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HomeMy WebLinkAboutDrainage Report GALINDO ENGINEERS AND PLANNERS, INC. 3833 South Texas Ave., Suite 213 Bryan, Texas 77802 (409) 846 -8868 September 14, 2000 Development Engineering Department City of College Station College Station, TX Subject: Drainage Report Silk Stocking Lounge College Station, TX Please find enclosed the referenced report for your review. This analysis covers the 0.651 acre (a portion of a total 2.236 -acre tract) that is affected by the development of the proposed parking lot for the existing Silk Stocking Lounge. Sincerely, GALINDO ENGINEERS AND PLANNERS, INC. / / Christian A. GALINDO, P.E., R.P.L.S. President cc: Jim Allen 1 SILK STOCKING LOUNGE DRAINAGE REPORT 20 -00 1. TRACT DESCRIPTION The Silk Stocking Lounge is located on 2.236 acres of land located on the northeast side of State Highway 6 (South Texas Avenue), just south of its intersection with Rock Prairie Road. This property is a 2.236 -acre tract or parcel of land, owned by Blue Dolphin Club, Inc., lying and being situated in the Robert Stevenson League, Abstract 54, Brazos County, Texas; A separate 24" x 36" sheet, titled Parking Lot Upgrading - Site Plan and Drainage Plan, is part of this report and is herein referred to as Exhibit 1. The adopted Flood Insurance Study does not identify the existence of a 100 -year flood plain affecting this tract (Map # 48041 C 0206 C, July 2, 1992). However, the rear portion of this property lies in the 100 -year flood plain according to a study performed by the City of College Station on the North Fork of Lick Creek. See Exhibit 1. 2. STORMWATER RUNOFF Exhibit 1 is also an overview of the project area obtained from data furnished by the developer of the project: boundary survey by Curtis Strong, R.P.L.S. # 4961 and topographic data by the City of College Station (1994), field verified herein. A site benchmark, elevation 283.80, was established at the easternmost building slab corner as shown on Exhibit 1. One drainage section, 0.651 acres, was identified for this project. It consists only of the area disturbed by the development of the proposed parking lot as shown on Exhibit 1. Exhibit 2 (1 page), shows the runoff calculations for the 5, 10, 25, 50 and 100 -year storms for this drainage section. 3. INFLOW HYDROGRAPHS Inflow hydrographs for the five storms, calculated using Haestad Quick -TR 55 Version 5.47, are shown in Exhibit 3 (6 pages) and give a preliminary storage requirement of 0.014 ac -ft for the 100 -yr rainfall. The resulting preliminary runoff detention for the 100 -year return period, using Haestad Pond -2 Version 5.21, is calculated at 0.01 ac -ft and is given in Exhibit 4 (2 pages). -1- 4. DETENTION FACILITY A detention facility has been designed at the northern corner of the proposed parking lot. This facility will release the runoff through a vertical - rectangular weir, a curb cut 3.33' wide and 0.7' high, which disperses the water into sheet flow towards the rear of the property by means of a 6' x 10' section of rubble rip -rap (20 lbs. pieces). The top of the pond was established at 282.40'. The weir flow line was set at 281.70'. Exhibit 5 (4 pages) shows the characteristics of the 3.33'x0.7' v -r weir. Exhibit 6 (1 page) shows the contour volumes for the pond elevations. Exhibit 7 (10 pages) shows the pond routing computations for multiple (five) storms. The results are summarized as follows: Storm 5 10 25 50 100 Qmax out allowed, cfs 3.83 4.30 4.91 5.55 5.80 Max Pond elev., ft 282.40 282.40 282.40 282.40 282.40 Peak flow attained, cfs 3.72 4.17 4.76 5.38 5.62 Pond elev. at peak flow, ft 282.22 282.26 282.31 282.37 282.38 � l Flow velocity (at Q -100) at the weir is calculated at3.. 