,000.00 9,000.00 44 Trench Safety (Water Line) L.F. 653 0.50 326.50 WATER LINE CONSTRUCTION SUBTOTAL $27,826.50 TOTAL ESTIMATED COST OF CONSTRUCTION $189, 173 .05 Page2 ACCOUNTNO .~---------------- Cl z F ce LE9'~ STATION $-----,{--+-~~~ Pai d by -Figure XII Application Form Development Permit Inside/Outside Established Flood Hazard Areas City of College Station, Texas (re: Ordinance No. 1728) Site Legal Description: __ GRAND_--.::.:-'~--_o_!AKS __ s_UB_D_IV_I_s_I_o_N ___________________ _ Site Address: __ L_i_n_co_l_n_A_v_e_n_u_e __ ~----------------~-:-::------­ P .O. Box :11508 DAVID SCARMAROO Owner: -------------~-------Address: Bryan, TX 77805 Telephone No.: _7:....:7:...=9~-..:...72::::.:0~9:,__ ____ _ 1722 Broadmoor, Suite 210 ~ Michael R. McClure, P.E.' R.P.L.S. Address: Bryan, TX 77602 Engineer: McCLURE ENGINEERING, INC. Telephone No.: __ 7:..._7~6::....-~6:...:.7~0~0 ____ _ 3407 Tabor Road Contractor: _~_co_N _________________ Address: Bryan, TX 77808 Telephone No.: _7:....:7~8~-..:...13~5~5:,__ ____ _ Date Application Filed:---------------Approved:------------ Application is hereby made for the following_spccific waterway alterations : subdivision development to property flowing to an un-narned tributary of Burton Creek : Attached as part of this application: 129 Application Fee (?9 Signe.d Certificate O Site and Construction Plans, with supporting documenu1tion : iwo (2) copies of each O Other: ~~~~~~--~~~~~-~-~~ ACKNOWLEDGEMENTS: I, David Scarrnardo as owner, hereby acknowledge or affirm that: The above Drainage Plan and supporting documents complies wiht the requirements of Ordinance No. 1728, a~ - Date /, 10 /iz r<i f Date /IJ-LB -96. Date Page 1of2 Figure XII Continued · CERTIFICATIONS: A I, certify that any nonresidential structure on or proposed to be on this site as part ofthis application meets flood-proofing requirements as set out in Section of Ordinance No. 1728 Architect/Engineer Date B. I, certify that the finished floor level of the lowest floor, including any _ basement, of any residential str:ucture as part of this application is or proposed to be at or above the base flood elevation as established in the latest Federal Insurance Administration flood hazard study and maps, as amended. Architect/Engineer Date Architect/Engineer Date· REVIEWED FOR APPROVAL: -------------~ · Floodplain Administrator Date APPROVAL: Special conditions or comments as part of approval:---------- Pae:e 2 of 2 'r'omoNlpopp.doc 12/91 DEVELOPMENT PERMIT PERMIT NO. 430 GRAND OAKS SUBDIVISION FOR AREAS OUTSIDE THE SPECIAL FLOOD HAZARD AREA RE: CHAPTER 13 OF THE COLLEGE STATION CITY CODE SITE LEGAL DESCRIPTION: Grand Oaks Subdivision SITE ADDRESS: Not Addressed OWNER: David Scarmardo P .O . Box 4508 Bryan, Texas 77805 DRAINAGE BASIN: Burton Creek TYPE OF DEVELOPMENT: This permit is valid for all construction act1vttles specified on the approved plans. Contractor shall prevent silt and debris from leaving the site in accordance with the City of College Station Drainage Policy and Design Criteria. Owner and/or contractor shall be responsible for any damage to existing city streets or infrastructure due to heavy machinery and/or equipment. 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 facilities. I hereby grant this permit for development of an area outside the special flood hazard area. All development shall be in accordance with the plans and specifications submitted to and approved by t City Engineer in the development permit application for the above named pr · e and of the codes and ordinances of the City of College Station that apply . Date / / lb (2 )/?,k Date Contractor Date McCLURE ENGINEERING, INC. -----+-1--+-*-+--- January 30, 1997 Mr. Steve Homeyer Graduate Engineer CITY OF COLLEGE STATION P .O . Box 9960 College Station, Texas 77842 RE : GRAND OAKS SUBDIVISION FIELD CHANGE NO. 2 f/ l£ : G ,eA f-.-lD ,-.--cA 1CS 1£V f~1\ PROPOSED REVISION TO CURB & GUTTER SECTION Dear Steve : At the direction of the developer, Mr. David Scarmardo, please receive this letter as our formal request to revise the curb and gutter section shown on detail sheet S 1 of the approved construction plans for Grand Oaks Subdivision . We request your approval to use City of College Station typical detail "PCS" as shown on the attached sheet , in lieu of the above referenced section. Your early review and approval of this field chan~e is appreciated . Should you have any questions or need additional information, please advise . :MRM/mlm attachment 1722 Broadmoor, Suite 21 O • Bryan, Texas 77802 • (409) 776-6700 • FAX (409) 776-6699 ~ 10:39 '5'409 764 3496 DEVELOPMENT SVCS ~~~ MCCLURE ~ 002 /002 LAYBACK CURB DETAILS 7 1/16" y" 1 '"'" " r2 2 r r~ ! R\ I -" I I . 1~" • \j ' • . I ~r· r. ....... 1 1-•· n . 8 'k +. ~-r:: 6 7 lf2 1 -c \_ I"~ 1e" _/ 3" 1 · 4 ~onoitudinal ~ v c~ I~ ..__ _____ 2411 ---.:..--~. CITY STANDARD .-t 4 1/2" ~ ~ 3" 12. 12" Longitudino\ ~-f4 Bors Ls "5' 1--1 --24~--l 1/2 " PCS WC7 PC6 ~·~ (CITY OF COLLE9E STATION ~ Engmeenng D1v1s1on PREPARED FOR: DRAINAGE REPORT FOR GRAND OAKS SUBDIVISION 5. 704 ACRES OF LOTS 1 & 2, WOODLAND ESTATES RICHARD CARTER LEAGUE, A-8 COLLEGE STATION, TEXAS JUNE 12, 1996 REVISED 8/20/96 PREPARED BV: David Scannanlo & Sam campise P.O. Box 5408 McCLURE ENGINEERING, INC. 1722 Broadmoor, Suite 210 Bryan, Texas 77802 Bryan, Texas 77805 DRAINAGE REPORT FOR GRAND OAKS SUBDIVISION 5. 704 ACRES OF LOTS 1 & 2, WOODLAND ESTATES RICHARD CARTER LEAGUE, A-8 COLLEGE STATION, TEXAS AP JUNE 12, 1996 . · FO R · \ PREPARED FOR: Da\lld Scannardo & Sam campise P.O. Box 5408 Bryan, Texas 77805 REVISED 8/20/96 PREPARED BY: McCLURE ENGINEERING, INC. 1722 Broadmoor, Suite 21 O Bryan, Texas 77802 I \ CERTIFICATION I, Michael R. McClure , Registered Professional Engineer No. 32740, State of Texas, certify that this report for the drainage design of GRAND OAKS SUBDIVISION, was prepared by me in accordance with the provisions of the City of College Station Drainage Policy and Design Standards for the owners thereof. INTRODUCTION: STORM DRAINAGE REPORT GRAND OAKS SUBDIVISION This storm drainage report is intended to cover the necessary drainage improvements for the Grand Oaks Subdivision including the detention. The parameters used for design and the existing conditiorls of the on site area are incorporated to show how the final drainage design will accomplish the desired drainage objectives per the City of College Station Drainage Policy and Design Standards (DPDS.) GENERAL LOCATION AND DESCRIPTION: Grand Oaks Subdivision is located in the northeastern portion of College Station. The site has frontage along the south side of Lincoln Drive and is approximately 500' east of Munson Avenue. The site is adjacent to Sweet Briar Subdivision (to the south), Carter's Grove, Second Installment (to the east), and is a replat of a portion of Lots 1 and 2 of Woodland Estates. Two Lincoln Place subdivision is across Lincoln Avenue and slightly to the west. Sheet 7 of the project Construction Plans is included in this drainage report to show a general location, a Drainage Area Map , and Drainage Computations. 