8 fps. Since the weir is designed to discharge the water to the rear of the property, an area of 6' x 10' rip -rap will be installed below the weir to prevent erosion. 8. CERTIFICATION This report and design conform with the City of College Station Drainage Policy and Design Standards. i � * . ZLCIGS ]� G Gy Ili3 / CHRISTIAN A. GALINDO, P. . # 53425, R.P.L.S. # 4473 September 14, 2000 z. ;* fi,CHRISTiAN A, CAL..INDO � S : 2 5 1 • ,, , ` 4 . % • - 2 - F T'ti, �• `'• ties . c' .o. , s M ` EXHIBIT 2 4 .- (0 a0 (D CO a g to 0 IA (0 O (0 I 0 en tog N co 1 . 14) 1 (() R O to N O 1 o V N 7 A pp V I!'1 (7) N 1 n i N. 8 o v o v N O ( ri C N t L 3 p o I a0 (OA N N N i O O j (M O V' C O 1 U) O o i ((pp ` 1 0 M V W O V i (!) 1— 4 M O ei R O 14 d in I — 8% (0 (0 (0 (0 O .- r r v $ I § n § 4 W 4 co co _a 1 0 C .P.. O (0 W G g` I § n N N 0) 0) 0) 0) N 1 0) O 00 ( 4) 14 ) tt) 10 ° 8 1. $ co c2 2 O — 00 00 (p 6 N in t CO 0 CO 0 2 w M M el (") j Q (7 _1 4 ( (. (D (0 i. I I ` �5 r� g < - T N n n 1- < a Od o 6 z 1n + 'o i o i < a t 0 0 0 o n Lit 0) 0 O O o O iC T I O r 0 . CO o C N n O CO Z Z w E E I O D I- C ~ O Z o N N C R N C f0 0 0 co co 0 z< o u co g N o 6 O • p w m )n o )n o w O J C C r 01 c o d N D J 0 0 J 0 0 c(7) o U 0 0 O o g 0 0 m n (v (n r) 0) > 0 0 0 0 n Si 0) 0) o o 0 0 0 w in 0 ( N p d 1 co O ((( i N O I ((0 < 0 1 O O O O O , O < 1 I 1 I E 0 T 1 n a ""?-2 ~ 1 m .c '6 0 (i 0 1 E T m 0 o a c 0 N 0 1 o 0 1- 0 o 1 4 > d c D .d.. t 1 T r- N N N o o o ( i a a ° 1 1- ° . - 1 EXHIBIT 3 Quick TR -55 Ver.5.47 S /N: Executed: 14:38:12 09 -13 -2000 MODIFIED RATIONAL METHOD - - -- Graphical Summary for Maximum Required Storage - - -- SILK STOCKING LOUNGE *************************************** * * * * * * * * * * * * * * * * * * * * * * * * * * * * * ** * 1 * RETURN FREQUENCY: 5 yr 1 Allowable Outflow: 3.83 cfs * 'C' Adjustment: 1.000 1 Required Storage: 0.009 ac -ft * * 1 * * STORM DURATION = Tc for Max.Storage * * Peak Inflow: 4.51 cfs Inflow .HYD stored: 5IN .HYD * *************************************** * * * * * * * * * * * * * * * * * * * * * * * * * * * * * ** Tc= 10.00 minutes I = 7.693 in /hr Area (ac): 0.65 . Q = 4.51 cfs Weighted C: 0.90 .1. Adjusted C: 0.90 F . L . 1 . Required Storage O 0.009 ac -ft w I 1 • c 1 • f s o 0 o Q= 3.83 cfs o (Allow.Outflow) 0 o NOT TO SCALE . o 0 11.50 minutes Quick TR -55 Ver.5.47 S /N: Executed: 14:38:12 09 -13 -2000 MODIFIED RATIONAL METHOD - - -- Graphical Summary for Maximum Required Storage - - -- SILK STOCKING LOUNGE *************************************** * * * * * * * * * * * * * * * * * * * * * * * * * * * * * ** * 1 * * RETURN FREQUENCY: 10 yr 1 Allowable Outflow: 4.30 cfs * 'C' Adjustment: 1.000 1 Required Storage: 0.010 ac -ft * * 1 * * STORM DURATION = Tc for Max.Storage * * * Peak Inflow: 5.06 cfs Inflow .HYD stored: 10IN .HYD * *************************************** * * * * * * * * * * * * * * * * * * * * * * * * * * * * * ** Tc= 10.00 minutes I = 8.635 in /hr Area (ac): 0.65 . Q = 5.06 cfs Weighted C: 0.90 .1. Adjusted C: 0.90 F • L . 