1be site is heavily wooded and gently rolling with an average of3% slopes. The site is currently undeveloped. PRIMARY DRAINAGE BASIN DESCRIPTION: The entire site (5.704 Acres) drains to the north, into the Lincoln Avenue right-of-way and eventually to Burton Creek. Most of the area is controlled by an existing inlet located in front of the site. This inlet (called inlet number 8) will continue to control roughly the same area. Water from the Sweet Briar Subdivision in Drainage Area Nos. 1 & 2 sheet flows across the southerly property line of the proposed GRAND OAKS SUBDIVISION. Concentrated flows from Drainage Area No. 9 are released without an easement or an adequate drainage path to the storm drain system in Lincoln Avenue. At the request of the city, this water will be intercepted with a storm drain system that is proposed near the east comer of this development. The drainage will then be conveyed via the storm drain to the beforementioned inlet No. 8 and finally into a tributary of Burton Creek. A small area (labeled Drainage Area No. 10) does not flow to inlet No. 8, but will be released to the curb line of Lincoln A venue. This area currently drains to Lincoln A venue and its flow characteristics are not significantly changed from its predeveloped condition No portion of the site is within the 100 year flood plain per the Federal Emergency Management Agency's Flood Insurance Rate Map No. 48041C0142 C, dated July 2, 1992 (see Exhibit "A"). DRAINAGE FACILITY DESIGN: The proposed drainage patterns will not significantly alter the existing conditions. Storm water traverses the site in sheet flow. This condition will be modified in that some of the sheet flow will be concentrated in curb lines and captured in curb inlets and conveyed to the detention facility 2 in concrete pipes. Sheet 7 of the Construction Plans contains the rational calculations for the various drainage areas corresponding to the Drainage Area Map. Sheet 7 also shows the computations to verify the size of the proposed inlets and pipes. DRAINAGE DESIGN CRITERIA: All drainage design is in accordance with the City DPDS. The design storm is the 10-year event . Flow calculations for all drainage areas are based on the Rational Method (see Sheet 7). Inlet sizing is based on the calculated capacity of a standard recessed inlet for the design street slopes. Pipe sizing is in accordance with Manning's Equation with an "n" of .014 per the DPDS. The storm drains in the streets are designed to convey the 10-year flow with the hydraulic grade line at least .5' below the gutter line ' of the street. Flow calculations for the required detention facilities use a triangular hydrograph (base = 3 * Tc) and peak flows computed using the rational method. The routings are presented in Tabular form (see Exlnbit ''C''). The detention basin outlet control structure is designed using a single 21" diameter orifice located at the bottom of the detention facility. Orifice flow is based on the equation Q = C * A * (2 * g * H )"' 1/2 where C= .70 A= area of opening H = head in feet, measured from center of orifice g = 32 .2 ft/ sec"2 Exhibit ''C" shows a graphical representation of the effectiveness of the detention system . 3 Please note that the hydrograph labeled Pl represents the flow entering the proposed detention pond (Drainage Area Nos. 1-5 & 9). The hydrograph labeled P2 identifies the flow characteristics from the Drainage Areas that do not enter the pond (Drainage Area Nos. 6-8 & 10). The hydrograph labeled IE is the sum of the existing Drainage Areas 1 through 10 . Their peak runoff flows are shown on Sheet 7 of the Construction Plans and as included in this report. Exhibit ''D" indicates the calculation of the storage routing in tabular form . The hydrograph labeled Pond (Q n+l) and "Total Proposed" are computed in these exhibits . The flows at the study point (the existing Inlet No . 8) are shown in Table 1. TABLE 1 Storm Event 100-year 50-year 25-year 10-year 5-year Existing ( cfs) 73 65 57 50 45 Proposed ( cfs) 61 46 41 38 36 Peak W .S. Elev. 301.20 301.10 300.60 300.00 299.50 in Pond Drainage Area No . 4 has a low point inlet which will require an overland relief for flows in excess of the 10-year storm. This excess is less than 2 cfs in this case. A swale (as shown in Exhibit "B'') will be provided to handle this flow. For the storm events studied (5, 10, 25, 50 & 100-year events), the combined peak discharge for those drainage areas contributing to the detention pond, as well as circumventing the pond, is less than the peak discharge for the undeveloped drainage areas . The results are summarized in Table 1. 4 Note that the maximum water surface elevation in the pond is slightly above the overflow spillway elevation 301. Adequate freeboard is provided for the 5, 10 and 25-year storm events . In the event larger storms occur, the overflow will enter the Lincoln Avenue right-of-way and discharge into the tributary of Burton Creek. CONCLUSION: The drainage design for this subdivision meets the requirements as stated in the City of College Station Drainage Policy and Design Standards. 5 ZONE X JOINS PANEL 0144 ,,,____ PROPOSED GRAND OAKS ZONE X City of College Station 480083 EXHIBIT ''A'' EXCERPI' FRCN FEMA MAP r-D. 48041C0142 C (7/2/92) • EXHIBIT B GRAND OAKS OVERLAND RELIEF FOR D.A. #4 7.75' Exisiting Ground I Min. Slope 1 % Min . Depth . 75' Flow Depth = 0 .57' Proposed Storm Drain 40.00 35.00 30.00 25 .00 ~ u i' 20.00 0 ii: 15 .00 10 .00 5 .00 Grand Oaks 5 Year Hydrographs 0.00 -F-------+------t-------+-------+-------t-=:~-~ 00 5.0 10.0 15.0 20 .0 25 .0 30 .0 - - - - - -P1 --POND (Qn+1) --P2 --Total Prop --E1 f> \ -f" LOW eN1E~ I NG tic ND P2. -I-LOW IHAT OoES NoT eNTee roN"D EI -~M OF AeEA'S I -lo (EXl~T 1NG) 3 .0 -5 .00 ..___ ____________________________________ ___J Time(min) Exhibit C Grand Oaks 1 O Year Hydrographs 40 .00 - - - - - -P1 POND (Qn+1) ---P2 ---Total Prop 30 .00 ---E1 ~ ~ ~ u:: 20 .00 00 5 .0 10 .0 15 .0 20 .0 25.0 30 .0 3 .0 Time(min) Exhibit C Grand Oaks 25 Year Hydrographs 40 .00 - - - ---P1 POND (Qn+1 ) ---P2 ---Total Prop 30 .00 E1 ~ .!:!.. ~ ii: 20 .00 00 5.0 10 .0 15 .0 20 .0 25 .0 30 .0 3 .0 -10.00 _,__ ___________________________________________ __, Time (min) Exhibit C Grand Oaks 50 Year Hydrographs 50 .00 - - - - --P1 POND (Qn+1) ---P2 40.00 Total Prop ---E1 ~ .£. 30 .00 ~ u::: 20 .00 00 5 .0 10 .0 15.0 20 .0 25.0 30 .0 3 .0 Time(min) Exhibit C Grand Oaks 100 Year Hydrographs 70 .00 60 .00 --- - - -P1 50.00 ---POND (Qn+1) ---P2 ---Total Prop ~ 40 .00 ---E1 ~ ~ u: 30.00 20 .00 10.00 0 .00 00 5 .0 10.0 15.0 20 .0 25 .0 30.0 3 .0 -10.00 Time(min) Exhibit C D.A.# Pond Routing =It .r. c. l! Cl ..... 0 + '-c "CJ + >-a.. :::c ..... c Qp 40.9 Tc 10.5 inc 1.0 Time cfs cfs 0.0 0.0 3.90 1.0 3.9 11.69 2.0 7.8 19.48 3.0 11.7 27.27 4.0 15.6 35.06 5.0 19.5 42.85 6.0 23.4 50.65 7.0 27.3 58.44 .8.0 31.2 66.23 9.0 35.1 74.02 10.0 39.0 78.89 11.0 39.9 77.92 12.0 38.0 74.02 13.0 36.0 70.13 14.0 34.1 66.23 15.0 32.1 62.33 16.0 30.2 58.44 17.0 28.2 54.54 18.0 26.3 50.65 GRAND OAKS Detention Pond Routing EVENT= 5 D.A. # c ~l 3~ a + c ~ c ~~ 0 l>.l~ a .. I ..... -+ ..... "CJ cu ~~ "CJ c ~'fl + c > -c o~ "' "' a.. N N a a.. w N 14.0 8.7 cfs cf s cf s ft cfs 0.00 0.00 0.00 295.0 0.0 -3.90 3.90 3.90 295.6 1.6 -5.01 7.79 6.40 296.0 3.2 -1.09 14.47 7.78 296.2 4.8 5.80 26.18 10.19 296.5 6.4 14.44 40.86 13.21 296.8 8.1 26.45 57.29 15.42 297.1 9.7 43.44 77.10 16.83 297.4 11.3 64.71 101.88 18.59 297.7 12.9 90.18 130.94 20.38 298.1 13.8 120.82 ,164.20 21.69 298.4 13.0 153.52 199.71-23.09 298.7 12.2 182.90 231.44 24.27 299.0 11.4 207.27 256.92 24.82 299.2 10.5 226.86 277.40 25.27 299.3 9.7 241.86 293.08 25.61 299.4 8.9 252.48 304.19 25.86 299.5 8.1 258.91 310.91 26.00 299.5 7.3 261.33 313.45 26.06 299.5 6.5 19.0 24.3 46.75 259.92 311.98 26.03 299.5 5.7 20.0 22.4 42.85 254.85 306.67 25.91 299.5 4.9 21.0 20.5 38.96 246.27 297.70 25.72 299.4 4.1 22.0 18.5 35.06 234.35 285.23 25.44 299.4 3.3 23.0 16.6 31.17 219.21 269.41 25.10 299.3 2.5 24.0 14.6 27.27 201.02 250.38 24.68 299.1 1.7 25.0 12.7 23.38 179.89 228.29 24.20 299.0 0.9 26.0 10.7 19.48 156.80 203.27 23.23 298.8 0.1 27.0 8.8 15.58 131.94 176.28 22.17 298.5 0.0 28.0 6.8 11.69 105.45 147.52 21.03 298.2 0.0 29.0 4.9 7.79 77.80 117.14 19.67 297.9 0.0 30.0 2.9 3.90 50.74 85.59 17.43 297.5 0.0 31.0 1.0 0.97 24.17 54.63 15.23 297.1 0.0 32.0 0.0 0.00 5.19 25.14 9.98 296.4 0.0 33.0 0.0 0.00 -5.19 5.19 5.19 295.9 0.0 PEAK FLOWS 39.93 26.06 299.5 13.77 0.00 indicates inital condition D.A.# c w "' _J 0 ct a.. I-0 0 0:: w I-a.. ..... 45.8 10.5 cfs cfs 0.00 0.0 5.51 4.4 9.63 8.7 12.61 13.1 16.64 17.4 21.28 21.8 25.09 26.2 28.11 30.5 31.48 34.9 34.15 39.3 34.66 43.6 35.26 44.7 35.62 42.5 35.37 40.4 35.02 38.2 34.55 36.0 33.99 33.8 33.33 31.6 32.58 29.4 31.74 27.3 30.82 25.1 29.82 22.9 28.74 20.7 27.59 18.5 26.37 16.4 25.08 14.2 23.31 12.0 22.17 9.8 21.03 7.6 19.67 5.5 17.43 3.3 15.23 1.1 9.98 0.0 5.19 0.0 35.62 44.71 Exhibit D I GRAND OAKS Detention Pond Routing D.A.# Pond Routing EVENT= 10 =II: c .r::. a Q. + e c :0 c Cl .... a 0 -;: 0 + ,.!. .... '-c + .... "C cu "C + "C c + c > -c 0 .!! >-a. "' "' :::c .... c N N a a. w Qp 45.9 Tc 10.5 inc 1.0 Time cfs cfs cfs cfs cfs ft 0.0 0.0 4.38 0.00 0.00 0.00 295.0 1.0 4.4 13.13 -4.38 4.38 4.38 295.7 2.0 8.8 21.88 -4.45 8.75 6.60 296.1 3.0 13.1 30.63 0.65 17.43 8.39 296.3 4.0 17.5 39.38 8.80 31.28 11.24 296.6 5.0 21.9 48.13 18.74 48.18 14.72 297.0 6.0 26.3 56.88 34.66 66.87 16.10 297.2 7.0 30.6 65.63 55.84 91.54 17.85 297.6 8.0 35.0 74.38 81.52 121.47 19.98 298.0 9.0 39.4 83.13 113.17 155.90 21.36 298.3 10.0 43.8 88.60 150.38 196.30 22.QS 298.7 11.0 44.8 87.51 190.12 238.98 24.43 299.1 12.0 42.7 83.13 227.07 277.62 25.28 299.3 13.0 40.5 78.76 258.22 310.20 25.99 299.5 14.0 38.3 74.38 283.83 336.98 26.57 299.7 15.0 36.1 70.01 304.14 358.22 27.04 299.8 16.0 33.9 65.63 319.38 374.15 27.38 299.9 17.0 31.7 61.25 329.76 385.01 27.62 300.0 18.0 29.5 56.88 335.55 391.02 27.73 300.0 19.0 27.3 52.50 336.92 392.43 27.76 300.0 20.0 25.2 48.13 334.00 389.42 27.71 300.0 21.0 23.0 43.75 327.01 382.13 27.56 300.0 22.0 20.8 39.38 316.14 370.76 27.31 299.9 23.0 18.6 35.00 301.56 355.52 26.98 299.8 24.0 16.4 30.63 283.44 336.56 26.56 299.7 25.0 14.2 26.25 261.92 314.06 26.07 299.5 26.0 12.0 21.88 237.16 288.17 25.51 299.4 27.0 9.8 17.50 209.29 259.03 24.87 299.2 28.0 7.7 13.13 178.47 226.79 24.16 299.0 29.0 5.5 8.75 146.05 191.59 22.77 298.7 30.0 3.3 4.38 112.15 154.80 21.32 298.3 31.0 1.1 1.09 77.28 116.53 19.63 297.9 32.0 0.0 0.00 44.54 78.37 16.92 297.4 33.0 0.0 0.00 16.60 44.54 13.97 296.9 PEAK FLOWS 44.85 27.76 300.0 0.00 indicates inital condition D.A. # D.A.# a w "' ..J 0 ~~ 0 0:: a. w N I-a. .... 15.7 51.4 8.7 10.5 cfs cfs cf s 0.0 0.00 0.0 1.8 6.18 4.9 3.6 10.21 9.8 5.4 13.81 14.7 7.2 18.47 19.6 9.0 23.75 24.5 10.8 26.94 29.4 12.6 30.49 34.3 14.4 34.42 39.2 15.4 36.80 44.1 14.5 37.49 49.0 13.6 38.06 50.2 12.7 38.00 47.8 11.8 37.81 45.3 10.9 37.49 42.9 10.0 37.05 40.4 9.1 36.50 38.0 8.2 35.83 35.5 7.3 35.04 33.1 6.4 34.16 30.6 5.5 33.21 28.2 4.6 32.16 25.7 3.7 31.01 23.3 2.8 29.78 20.8 1.9 28.46 18.4 1.0 27.07 15.9 0.1 25.60 13.5 0.0 24.87 11.0 0.0 24.16 8.6 0.0 22.77 6.1 0.0 21.32 3.7 0.0 19.63 1.2 0.0 16.92 0.0 0.0 13.97 0.0 15.43 38.06 50.22 Exhibit D D.A. # Pond Routing :it .r:. c.. ~ Cl .... 0 + .... .E ,, + >-0.. :c .... c Qp 52.5 Tc 10.5 inc 1.0 Time cfs cfs 0.0 0.0 5.00 1.0 5.0 14.99 2.0 10.0 24.99 3.0 15.0 34.99 4.0 20.0 44.98 5.0 25.0 54.98 6.0 30.0 64.98 7.0 35.0 74.97 8.0 40.0 84.97 9.0 45.0 94.97 10.0 50.0 101.22 11.0 51.2 99.97 12.0 48~7 94.97 13.0 46.2 89.97 14.0 43.7 84.97 15.0 41.2 79.97 16.0 38.7 74.97 17.0 36.2 69.98 18.0 33.7 64.98 19.0 31.2 59.98 20.0 28.7 54.98 21.0 26.2 49.98 22.0 23.7 44.98 23.0 21.2 39.99 24.0 18.7 34.99 25.0 16.2 29.99 26.0 13.7 24.99 27.0 11.2 19.99 28.0 8.7 14.99 29.0 6:2 10.00 30.0 3.7 5.00 31.0 1.2 1.25 32.0 0.0 0.00 33.0 0.0 0.00 PEAK FLOWS 51.23 0. 00 indicates in ital condition GRAND OAKS Detention Pond Routing EVENT= 25 c a + c c '6 0 a -:;: I .... ,, C'CI -+ .... ,, c + c > -c 0 .!! (/) (/) N N a 0.. w cf s cfs cfs ft 0.00 0.00 0.00 295.0 -5.00 5.00 5.00 295.8 -3.72 10.00 6.86 296.1 2.91 21.27 9.18 296.4 12.69 37.90 12.60 296.7 26.78 57.68 15.45 297.1 47.45 81.76 17.16 297.4 73.76 112.43 19.33 297.9 106.57 148.73 21.08 298.3 146.00 191.54 22.77 298.7 192.01 240.96 24.48 299.1 241.99 293.23 25.62 299.4 288.59 341.96 26.68 299.7 328.38 383.56 27.59 300.0 362.04 418.35 28.15 300.1 389.83 447.01 28.59 300.3 411.92 469.80 28.94 300.4 428.49 486.89 29.20 300.5 439.70 498.46 29.38 300.5 445.73 504.68 29.48 300.6 446.73 505.71 29.49 300.6 442.85 501.71 29.43 300.6 434.24 492.83 29.29 300.5 421.05 479.23 29.09 300.4 403.43 461.04 28.81 300.4 381.49 438.41 28.46 300.2 355.39 411.48 28.05 300.1 325.34 380.38 27.52 300.0 291.82 345.33 26.76 299.7 254.98 306.81 25.91 299.5 . 214.98 264.98 25.00 299.2 172.19 219.98 23.89 298.9 129.33 173.44 22.06 298.5 88.69 129.33 20.32 298.1 29.49 300.6 D.A.# D.A.# c w (/) ..J 0 < 0.. .... 0 0 0:: w 0.. N .... 0.. .... 17.9 58.8 8.7 10.5 cfs cf s cfs 0.0 0.00 0.0 2.1 7.06 5.6 4.1 10.98 11.2 6.2 15.37 16.8 8.2 20.85 22.4 10.3 25.76 28.0 12.4 29.53 33.6 14.4 33.76 39.2 16.5 37.57 44.8 17.6 40.39 50.4 16.6 41.06 56.0 15.6 41.17 57.4 14.5 41.21 54.6 13.5 41.08 51.8 12.5 40.62 49.0 11.4 40.02 46.2 10.4 39.34 43.4 9.4 38.57 40.6 8.3 37.72 37.8 7.3 36.79 35.0 6.3 35.77 32.2 5.3 34.68 29.4 4.2 33.52 26.6 3.2 32.28 23.8 2.2 30.97 21.0 1.1 29.59 18.2 0.1 28.15 15.4 0.0 27.52 12.6 0.0 26.76 9.8 0.0 25.91 7.0 0.0 25.00 4.2 0.0 23.89 1.4 0.0 22.06 0.0 0.0 20.32 0.0 17.61 41.21 57.37 Exhibit D GRAND OAKS Detention Pond Routing D.A.# Pond Routing EVENT= 50 'It c: J:. a c. + l! c: -c: Cl .... a "C 0 -.. 0 + I .... ... c: -+ .... "C CG "C + "C c: + c > -c 0 ..! >-D.. UJ UJ :::c .... c N N a D.. UJ Qp 59.3 Tc 10.5 inc 1.0 Time cfs Cfs cfs cfs cfs ft 0.0 0.0 5.65 0.00 0.00 0.00 295.0 1.0 5.7 16.95 -5.65 5.65 5.65 295.9 2.0 11.3 28.26 -2.95 11.30 7.13 296.1 3.0 17.0 39.56 5.29 25.31 10.01 296.5 4.0 22.6 50.86 16.78 44.85 14.03 296.9 5.0 28.3 62.17 35.33 67.64 16.16 297.3 6.0 33.9 73.47 60.95 97.50 18.27 297.7 7.0 39.6 84.77 93.39 134.42 20.52 298.1 8.0 45.2 96.08 133.67 178.16 22.24 298.5 9.0 50.9 107.38 181.29 229.75 24.23 299.0 10.0 56.5 114.44 237.63 288.66 25.52 299.4 11.0 57.9 113.03 298.27 352.07 26.90 299.8 12.0 55.1 107.38 355.21 411.30 28.05 300.1 13.0 52.3 101.73 404.92 462.59 28.83 300.4 14.0 49.5 96.08 447.64 506.65 29.51 300.6 15.0 46.6 90.42 483.57 543.72 30.07 300.8 16.0 43.8 84.77 512.92 573.99 30.54 300.9 17.0 41.0 79.12 533.05 597.69 32.32 301.0 18.0 38.1 73.47 540.00 612.17 36.09 301.1 19.0 35.3 67.82 540.62 613.47 36.42 301.1 20.0 32.5 62.17 538.20 608.43 35.12 301.0 21.0 29.7 56.52 534.34 600.37 33.02 301.0 22.0 26.8 50.86 529.26 590.85 30.80 301.0 23.0 24.0 45.21 518.86 580.12 30.63 300.9 24.0 21.2 39.56 503.30 564.07 30.39 300.9 25.0 18.4 33.91 482.74 542.86 30.06 300.8 26.0 15.5 28.26 457.34 516.65 29.66 300.6 27.0 12.7 22.61 427.23 485.59 29.18 300.5 28.0 9.9 16.95 392.56 449.83 28.64 300.3 29.0 7.1 11.30 353.48 409.52 28.02 300.1 30.0 4.2 5.65 310.42 364.78 27.18 299.9 31.0 1.4 1.41 263.84 316.07 26.12 299.6 32.0 0.0 0.00 215.24 265.25 25.01 299.2 33.0 0.0 0.00 167.83 215.24 23.71 298.9 PEAK FLOWS 57.93 36.42 301.1 0.00 indicates inital condition D.A.# D.A.# c UJ UJ ..J 0 ~~ 0 0::: D.. UJ N .... D.. .... 20.2 66.4 8.7 10.5 cfs cfs cf s 0.0 0.00 0.0 2.3 7.98 6.3 4.7 11.79 12.7 7.0 17.00 19.0 9.3 23.35 25.3 11.6 27.80 31.6 14.0 32.25 38.0 16.3 36.82 44.3 18.6 40.87 50.6 19.9 44.13 57.0 18.7 44.26 63.3 17.6 44.48 64.9 16.4 44.45 61.7 15.2 44.07 58.5 14.1 43.58 55.4 12.9 42.99 52.2 11.8 42.29 49.0 10.6 42.91 45.9 9.4 45.51 42.7 8.3 44.69 39.6 7.1 42.21 36.4 5.9 38.95 33.2 4.8 35.57 30.1 3.6 34.24 26.9 2.4 32.83 23.7 1.3 31.34 20.6 0.1 29.78 17.4 0.0 29.18 14.2 0.0 28.64 11.1 0.0 28.02 7.9 0.0 27.18 4.7 0.0 26.12 1.6 0.0 25.01 0.0 0.0 23.71 0.0 19.89 45.51 64.86 Exhibit D D.A.# Pond Routing :u: .r:. c. e Cl .... 0 + ... c "C + >. Q. :::c .... c Qp 66.7 Tc 10.5 inc 1.0 Time cf s cfs 0.0 0.0 6.35 1.0 6.4 19.06 2.0 12.7 31.76 3.0 19.1 44.47 4.0 25.4 57.17 5.0 31.8 69.88 6.0 38.1 82.58 7.0 44.5 95.29 8.0 50.8 107.99 9.0 57.2 120.70 10.0 63.5 128.64 11.0 65.1 127.05. 12.0 61.9 120.70 13.0 58.8 114.34 14.0 55.6 107.99 15.0 52.4 101.64 16.0 49.2 95.29 17.0 46.1 88.93 18.0 42.9 82.58 19.0 39.7 76.23 20.0 36.5 69.88 21.0 33.4 63.52 22.0 30.2 57.17 23.0 27.0 50.82 24.0 23.8 44.47 25.0 20.6 38.11. 26.0 17.5 31.76 27.0 14.3 25.41 28.0 11.1 19.06 29.0 7.9 12.70 30.0 4.8 6.35 31.0 1.6 1.59 32.0 0.0 0.00 33.0 0.0 0.00 PEAK FLOWS 65.11 0.00 indicates inital condition GRAND OAKS Detention Pond Routing EVENT= 100 c a + c ... c a "C 0 -+:: I .... ... + .... "C C'll "C c + c > -c 0 .!! (/) (/) N N a Q. w cfs cfs cfs ft 0.00 0.00 0.00 295.0 -5.86 6.35 6.11 296.0 -1.84 13.20 7.52 296.2 8.00 29.93 10.96 296.6 22.31 52.47 15.08 297.1 45.49 79.49 17.00 297.4 76.28 115.37 19.54 297.9 115.90 158.86 21.48 298.3 164.09 211.19 23.55 298.8 221.77 272.09 25.16 299.3 289.08 342.47 26.69 299.7 361.43 417.72 28.14 300.1 430.03 488.48 29.23 300.5 490.36 550.72 30.18 300.8 536.42 604.71 34.15 301.0 555.45 644.41 44.48 301.1 561.54 657.09 47.78 301.2 561.41 656.83 47.71 301.2 558.30 650.34 46.02 301.2 553.76 640.88 43.56 301.1 548.54 629.99 40.73 301.1 542.99 618.42 37.71 301.1 537.28 606.52 34.62 301.0 531.50 594.46 31.48 301.0 520.99 582.32 30.66 301.0 504.64 565.46 30.41 300.9 482.64 542.76 30.06 300.8 455.15 514.40 29.62 300.6 422.35 480.56 29.11 300.5 384.40 441.41 28.51 300.3 341.45 397.10 27.83 300.0 294.18 347.80 26.81 299.7 244.42 295.77 25.67 299.4 195.32 244.42 24.55 299.1 47.78 301.2 D.A.# D.A.# c w (/) -' 0 ct Q. .... 0 0 0:: Q. w N .... Q. .... 22.7 74.7 8.7 10.5 cf s cfs cfs 0.0 0.00 0.0 2.6 8.72 7.1 5.2 12.75 14.2 7.8 18.81 21.3 10.4 25.54 28.5 13.1 30.07 35.6 15.7 35.23 42.7 18.3 39.78 49.8 20.9 44.46 56.9 22.3 47.50 64.0 21.0 47.73 71.1 19.7 . 47.87 72.9 18.4 47.65 69.4 17.1 47.29 65.8 15.8 49.95 62.2 14.5 58.97 58.7 13.2 60.97 55.1 11.9 59.59 51.6 10.6 56.60 48.0 9.3 52.83 44.5 8.0 48.69 40.9 6.7 44.38 37.3 5.4 39.97 33.8 4.0 35.53 30.2 2.7 33.41 26.7 1.4 31.84 23.1 0.1 30.19 19.6 0.0 29.62 16.0 0.0 29.11 12.4 0.0 28.51 8.9 0.0 27.83 5.3 0.0 26.81 1.8 0.0 25.67 0.0 0.0 24.55 0.0 22.34 60.97 72.91 Exhibit D DRAINAGE REPORT FOR GRAND OAKS SUBDIVISION OWNER: 5. 704 ACRES OF LOTS 1 & 2, WOODLAND ESTATES RICHARD CARTER LEAGUE, A-8 COLLEGE STATION, TEXAS JUNE 12, 1996 REVISED 8/20/96 REVISED 1/14/97 APPROVED FOR PREPARED BY: David Scarmardo & Sam Campise P .O. Box 5408 McCLURE ENGINEERING, INC. 1722 Broadmoor, Suite 210 Bryan, Texas 77805 Bryan , Texas 77802 CERTIFICATION I, Michael R McClure, Registered Professional Engineer No. 32740, State of Texas, certify that this report for the revised drainage design of GRAND OAKS SUBDMSION, was prepared by me in accordance with the provisions of the City of College · Station Drainage Policy and Design Standards for the owners thereof. Michael R. McClure, P .E. __ ,,, --~~OF /~\\ -~\>-•••••••••• -+-..,. t " . . ..... $0 •• •• * ··.,\SI •• '* .. .. * r.,i t*: '*'-' ~···································1 l .. Mlf J:tA..~h.BJY'.99h~~~-·I ~~ ... '9 32740 ~/llJ 't,"R.::.f.CJ1sTt:.<r.~··;~ ''.Ss ••••••• ~v .. \\ 10NAL '(;:-~ .......... ,....-~ INTRODUCTION TABLE OF CONTENTS GRAND OAKS SUBDIVISION GENERAL LOCATION AND DESCRIPTION PRIMARY DRAINAGE BASIN DESCRIPTION DRAINAGE FACILITY DESIGN DRAINAGE DESIGN CRITERIA CONCLUSION TABLE OF EXHIBITS EXCERPT FROM FEMA MAP OVERLAND RELIEF FORD.A. #4 5 -100 YEAR HYDROGRAPHS DETENTION POND ROUTING DRAINAGE AREA MAP PaiieNo. I I 2 2 3 5 "A" "B" "C" "D" "E" INTRODUCTION: STORM DRAINAGE REPORT GRAND OAKS SUBDIVISION This storm drainage report is intended to cover the necessary drainage improvements for the Grand Oaks Subdivision including the detention. The parameters used for design and the existing conditions of the on site area are incorporated to show how the final drainage design will accomplish the desired drainage objectives per the City of College Station Drainage Policy and Design Standards (DPDS.) GENERAL LOCATION AND DESCRIPTION: Grand Oaks Subdivision is located in the northeastern portion of College Station. The site has frontage along the south side of Lincoln Drive and is approximately 500' east of Munson A venue. The site is adjacent to Sweet Briar Subdivision (to the south), Carter 's Grove , Second Installment (to the east), and is a replat of a portion of Lots 1and2 of Woodland Estates. Two Lincoln Place subdivision is across Lincoln Avenue and slightly to the west. Sheet 7 of the project Construction Plans is included in this drainage report to show a general location , a Drainage Area Map , and Drainage Computations. The site is heavily wooded and gently rolling with an average of 3% slopes. The site is currently undeveloped. PRIMARY DRAINAGE BASIN DESCRIPTION: .. =-·. The entire site (5.704 Acres) drains to the north, into the Lincoln Avenue right-of-way and eventually to Burton Creek. Most of the area is controlled by an existing inlet located in front of the site. This inlet (called inlet nmnber 8) will continue to control roughly the same area. Water from the Sweet Briar Subdivision in Drainage Area Nos. 1 & 2 sheet flows across the southerly property line of the proposed GRAND OAKS SUBDIVISION. Concentrated flows from Drainage Area No. 9 are released without an easement or an adequate drainage path to the stonn drain system in Lincoln Avenue. At the request of the city, this water will be intercepted with a stonn drain system that is proposed near the east comer of this development The drainage will then be conveyed via the stOnn drain to the beforementioned inlet No. 8 and finally into a tributary of Burton Creek. A small area (labeled Drainage Area No . 10) does not flow to inlet No. 8, but will be released to the curb line of Lincoln A venue. This area currently drains to Lincoln A venue and its flow characteristics are not significantly changed from its predeveloped condition No portion of the site is within the 100 year flood plain per the Federal Emergency Management Agency's Flood Insurance Rate Map No. 48041C0142 C, dated July 2, 1992 (see Exhibit "A"). DRAINAGE FAcn.ITY DESIGN: The proposed drainage patterns will not significantly alter the existing conditions. Stonn water traverses the site in sheet flow. This condition will be modified in that some of the sheet flow will be concentrated in curb lines and captured in curb inlets and conveyed to the detention facility 2 in concrete pipes. Sheet 7 of the Construction Plans contains the rational calculations for the various drainage areas corresponding to the Drainage Area Map. Sheet 7 also shows the computations to verify the size of the proposed inlets and pipes . DRAINAGE DESIGN CRITERIA: ·-All drainage design is in accontance with the City DPDS. The design storm is the 10-year event Flow calculations for all drainage areas are based on the Rational Method (see Sheet 7). Inlet sizing is based on the calculated capacity of a standard recessed inlet for the design street slopes. Pipe sizing is in accordance with Manning's Equation with an "n" of .014 per the DPDS. The storm drains in the streets are designed to convey the 10-year flow with the hydraulic grade line at least .5 ' below the gutter line of the street Flow calculations for the required detention facilities use a triangular hydrograph (base = 3 * Tc) and peak flows computed using the rational method. The routings are presented in Tabular form (see Exhibit "C"). The detention basin outlet control structure is designed using a single 12" diameter orifice located at the bottom of the detention facility. Orifice flow is based on the equation Q = C *A* (2 • g * H )"1/2 where C = .40 (Note that the coefficient is lowered to better match a constricted outfall) A = area of opening H = head in feet, measured from center of orifice g = 32.2 ft/ sec"2 Exhibit "C" shows a graphical representation of the effectiveness of the detention system. 3 Please note that the hydrograph labeled 1,4,5 represents the flow entering the proposed detention pond (Drainage Area Nos. 1, 4 & 5). The hydrograph labeled 2,3, 6-10 identifies the flow characteristics from the Drainage Areas that .d.o.rull enter the pond (Drainage Area Nos. 2, 3 , 6, 7, 8, 9 & 10). The hydrograph labeled IE is the sum of the existing Drainage Areas 1through10. Their peak runoff flows are shown on Sheet 7 of the Construction Plans and as included in this report. Exhibit "D" indicates the calculation of the storage routing in tabular fonn. The hydrograph labeled Pond (Q n+ 1) and "Total Proposed" are computed in these exhibits. The flows at the study p0int (the existing Inlet No. 8) are shown in Table 1. TABLE 1 Storm Event 100-year 50-year 25-year 10-year S-year Existing ( cfs) 68 60 53 46 41 Proposed ( cfs) 68 60 53 46 41 Peak W.S. Elev. 301.83 301.80 301.76 301.5 301.31 in Pond* *Top of Wall= 301.75' Drainage Area No. 4 has a low point inlet which will require an overland relief for flows in excess of the 10-year stonn. This excess is less than 2 cfs in this case. A swale (as shown in Exhibit "B") will be provided to handle this flow. For the stonn events studied (5, 10, 25, 50 & 100-year events), the combined peak discharge for those drainage areas contributing to the detention pond , as well as circumventing the pond , is 4 equal to the peak discharge for the undeveloped drainage areas. The results are smnmarized in Table 1. Note that the maximum water surface elevation in the pond is slightly above the overflow spillway elevation 301.75. Freeboard is provided for the 5 & 10 storm events. In the event larger storms occur, the overflow will enter the Lincoln A venue right-of-way and discharge into the tributary of Burton Creek. CONCLUSION: The drainage design for this subdivision meets the requirements as stated in the City of College Station Drainage Policy and Design Standards. 5 ZONE X ./ ,,·· / JOIN S PAN E L 0144 PROPOSED GRANO OAKS ZONE X ·' City of College Station 480083 flK). 48041C0142 C (7/2 /9 2 ) · ... < --· • '· ' EXHIBIT B GRAND OAKS OVERLAND RE'.tlEF FOR D.A.:. #4 Exlsiting Ground Min . Slope 1% Min . Depth . 75' Flow Depth = 0.5T I 7~75' Proposed Storm Drain Grand Oaks Subdivision 5 Year Event Hydrograph 40 .00 35.00 30.00 25.00 i a 20 .00 15.00 10.00 5 .00 0 .00+-~~~~+-~~~~+-~~~~+"'"~~~~+-~~~~+-~~~~+-~~~--1 0 .00 5.00 10.00 15.00 20 .00 25 .00 30.00 35.00 Time (min.) --1,4 ,5 --Qn+1 (-po ,,.ft::.) 2 ,3 ,6-10 --TOTAL PROPOSED - - -1E 1/15/97 Exhibit C Grand Oaks Subdivision 10 Year Event Hydrograph 45.00 40.00 35.00 30.00 ~ .!:!. 25.00 a 20.00 15.00 10.00 5 .00 0 .00~~~~~-+-~~~~-+-~~~~-+_,__~~~___,1--~~~~+-~~~~-+-~~~~~ 0 .00 5 .00 10.00 15.00 20.00 25 .00 30.00 35.00 Time (min.) --1,4 ,5 --Qn+1 2 ,3 ,6-10 --TOTAL PROPOSED ---1E 1/15/97 Exhibit C Grand Oaks Subdivision 25 Year Event Hydrograph 50.00 40.00 i" ~ 30.00 a 20.00 10.00 0.00---~~~~-+-~~~~-+-~~~~--+---~~~--f--~~~~--~~~~--~~~~-1 0 .00 5 .00 10.00 15 .00 20 .00 25 .00 30.00 35.00 Tlme(min.) --1,4,5 --Qn+1 2 ,3 ,6-10 --TOTAL PROPOSED - - -1E 1/15/97 Exhibit C Grand Oaks Subdivision 50 Year Event Hydrograph 70.00 .,..-----·----------------------------·----. 6d .oo 50.00 40.oo 30.00 2d.oo 1d.OO 0.00-------+-----+-----+"'"'--------+---------+---------+-------l 0 .00 5.00 10 .00 15 .00 20 .00 25 .00 30.00 35.00 Time (min.) --1,4 ,5 --Qn+1 2,3,6-10 --TOTAL PROPOSED ---1E 1/15/97 Exhibit C ·: ., ... r .. '· ... ~ , . .... '. . • . .. , · . " ; · . ., Grand Oaks Subdivision 100 Year Event Hydrograph 70 .00 ...---- 60 .00 50.00 40.00 :i ..2. 0 30.00 20 .00 10.00 0 .00+-~~~~+--~~~~+--~~~~+"""---------+----------+----------+---~~---i 0 .00 5 .00 10.00 15 .00 20 .00 25.00 30.00 35.00 Time(min.) --1.4,5 --Qn+1 2 ,3 ,6-10 --TOTAL PROPOSED ---1E 1/13/97 Exhibit C EXHIBIT"D" PROPOSED DETENTION POND ROUTING Grand Oaks Subdivision D.A. # Pond Routing EVENT .. 5 D.A.# • c i. a t. ca c c ... :!:! 0 f .... a 0 'C i .... + I .... I It) c ~ + .... co -g, ..; + c + c > cw; Cl) "' c 0 ..! ::r: .... .E N N a 0. UJ N' Qp 17.6 36.4 Tc 5.2 13.1 Inc 0.5 Time cfs cfs cfs cfs cfs ft cfs 21.5 0.0 0.00 172.58 181.51 4.47 300.7 24.7 22.0 0.0 0.00 163.73 172.58 4.43 300.6 24.0 22.5 0.0 0.00 154.96 163.73 4.38 300.5 23.3 23.0 0.0 0.00 146.27 154.96 4.34 300.5 22.6 23.5 0.0 0.00 137.66 146.27 4.30 300.4 21.9 24.0 0.0 0.00 129.14 137.66 4.26 300.4 21.2 24.5 0.0 0.00 120.69 129.14 4.22 300.3 20.5 25.0 0.0 0.00 112.32 120.69 4.18 300.3 19.9 25.5 0.0 0.00 104.03 112.32 4.14 300.2 19.2 26.0 0.0 0.00 95.82 104.03 4.11 300.2 18.5 26.5 0.0 0.00 87.68 95.82 4.07 300.1 17.8 27.0 0.0 0.00 79.62 87.68 4.03 300.1 17.1 27.5 0.0 0.00 71.64 79.62 3:99 300.0 16.4 28.0 0.0 0.00 63.85 71.64 3.89 299.9 15.7 28.5 0.0 0.00 56.29 63.85 3.78 299.8 15.0 29.0 0.0 0.00 48.94 56.29 3.67 299.7 14.3 29.5 0.0 0.00 41.80 48.94 3.57 299.5 13.6 30.0 0.0 0.00 34.87 41.80 3.47 299.4 12.9 30.5 0.0 0.00 28.12 34.87 3.37 299.3 12.2 31.0 0.0 0.00 21.58 28.12 3.27 299.2 11.5 31.5 0.0 0.00 15.21 21.58 3.18 299.1 10.8 32.0 0.0 0.00 9.03 15.21 3.09 299.0 10.1 PEAK FLOWS 17.1 4.9 301.30 36.1 0.00 indicates inital condition c w "' -I 0 <( 0. I-0 0 « I-0. cfs 29.18 28.45 27.71 26.98 26.24 25.51 24.77 24.04 23.31 22.57 21.84 21.11 20.38 19.58 18.78 17.98 17.18 16.38 15.59 14.80 14.01 13.23 41.0 C) -I ~ ~~-oxw I-w :::. 9603-dra.xls Exhibit D cfs 28.14 27.35 26.56 25.77 24.97 24.18 23.39 22.60 21.81 21.02 20.22 19.43 18.64 17.85 17.06 16.27 15.47 14.68 13.89 13.10 12.31 11.52 41.2 EXHIBIT "D" PROPOSED DETENTION POND ROUTING Grand Oaks Subdivision D.A.# Pond Routing EVENT-= 5 D.A.# 'It c &. a Q. + Cl c .. c ... :!;? 0 ~ .... a 0 + I .... ,, i .... c .. + .... I II) :!;? + c > co ,, ..: + c M >. "' ~ c 0 .!! :::c .... c N a ~w N" Qp 17.6 36.4 Tc 5.2 13.1 inc 0.5 Time cfs cfs cfs .. cfs cfs ft cfs 0.0 0.0 1.69 0.00 0.00 0.00 297.5 0.0 0.5 1.7 5.07 -1.69 1.69 1.69 298.0 1.4 1.0 3.4 8.45 -0.50 3.38 1.94 298.1 2.8 1.5 5.1 11.83 3.16 7.95 2.39 298.5 4.2 2.0 6.8 15.21 8.82 15.00 3.09 299.0 5.6 2.5 8.5 18.60 17.60 24.03 3.22 299.1 6.9 3.0 10.1 21.98 29.42 36.19 3.39 299.3 8.3 3.5 11.8 25.36 44.18 51.39 3.60 299.6 9.7 4.0 13.5 28.74 61.82 69.54 3.86 299.9 11.1 4.5 15.2 32.12 82.47 90.56 4.04 300.1 12.5 5.0 16.9 33.98 106.28 114.59 4.16 300.2 13.9 5.5 17.1 33.30 131.71 140.26 4.28 300.4 15.3 6.0 16.2 31.61 156.23 165.01 4.39 300.6 16.7 6.5 15.4 29.92 178.84 187:84 4.50 300.7 18.1 7.0 14.5 28.23 199.58 208.77 4.59 300.8 19.4 7.5 13.7 26.54 218.44 227.81 4.68 301.0 20.8 8.0 12.8 24.85 235.50 244.98 4.74 301.0 22.2 8.5 12.0 23.16 250.80 260.35 4.77 301.1 23.6 9.0 11.2 21.47 264.35 273.96 4.81 301.1 25.0 9.5 10.3 19.78 276.16 285.82 4.83 301.2 26.4 10.0 9.5 18.09 286.23 295.94 4.86 301.2 27.8 10.5 8.6 16.40 294.57 304.31 4.87 301.2 29.2 11.0 7.8 14.71 301.19 310.96 4.89 301.3 30.5 11.5 6.9 13.02 306.09 315.89 4.90 301.3 31.9 12.0 6.1 11.33 309.29 319.11 4.91 301.3 33.3 12.5 5.2 9.64 310.80 320.62 4.91 301.3 34.7 13.0 4.4 7.95 310.61 320.43 4.91 301.3 36.1 13.5 3.6 6.25 308.75 318.56 4.91 301.3 35.8 14.0 2.7 4.56 305.20 315.00 4.90 301.3 35.1 14.5 1.9 2.87 299.99 309.77 4.89 301.3 34.4 15.0 1.0 1.18 293.13 302.87 4.87 301.2 33.7 15.5 0.2 0.17 284.61 294.31 4.85 301.2 33.0 16.0 0.0 0.00 275.12 . 284.78 4.83 301.2 32.4 16.5 0.0 0.00 265.50 275.12 4.81 301.1 31.7 17.0 0.0 0.00 255.93 265.50 4.79 301.1 31.0 17.5 0.0 0.00 246.40 255.93 4.76 301.1 30.3 18.0 0.0 0.00 236.91 246.40 4.74 301.0 29.6 18.5 0.0 0.00 227.47 236.91 4.72 301.0 28.9 19.0 0.0 0.00 218.11 227.47 4.68 301.0 28.2 19.5 0.0 0.00 208.83 218.11 4.64 300.9 27.5 20.0 0.0 0.00 199.64 208.83 4.60 300.8 26.8 20.5 0.0 0.00 190.53 199.64 4.55 300.8 26.1 21.0 0.0 0.00 181.51 190.53 4.51 300.7 25.4 0. 00 indicates in ital condition c w "' _. 0 ct ~ I-0 0 0:: I-~ cfs 0.00 3.08 4.72 6.56 8.64 10.16 11.72 13.32 14.97 16.54 18.04 19.55 21.05 22.55 24.03 25.51 26.96 28.38 29.80 31.21 32.63 34.03 35.44 36.84 38.23 39.62 41.01 40.73 40.03 39.32 38.61 37.90 37.18 36.47 35.75 35.03 34.32 33.60 32.87 32.13 31.39 30.66 29.92 0 _. ~ ct I-I-"' -oxw I-w ~ 9603-dra.xls Exhibit D cfs 0.00 1.58 3.17 4.75 6.33 7.92 9.50 11.08 12.67 14.25 15.83 17.41 19.00 . 20.58 22.16 23.75 25.33 26.91 28.50 30.08 31.66 33.25 34.83 36.41 38.00 39.58 41.16 40.81 40.01 39.22 38.43 37.64 36.85 36.06 35.26 34.47 33.68 32.89 32.10 31.31 30.52 29.72 28.93 EXHIBIT "D" PROPOSED DETENTION PONO ROUTING Grand Oaks Subdivision D.A. # ·Pond Routing EVENT• 10 D.A.# ... c a a ~ " c c .. 0 ~ .... a 0 "C i .... + ~ .... I c + .... .,, + c > co "C ..; + -c cw; >-Cl) Cl) c 0 .! :r: .... .E N N a Q. w N" Qp 19.6 41.0 Tc 5.2 13.1 inc 0.5 TI me cfs cfs cf& cfs cf& ft cf& 0.0 0.0 1.88 0.00 0.00 0.00 297.5 0.0 0.5 1.9 5.65 -1.70 1.88 1.79 298.0 1.6 1.0 3.8 9.42 -0.04 3.95 2.00 298.2 3.1 1.5 5.7 13.19 4.31 9.38 2.54 298.6 4.7 2.0 7.5 16.96 11.26 17.50 3.12 299.0 6.3 2.5 9.4 20.73 21.67 28.22 3.28 299.2 7.8 3.0 11.3 24.50 35.45 42.40 3.48 299.4 9.4 3.5 13.2 28.27 52.50 59.95 3.73 299.7 10.9 4.0 15.1 32.04 72.78 80.77 4.00 300.0 12.5 4.5 17.0 35.81 96.60 104.82 4.11 300.2 14.1 5.0 18.8 37.89 123.94 132.42 4.24 300.3 15.6 5.5 19.0 37.13 153.08 161.83 4.38 300.5 17.2 6.0 18.1 35.25 181.19 190.21 4.51 300.7 18.8 6.5 17.2 33.36 207.18 216.44 4.63 300.9 20.3 7.0 16.2 31.48 231.08 240.54 4.73 301.0 21.9 7.5 15.3 29.59 253.00 262.56 4.78 301.1 23.5 8.0 14.3 27.71 272.95 282.60 4.82 301.2 25.0 8.5 13.4 25.82 290.92 300.66 4.87 301.2 26.6 9.0 12.4 23.94 306.94 316.75 4.90 301.3 28.1 9.5 11.5 22.05 321.01 330.88 4.93 301.3 29.7 10.0 10.6 20.17 333.14 343.07 4.96 301.4 31.3 10.5 9.6 18.28 343.34 353.31 4.99 301.4 32.8 11.0 8.7 16.40 351.62 361.63 5.00 301.4 34.4 11.5 7.7 14.51 357.98 368.02 5.02 301.5 36.0 12.0 6.8 12.63 362.44 372.49 5.03 301.5 37.5 12.5 5.8 10.74 365.00 375.07 5.03 301.5 39.1 13.0 4.9 8.86 365.67 375.74 5.04 301.5 40.7 13.5 4.0 6.97 364.46 374.53 5.03 301.5 40.3 14.0 3.0 5.09 361.38 371.44 5.03 301.5 39.6 14.5 2.1 3.20 356.44 366.47 5.02 301.5 38.8 15.0 1.1 1.32 349.65 359.65 5.00 301.4 38.0 15.5 0.2 0.19 341.01 350.97 4.98 301.4 37.2 16.0 0.0 0.00 331.28 341.20 4.96 301.4 36.4 16.5 0.0 0.00 321.41 331.28 4.94 301.3 35.7 17.0 0.0 0.00 311.58 321.41 4.91 301.3 34.9 17.5 0.0 0.00 301.80 311.58 4.89 301.3 34.1 18.0 0.0 0.00 292.07 301.80 4.87 301.2 33.3 18.5 0.0 0.00 282.37 292.07 4.85 301.2 32.5 19.0 0.0 0.00 272.72 282.37 4.82 301.2 31.7 19.5 0.0 0.00 263.12 272.72 4.80 301.1 31.0 20.0 0.0 0.00 253.56 263.12 4.78 301.1 30.2 20.5 0.0 0.00 244.04 253.56 4.76 301.1 29.4 21.0 0.0 0.00 234.56 244.04 4.74 301.0 28.6 0.00 indicates inital condition 0 w Cl) ..J 0 <( Q. I-0 0 IX I-Q. cfs 0.00 3.36 5.13 7.23 9.38 11.10 12.86 14.67 16.51 18.18 19.88 21.58 23.27 24.96 26.62 28.24 29.85 31.45 33.05 34.65 36.24 37.83 39.41 40.99 42.56 44.13 45.70 45.38 44.59 43.80 43.00 42.20 41.39 40.59 39.79 38.98 38.18 37.37 36.57 35.77 34.96 34.16 33.36 0 ..J ~ <( I-I-Cl) --w e >< .... W-9603-dra.xls Exhibit D cfs 0.00 1.78 3.57 5.35 7.13 8.92 10.70 12.48 14.26 16.05 17.83 19.61 21.40 23.18 24.96 26.75 28.53 30.31 32.09 33.88 35.66 37.44 39.23 41.01 42.79 44.58 46.36 45.96 45.07 44.17 43.28 42.39 41.50 40.61 39.72 38.82 37.93 37.04 36.15 35.26 34.37 33.48 32.58 EXHIBIT"O" PROPOSED DETENTION PONO ROUTING Grand Oaks Subdivision D.A.# Pond Routing EVENT= 10 D.A.# 'II: c ~ CJ Q. + • c -c ... ~ 0 8' ..... CJ 0 .. ..... + I ..... ..... "'O Cl I ... .,, c ~ + co "'O ·or: + c + c > ft) >-~ UJ c 0 .!! ::c ..... c N CJ 0.. w f'i Qp 19.6 41.0 Tc 5.2 13.1 Inc 0.5 Time cfs cfs cfs .. cfs cfs .ft cfs 21.5 0.0 0.00 225.13 234.56 4.72 301.0 27.8 22.0 0.0 0.00 215.79 225.13 4.67 300.9 27.1 22.5 0.0 0.00 206.54 215.79 4.63 300.9 26.3 23.0 0.0 0.00 197.37 206.54 4.58 300.8 25.5 23.5 0.0 0.00 188.28 197.37 4.54 300.8 24.7 24.0 0.0 0.00 179.28 188.28 4.50 300.7 23.9 24.5 0.0 0.00 170.37 179.28 4.46 300.6 23.1 25.0 0.0 0.00 161.54 170.37 4.42 300.6 22.4 25.5 0.0 0.00 152.79 161.54 4.37 300.5 21.6 26.0 0.0 0.00 144.12 152.79 4.33 300.5 20.8 26.5 0.0 0.00 135.53 144.12 4.29 300.4 20.0 27.0 0.0 0.00 127.03 135.53 4.25 300.4 19.2 27.5 0.0 ·o.oo 118.60 127.03 4.21 300.3 18.5 28.0 0.0 0.00 110.25 118.60 4.17 300.3 17.7 28.5 0.0 0.00 101.98 110.25 4.14 300.2 16.9 29.0 0.0 0.00 93.79 101.98 4.10 300.2 16.1 29.5 0.0 0.00 85.67 93.79 4.06 300.1 15.3 30.0 0.0 0.00 77.63 85.67 4.02 300.0 14.5 30.5 0.0 0.00 69.68 77.63 3.98 300.0 13.8 31.0 0.0 0.00 61.95 69.68 3.86 299.9 13.0 31.5 0.0 0.00 54.44 61.95 3.75 299.7 12.2 32.0 0.0 0.00 47.14 54.44 3.65 299.6 11.4 PEAK FLOWS 19.0 5.0 301.50 40.7 0. 00 indicates in ital condition c w UJ ..J 0 <( 0.. I-0 0 0: I-0.. cfs 32.55 31.73 30.90 30.07 29.25 28.43 27.60 26.78 25.96 25.13 24.31 23.49 22.67 21.85 21.02 20.20 19.38 18.56 17.74 16.84 15.95 15.06 45.7 C> ...J ~ <( I-""" en ..-. Q~W I-:::.. 9603-dra.xls Exhibit D cfs 31.69 30.80 29.91 29.02 28.13 27.24 26.34 25.45 24.56 23.67 22.78 21.89 20.99 20.10 19.21 18.32 17.43 16.54 15.65 14.75 13.86 12.97 46.4 EXHIBIT "D" PROPOSED DETENTION POND ROUTING Grand Oaks Subdivision DA# Pond Routing EVENT• 25 D.A.# 'II: c a a as + c c -~ ~ .2 ~ .... q 0 + .... "O 1i .... I It) .E -+ .... co "O ~ ~ c + c > cw; >-+ VJ VJ c 0 ..!! ::c .... c N N a Q. UJ C'i Qp 22.3 46.9 Tc 5.2 13.1 Inc 0.5 Time cfs cfs cfs cfs cf9 ft cfs 0.0 0.0 2.15 0.00 0.00 0.00 297.5 0.0 0.5 2.1 6.44 -1.49 2.15 1.82 298.0 1.8 1.0 4.3 10.73 0.76 4.95 2.10 298.2 3.6 1.5 6.4 15.03 6.00 11.49 2.75 298.7 5.4 2.0 8.6 19.32 14.68 21.03 3.17 299.1 7.2 2.5 10.7 23.62 27.29 34.00 3.36 299.3 8.9 3.0 12.9 27.91 43.71 50.90 3.60 299.6 10.7 3.5 15.0 32.20 63.84 71.62 3.89 299.9 12.5 4.0 17.2 36.50 87.90 96.04 4.07 300.1 14.3 4.5 19.3 40.79 116.00 124.40 4.20 300.3 16.1 5.0 21.5 43.15 148.09 156.79 4.35 300.5 17.9 5.5 21.7 42.30 182.22 191.24 4.51 300.7 19.7 6.0 20.6 40.15 215.17 224.51 4.67 300.9 21.5 6.5 19.5 38.00 245.80 255.32 4.76 301.1 23.3 7.0 18.5 35.85 274.14 283.80 4.83 301.2 25.0 7.5 17.4 33.71 300.22 310.00 4.89 301.3 26.8 8.0 16.3 31.56 324.05 333.93 4.94 301.4 28.6 8.5 15.2 29.41 345.63 355.61 4.99 301.4 30.4 9.0 14.2 27.27 364.97 375.04 5.03 301.5 32.2 9.5 13.1 25.12 382.09 392.24 5.07 301.6 34.0 10.0 12.0 22.97 397.00 407.21 5.11 301.6 35.8 10.5 10.9 20.83 409.70 419.97 5.14 301.7 37.6 11.0 9.9 18.68 420.20 430.52 5.16 301.7 39.3 11.5 8.8 16.53 428.52 438.88 5.18 301.7 41.1 12.0 7.7 14.38 434.67 445.06 5.19 301.7 42.9 12.5 6.7 12.24 437.38 449.05 5.84 301.8 44.7 13.0 5.6 10.09 437.61 449.62 6.00 301.8 46.5 13.5 4.5 7.94 436.82 447.70 5.44 301.8 46.1 14.0 3.4 5.80 434.38 444.76 5.19 301.7 45.2 14.5 2.4 3.65 429.81 440.18 5.18 301.7 44.4 15.0 1.3 1.50 423.13 433.46 5.17 301.7 43.5 15.5 0.2 0.21 414.34 424.63 5.15 301.7 42.6 16.0 0.0 0.00 404.30 414.55 5.12 301.6 41.7 16.5 0.0 0.00 394.10 404.30 5.10 301.6 40.8 17.0 0.0 0.00 383.95 394.10 5.08 301.6 39.9 17.5 0.0 0.00 373.84 383.95 5.05 301.5 39.0 18.0 0.0 0.00 363.77 373.84 5.03 301.5 38.1 18.5 0.0 0.00 353.75 363.77 5.01 301.5 37.2 19.0 0.0 0.00 343.78 353.75 4.99 301.4 36.3 19.5 0.0 0.00 333.85 343.78 4.96 301.4 35.4 20.0 0.0 0.00 323.97 333.85 4.94 301.4 34.5 20.5 0.0 0.00 314.14 323.97 4.92 301.3 33.6 21.0 0.0 0.00 304.34 314.14 4.90 301.3 32.7 0. 00 indicates in ital condition 0 UJ VJ _. 0 <( Q. t-0 0 a: t-Q. cfs 0.00 3.61 5.67 8.11 10.33 12.30 14.33 16.41 18.38 20.30 22.24 24.19 26.13 28.01 29.87 31.71 33.56 35.40 37.23 39.06 40.88 42.70 44.51 46.32 48.12 50.55 52.50 51.58 50.44 49.54 48.63 47.71 46.80 45.88 44.96 44.04 43.13 42.21 41.29 40.38 39.46 38.54 37.63 0 _. ~ <( t-t-VJ --0 >< UJ t-UJ ~ 9603-dra.xls Exhibit 0 cfs 0.00 2.04 4.08 6.12 8.16 10.20 12.24 14.27 16.31 18.35 20.39 22.43 24.47 26.51 28.55 30.59 32.63 34.67 36.71 38.75 40.78 42.82 44.86 46.90 48.94 50.98 53.02 52.56 51.54 50.52 49.50 48.48 47.46 46.44 45.42 44.40 43.38 42.36 41.34 40.33 39.31 38.29 37.27 EXHIBIT "D" PROPOSED DETENTION POND ROUTING Grand Oaks Subdivision D.A. # Pond Routing EVENT:.: 25 D.A. # 'It c .s::; a c. + as c -c ... :!:? 0 8' ... a 0 :;:; ... + I -.... -o as I ... .,, c -+ co ,, + c > ,, ~ + -c M' >. rn rn c 0 .! :c .... .= N N a Q. UJ N' Qp 22.3 46.9 Tc 5.2 13.1 Inc 0.5 Time cfs cfs cfs . cfs cfs ft cfs 21.5 0.0 0.00 294.59 304.34 4.87 -301.2 31.8 22.0 0.0 0.00 284.89 294.59 4.85 301.2 30.9 22.5 0.0 0.00 275.23 284.89 4.83 301.2 30.0 23.0 0.0 0.00 265.61 275.23 4.81 301.1 29.2 23.5 0.0 0.00 256.04 265.61 4.79 301.1 28.3 24.0 0.0 0.00 246.51 256.04 4.76 301.1 27.4 24.5 0.0 0.00 237.02 246.51 4.74 301.0 26.5 25.0 0.0 0.00 227.58 237.02 4.72 301.0 25.6 25.5 0.0 0.00 218.22 227.58 4.68 301.0 24.7 26.0 0.0 0.00 208.94 218.22 4.64 300.9 23.8 26.5 0.0 0.00 199.75 208.94 4.60 300.8 22.9 27.0 0.0 0.00 190.64 199.75 4.55 300.8 22.0 27.5 0.0 0.00 181.62 . 190.64 4.51 300.7 21.1 28.0 0.0 0.00 172.68 181.62 4.47 300.7 20.2 28.5 0.0 0.00 163.83 172.68 4.43 300.6 19.3 29.0 0.0 0.00 155.06 163.83 4.39 300.5 18.4 29.5 0.0 0.00 146.37 155.06 4.34 300.5 17.5 30.0 0.0 0.00 137.76 146.37 4.30 300.4 16.6 30.5 0.0 0.00 129.24 137.76 4.26 300.4 15.7 31.0 0.0 0.00 120.79 129.24 4.22 300.3 14.8 31.5 0.0 0.00 112.42 120.79 4.18 300.3 14.0 32.0 0.0 0.00 104.13 112.42 4.15 300.2 13.1 PEAK FLOWS 21.7 6.0 301.76 46.5 0.00 indicates inital condition 0 UJ rn ..J 0 < Q. t-0 0 0:: t-Q. cfs 36.71 35.79 34.88 33.96 33.04 32.13 31.21 30.30 29.36 28.43 27.49 26.55 25.61 24.68 23.74 22.81 21.87 20.94 20.00 19.07 18.13 17.20 52.5 0 ..J ~ < t-t-rn -0 x UJ t-UJ :!:.. 9603-dra.xls Exhibit D cfs 36.25 35.23 34.21 33.19 32.17 31.15 30.13 29.11 28.09 27.07 26.05 25.03 24.01 22.99 21.97 20.95 19.93 18.91 17.89 16.87 15.85 14.83 53.0 EXHIBIT "D" PROPOSED DETENTION POND ROUTING Grand Oaks Subdivision D.A.# Pond Routing EVENT• 50 D.A. # =It: c &:. a 0. ~ Cll c c ... 0 0 2 .... a + I .... 'O ~ .... c -+ .... I .,, ~ + c > U) 'O ~ + c M' >-Cl) (1) c 0 .! :I: .... .E N N a a. w N' Qp 25.2 53.0 Tc 5.2 13.1 inc 0.5 Time cfs cfs cfs cfs cfs ft cfs 0.0 0.0 2.42 0.00 0.00 0.00 297.5 0.0 0.5 2.4 7.26 -1.27 2.42 1.85 298.0 2.0 1.0 4.8 12.10 1.59 5.99 2.20 298.3 4.0 1.5 7.3 16.94 7.76 13.69 2.96 298.9 6.1 2.0 9.7 21.78 18.25 24.71 3.23 299.2 8.1 2.5 12.1 26.63 33.15 40.04 3.44 299.4 10.1 3.0 14.5 31.47 52.33 59.78 3.72 299.7 12.1 3.5 16.9 36.31 75.77 83.79 4.01 300.0 14.2 4.0 19.4 41.15 103.79 112.08 4.14 300.2 16.2 4.5 21.8 45.99 136.34 144.94 4.30 300.4 18.2 5.0 24.2 48.65 173.39 182.33 4 .. AI 300.7 20.2 5.5 24.4 47.68 212.73 222.04 4..66. 300.9 22.3 6.0 23.2 45.26 250.86 260.41 4.I1 301.1 24.3 6.5 22.0 42.84 286.41 296.12 _4-Bli 301.2 26.3 7.0 20.8 40.42 319.39 329.25 4.._Q3 301.3 28.3 7.5 19.6 38.00 349.81 3.5.9.81 _5..00 301.4 30.4 8.0 18.4 35.58 377.69.. 3.87.82 _5._00 301.5 32.4 8.5 17.2 33.16 403.03 413.27 5_12 301.6 34.4 9.0 16.0 30.74 425_&t 436.19 5_17 301.7 36.4 9.5 14.8 28.32 440.48 456.58 8.05 301.8 38.5 10.0 13.6 25.90 445.51 468.80 t.1...64 301.8 40.5 10.5 12.3 23.48 446.59 471.41 12..41 301.8 42.5 11.0 11.1 21.06 446.04 470.07 12.02 301.8 44.5 11.5 9.9 18.64 444.81 467.10 11.14 301.8 46.6 12.0 8.7 16.22 443.31 463.45 10.07 301.8 48.6 12.5 7.5 13.80 441.69 459.53 8.92 301.8 50.6 13.0 6.3 11.38 440.03 455.49 7.73 301.8 52.6 13.5 5.1 8.96 438.35 451.41 6.53 301.8 52.2 14.0 3.9 6.54 436.66 447.30 5.32 301.8 51.2 14.5 2.7 4.11 432.81 443.19 5.19 301.7 50.2 15.0 1.5 1.69 426.58 436.93 5.17 301.7 49.2 15.5 0.2 0.24 417.96 428.27 5.16 301.7 48.2 16.0 0.0 0.00 407.94 418.20 5.13 301.6 47.2 16.5 0.0 0.00 397.72 407.94 5.11 301.6 46.2 17.0 0.0 0.00 387.55 397.72 5.09 301.6 45.1 17.5 0.0 0.00 377.42 387.55 5.06 301.5 44.1 18.0 0.0 0.00 367.34 377.42 5.04 301.5 43.1 18.5 0.0 0.00 357.31 367.34 5.02 301.5 42.1 19.0 0.0 0.00 347.32 357.31 4.99 301.4 41.1 19.5 0.0 0.00 337.38 347.32 4.97 301.4 40.1 20.0 0.0 0.00 327.48 337.38 4.95 301.4 39.1 20.5 0.0 0.00 317.63 327.48 4.93 301.3 38.1 21.0 0.0 0.00 307.82 317.63 4.90 301.3 37.1 0.00 indicates inital condition c UJ Cl) ...J 0 < a. fo-0 0 0::: .... a. cfs 0.00 3.87 6.25 9.04 11.32 13.57 15.87 18.18 20.34 22.52 24.72 26.93 29.07 31.18 33.28 35.37 37.46 39.54 41.62 46.52 52.13 54.93 56.56 57.71 58.66 59.53 60.37 58.76 56.55 55.40 54.37 53.34 52.31 51.27 50.23 49.20 48.16 47.13 46.09 45.06 44.02 42.99 41.95 0 ...J ~ < .... .... Cl) .... 0 x UJ .... UJ ::. 9603-dra.xls Exhibit D cfs 0.00 2.31 4.62 6.93 9.23 11.54 13.85 16.16 18.47 20.78 23.08 25.39 27.70 30.01 32.32 34.63 36.93 39.24 41.55 43.86 46.17 48.48 50.79 53.09 55.40 57.71 60.02 59.50 58.34 57.19 56.04 54.88 53.73 52.57 51.42 50.26 49.11 47.96 46.80 45.65 44.49 43.34 42.19 EXHIBIT"D" PROPOSED DETENTION POND ROUTING Grand OakS-Subdivision D.A.# Pond Routing EVENT .. 50 D.A. # -c .i= CJ Q, t. ftl c c ... 'tJ 0 8' ..... CJ 0 -'tJ i ..... + I ..... I ... II) c -+ ..... co_ 'tJ ...; + 'tJ c + c ii -c M >. .: en en CJ 0-:::c ..... N N '1. w N Qp 25.2 53.0 Tc 5.2 13.1 inc 0.5 Time cfs cfs cfs .... , cfs cfs .ft cfs 21.5 0.0 0.00 298.05 307.82 4.88 301.3 36.0 22.0 0.0 0.00 288.33 298.05 4.86 301.2 35.0 22.5 0.0 0.00 278.66 288.33 4.84 301.2 34.0 23.0 0.0 0.00 269.03 278.66 4.82 301.2 33.0 23.5 0.0 0.00 259.44 269.03 4.79 301.1 32.0 24.0 0.0 0.00 249.89 259.44 4.77 301.1 31.0 24.5 0.0 0.00 240.39 249.89 4.75 301.1 30.0 25.0 0.0 0.00 230.93 240.39 4.73 301.0 29.0 25.5 0.0 0.00 221.54 230.93 4.70 301.0 27.9 26.0 0.0 0.00 212.23 221.54 4.65 300.9 26.9 26.5 0.0 0.00 203.01 212.23 4.61 300.9 25.9 27.0 0.0 0.00 193.87 203-.01 4.57 300.8 24.9 27.5 0.0 0.00 184.82 193.87 4.53 300.7 23.9 28.0 0.0 0.00 175.85 184.82 4.48 300.7 22.9 28.5 0.0 0.00 166.97 175.85 4.44 300.6 21.9 29.0 0.0 0.00 158.17 166.97 4.40 300.6 20.9 29.5 0.0 0.00 149.45 158.17 4.36 300.5 19.8 30.0 0.0 0.00 140.81 149.45 4.32 300.5 18.8 30.5 0.0 0.00 132.26 140.81 4.28 300.4 17.8 31.0 0.0 0.00 123.78 132.26 4.24 300.3 16.8 31.5 0.0 0.00 115.39 123.78 4.20 300.3 15.8 32.0 0.0 0.00 107.07 115.39 4.16 300.2 14.8 PEAK FLOWS 24.4 12.4 301.80 52.6 0. 00 indicates in ital condition c w UJ ..J 0 < '1. .... 0 0 ex: .... '1. cfs 40.92 39.89 38.85 37.82 36.78 35.75 34.71 33.68 32.64 31.58 30.53 29.47 28.42 27.36 26.31 25.25 24.20 23.15 22.09 21.04 19.99 18.94 60.4 (!) ..J ~ < .... .... UJ -oxw t-W ~ 9603-dra.xls Exhibit D cfs 41.03 39.88 38.72 37.57 36.41 35.26 34.11 32.95 31.80 30.64 29.49 28.33 27.18 26.03 24.87 23.72 22.56 21.41 20.26 19.10 17.95 16.79 60.0 EXH(BIT "D" PROPOSED DETENTION POND ROUTING Grand Oaks Subdivision DA# Pond Routing EVENT• 100 DA# "" c ~ a 0. + CIJ c -c ... ~ 0 e .... a 0 + I .... ;:; .... It) c -+ .... "O • J, "O ~ c + c ~ ~ + c-; >-(I) en c 0-::c .... c N N a 0. w N' Qp 28.2 59.7 Tc 5.2 13.1 Inc 0.5 Time cfs cfs cfs cfs cfs ft cfs 0.0 0.0 2.71 0.00 0.00 0.00 297.5 0.0 0.5 2.7 8.13 -1.04 2.71 1.87 298.1 2.3 1.0 5.4 13.55 2.47 7.09 2.31 298.4 4.6 1.5 8.1 18.97 9.82 16.02 3..10 299.0 6.8 2.0 10.8 24.39 22.22 28.79 3-28 299.2 9.1 2.5 13.5 29.81 39.53 46.61 3.54 299.5 11.4 3.0 16.3 35.23 61.63 69.34 3.86. 299.9 13.7 3.5 19.0 40.65 88.71 96.85 4.07 300.1 16.0 4.0 21.7 46.07 120.91 129.36 4....22 300.3 18.2 4.5 24.4 51.49 158.18 166.98 _4._4a 300.6 20.5 5.0 27.1 54.47 200.47 209.67 4_60 300.8 22.8 5.5 27.4 53.39 245.42. 254.94 __ 4.16-301.1 25.1 6.0 26.0. 50.68 289.08 298.80 4.86 301.2 27.4 6.5 24.7 47.97 329.85 339.76 4..95 301.4 29.6 7.0 23.3 45.26 367.73 377.82 5J)4 301.5 31.9 7.5 22.0 42.55 402.75 412.99 •· .5..j2. 301.6 34.2 8.0 20.6 39.84 434..S'\.. 445.30 5....19. 301.7 36.5 8.5 19.2 37.13 447.97 474.75 t3..39. 301.8 38.7 9.0 17.9 34.42 452.23 485.09 16A.3 301.8 41.0 9.5 16.5 31.71 452.87 486.65 16..89. 301.8 43.3 10.0 15.2 29.00 452.02 484.58 16.28 301.8 45.6 10.5 13.8 26.29 450.55 481.01 t5..23 301.8 47.9 11.0 12.5 23.58 448.83 476.84 14.00 301.8 50.1 11.5 11.1 20.87 447.00 472.40 12.70 301.8 52.4 12.0 9.8 18.16 445.13 467.87 11.37 301.8 54.7 12.5 8.4 15.45 443.24 463.29 10.02 301.8 57.0 13.0 7.0 12.74 441.35 458.69 8.67 301.8 59.3 13.5 5.7 10.03 439.45 454.09 7.32 301.8 58.8 14.0 4.3 7.32 437.55 449.48 5.96 301.8 57.7 14.5 3.0 4.61 434.48 444.87 5.19 301.7 56.5 15.0 1.6 1.90 428.73 439.09 5.18 301.7 55.4 15.5 0.3 0.27 420.31 430.63 5.16 301.7 54.2 16.0 0.0 0.00 410.30 420.58 5.14 301.7 53.1 16.5 0.0 0.00 400.07 410.30 5.11 301.6 52.0 17.0 0.0 0.00 389.89 400.07 5.09 301.6 50.8 17.5 0.0 0.00 379.76 389.89 5.07 301.5 49.7 18.0 0.0 0.00 369.66 379.76 5.05 301.5 48.5 18.5 0.0 0.00 359.62 369.66 5.02 301.5 47.4 19.0 0.0 0.00 349.62 359.62 5.00 301.4 46.3 19.5 0.0 0.00 339.67 349.62 4.98 301.4 45.1 20.0 0.0 0.00 329.76 339.67 4.95 301.4 44.0 20.5 0.0 0.00 319.89 329.76 4.93 301.3 42.8 21.0 0.0 0.00 310.08 319.89 4.91 301.3 41.7 0. 00 indicates in ital condition 0 w en ...J 0 <( 0. I-0 g g: cfs 0.00 4.15 6.87 9.94 12.40 14.93 17.53 20.03 22.46 24.91 27.39 29.83 32.21 34.58 36.95 39.31 41.66 52.14 57.46 60.19 61.86 63.10 64.15 65.12 66.07 67.00 67.93 66.12 63.63 61.72 60.56 59.41 58.24 57.08 55.92 54.75 53.59 52.43 51.27 50.10 48.94 47.78 46.62 C) ...J ~ <( I-i-en --w g >< .... w-9603-dra.xls Exhibit D cfs 0.00 2.60 5.20 7.80 10.39 12.99 15.59 18.19 20.79 23.39 25.99 28.59 31.18 33.78 36.38 38.98 41.58 44.18 46.78 49.38 51.97 54.57 57.17 59.77 62.37 64.97 67.57 66.98 65.68 64.38 63.08 61.78 60.48 59.18 57.88 56.59 55.29 53.99 52.69 51.39 50.09 48.79 47.49 EXHIBLl_"D" PROPOSED DETENTION POND ROUTING Grand Oaks Subdivision D.A. # Pond Routing EVENT .. 100 D.A. # 'It c &. a a. + .. c ... c ~ a "tJ 0 0 8' ... -;:: ... + I ... "tJ • I ~ II) c ... + ... co "tJ ~ + ~ c + c > >-"' "' c 0 .!! C') J: ... c N N a 0.. w N' Qp 28.2 59.7 Tc 5.2 13.1 Inc 0.5 Time cfs cfs cfs ·· cfs cfs ft cfs 21.5 0.0 0.00 300.30 310.08 4.89 ·301.3 40.6 22.0 0.0 0.00 290.57 300.30 4.87 301.2 39.4 22.5 0.0 0.00 280.89 290.57 4.84 301.2 38.3 23.0 0.0 0.00 271.24 280.89 4.82 301.2 37.2 23.5 0.0 0.00 261.65 271.24 4.80 301.1 36.0 24.0 0.0 0.00 252.09 261.65 4.78 301.1 34.9 24.5 0.0 0.00 242.58 252.09 4.76 301.1 33.7 25.0 0.0 0.00 233.11 242.58 4.73 301.0 32.6 25.5 0.0 0.00 223.69 233.11 4.71 301.0 31.5 26.0 0.0 0.00 214.36 223.69 4.66 300.9 30.3 26.5 0.0 0.00 205.12 214.36 4.62 300.9 29.2 27.0 0.0 0.00 . 195.97 205.12 4.58 300.8 28.0 27.5 0.0 0.00 186.90 195.97 4.54 300.8 26.9 28.0 0.0 0.00 177.91 186.90 4.49 300.7 25.8 28.5 0.0 0.00 169.01 177.91 4.45 300.6 24.6 29.0 0.0 0.00 160.19 169.01 4.41 300.6 23.5 29.5 0.0 0.00 151.45 160.19 4.37 300.5 22.3 30.0 0.0 0.00 142.80 151.45 4.33 300.5 21.2 30.5 0.0 0.00 134.22 142.80 4.29 300.4 20.1 31.0 0.0 0.00 125.73 134.22 4.25 300.4 18.9 31.5 0.0 0.00 117.31 125.73 421 300.3 17.8 32.0 0.0 0.00 108.98 117.31 4.17 300.2 16.6 PEAK FLOWS 27.4 16.9 301.83 59.3 0.00 indicates inital condition c w "' ..J 0 ct 0.. I-0 0 0:: I-0.. cfs 45.46 44.30 43.13 41.97 40.81 39.65 38.49 37.33 36.16 34.98 33.79 32.61 31.43 30.25 29.07 27.89 26.70 25.52 24.34 23.16 21.99 20.81 67.9 0 ..J ~ ct .... .... "' -0 >< w .... w :!:.. 9603-dra.xls Exhibit D cfs 46.19 44.89 43.59 42.29 40.99 39.69 38.39 37.10 35.80 34.50 33.20 31.90 30.60 29.30 28.00 26.70 25.40 24.10 22.80 21.50 20.20 18.90 67.6