1 • Required Storage p 0.010 ac -ft w I• • c 1 • f• s o 0 o Q= 4.30 cfs o (Allow.Outflow) 0 o NOT TO SCALE . o 0 11.50 minutes Quick TR -55 Ver.5.47 S /N: Executed: 14:38:12 09 -13 -2000 MODIFIED RATIONAL METHOD - - -- Graphical Summary for Maximum Required Storage - - -- SILK STOCKING LOUNGE *************************************** * * * * * * * * * * * * * * * * * * * * * * * * * * * * * ** * 1 * * RETURN FREQUENCY: 25 yr 1 Allowable Outflow: 4.91 cfs * 'C' Adjustment: 1.000 I Required Storage: 0.012 ac -ft * * 1 * * STORM DURATION = Tc for Max.Storage * * Peak Inflow: 5.78 cfs Inflow .HYD stored: 25IN .HYD *************************************** * * * * * * * * * * * * * *, * * * * * * * * * * * * * * ** Tc= 10.00 minutes I = 9.861 in /hr Area (ac): 0.65 Q = 5.78 cfs Weighted C: 0.90 ,I, Adjusted C: 0.90 F L • 1 • Required Storage O 0.012 ac -ft w I I • • c 1 f s o o o Q= 4.91 cfs o (Allow.Outflow) • 0 o NOT TO SCALE • o 0 11.50 minutes ,Quick TR -55 Ver.5.47 S /N: Executed: 14:38:12 09 -13 -2000 MODIFIED RATIONAL METHOD - - -- Graphical Summary for Maximum Required Storage - - -- SILK STOCKING LOUNGE *************************************** * * * * * * * * * * * * * * * * * * * * * * * * * * * * * ** * I * * RETURN FREQUENCY: 50 yr 1 Allowable Outflow: 5.55 cfs * 'C' Adjustment: 1.000 1 Required Storage: 0.014 ac -ft * * 1 * STORM DURATION = Tc for Max.Storage * * Peak Inflow: 6.53 cfs Inflow .HYD stored: 50IN .HYD * *************************************** * * * * * * * * * * * * * * * * * * * * * * * * * * * * * ** Tc= 10.00 minutes I = 11.148 in /hr Area (ac): 0.65 . Q = 6.53 cfs Weighted C: 0.90 .1. Adjusted C: 0.90 F L . 1 . Required Storage O 0.014 ac -ft w 1. • I c 1 • f • s o 0 o Q= 5.55 cfs o (Allow.Outflow) • 0 o NOT TO SCALE . o 0 11.50 minutes Quick TR -55 Ver.5.47 S /N: Executed: 14:38:12 09 -13 -2000 MODIFIED RATIONAL METHOD - - -- Graphical Summary for Maximum Required Storage - - -- SILK STOCKING LOUNGE *************************************** * * * * * * * * * * * * * * * * * * * * * * * * * * * * * ** * 1 * * RETURN FREQUENCY: 100 yr ( Allowable Outflow: 5.80 cfs * 'C' Adjustment: 1.000 I Required Storage: 0.014 ac -ft * * I * * STORM DURATION = Tc for Max.Storage * * * Peak Inflow: 6.82 cfs Inflow .HYD stored: 100IN .HYD * *************************************** * * * * * * * * * * * * * * * * * * * * * * * * * * * * * ** Tc= 10.00 minutes I = 11.639 in /hr Area (ac): 0.65 . Q = 6.82 cfs Weighted C: 0.90 .1. Adjusted C: 0.90 F . L I . Required Storage O 0.014 ac -ft w I I . • c I • f • s o o o Q= 5.80 cfs o (Allow.Outflow) 0 o NOT TO SCALE . o 0 11.49 minutes Quick TR -55 Ver.5.47 S /N: Executed: 14:38:12 09 -13 -2000 ***************************************** * * * * * * * * * * * * * * * * * * * * * * * * * * * * * ** ***************************************** * * * * * * * * * * * * * * * * * * * * * * * * * * * * * ** * * * * * MODIFIED RATIONAL METHOD * * - - -- Grand Summary For All Storm Frequencies - - -- * * * * * ***************************************** * * * * * * * * * * * * * * * * * * * * * * * * * * * * * ** ***************************************** * * * * * * * * * * * * * * * * * * * * * * * * * * * * * ** First peak outflow point assumed to occur at Tc hydrograph recession leg. SILK STOCKING LOUNGE Area = 0.65 acres Tc = 10.00 minutes VOLUMES Frequency Adjusted Duration Intens. Qpeak Allowable Inflow Storage (years) 'C' minutes in /hr cfs cfs (ac -ft) (ac -ft) 5 0.900 10 7.693 4.51 3.83 0.062 0.009 10 0.900 10 8.635 5.06 4.30 0.070 0.010 25 0.900 10 9.861 5.78 4.91 0.080 0.012 50 0.900 10 11.148 6.53 5.55 0.090 0.014 100 0.900 10 11.639 6.82 5.80 0.094 0.014 EXHIBIT 4 POND -2 Version: 5.21 S /N: >>>>> OUTFLOW HYDROGRAPH ESTIMATOR ««< Inflow Hydrograph: d: \ljo \20- 00 \20- 00pnd \100IN .HYD Qpeak = 6.8 cfs Estimated Outflow: d: \ljo \20- 00 \20 -00pnd \ESTIMATE.EST Qpeak = 5.8 cfs Approximate Storage Volume (computed from t= 0.00 to 0.19 hrs) 0.0 acre -ft POND -2 Version: 5.21 S /N: Plotted: 09 -13 -2000 Flow (cfs) 0.0 1.0 2.0 3.0 4.0 5.0 6.0 7.0 8.0 9.0 10.0 11.0 0.0 - x x* .02 - x* x * . 03 - x x * .05 - x * x .07 - x * x * . 08 - x x * .1 - x x * .12 - x * x * .13 - x * x * .15 - x x .17 - x x .18 - x x .2 - * * .22 - * * .23 - .25 - .27 - .28 - .3 - * .32 - .33 - * TIME (hrs) * File: d: \ljo \20- 00 \20- 00pnd \100IN .HYD Qmax = 6.8 cfs x File: d: \ljo \20- 00 \20 -00pnd \ESTIMATE.EST Qmax = 5.8 cfs EXHIBIT 5 • Outlet Structure File: 20 -00 .STR POND -2 Version: 5.21 S /N: Date Executed: Time Executed: * * * * * * * * * * * * * * * * * * * ** SILK STOCKINGS LOUNGE * * * * * * * * * * * * * * * * * * * ** * * * ** Outlet Structure File: 20 -00 .STR POND -2 Version: 5.21 S /N: Date Executed: Time Executed: * * * * * * * * * * * * * * * * * * * ** SILK STOCKINGS LOUNGE * * * * * * * * * * * * * * * * * * * ** Outlet Structure File: d: \ljo \20- 00 \20- 00pnd \20 -00 .STR Planimeter Input File: d: \ljo \20- 00 \20- O0pnd \20 -00 .VOL Rating Table Output File: d: \ljo \20- 00 \20- 00pnd \20 -00 .PND Min. Elev.(ft) = 281.7 Max. Elev.(ft) = 282.4 Incr.(ft) = .2 Additional elevations (ft) to be included in table: * * * * * * * * * * * * * * * * * * * * * * * * * * *************** * * * * * * * * * * * * * * * * * * * * * * * * * * * * * ** SYSTEM CONNECTIVITY *************** * * * * * * * * * * * * * * * * * * * * * * * * * * * * * ** Structure No. Q Table Q Table WEIR -VR 1 -> 1 Outflow rating table summary was stored in file: d: \ljo \20- 00 \20- O0pnd \20 -00 .PND Outlet Structure File: 20 -00 .STR POND -2 Version: 5.21 S /N: Date Executed: Time Executed: * * * * * * * * * * * * * * * * * * * ** SILK STOCKINGS LOUNGE * * * * * * * * * * * * * * * * * * * ** >>>>>> Structure No. 1 <<<«< (Input Data) WEIR -VR Weir - Vertical Rectangular El elev.(ft)? 281.7 E2 elev.(ft)? 282.401 Weir coefficient? 3.087 Weir elev.(ft)? 281.70 Length (ft)? 3.33 Contracted /Suppressed (C /S)? C Outlet Structure File: 20 -00 .STR POND -2 Version: 5.21 S /N: Date Executed: Time Executed: * * * * * * * * * * * * * * * * * * * ** SILK STOCKINGS LOUNGE * * * * * * * * * * * * * * * * * * * ** Outflow Rating Table for Structure #1 WEIR -VR Weir - Vertical Rectangular * * * ** INLET CONTROL ASSUMED * * * ** Elevation (ft) Q (cfs) Computation Messages 281.70 0.0 H =0.0 281.90 0.9 H =.2 282.10 2.5 H =.4 282.30 4.6 H =.6 282.40 5.8 H =.7 C = 3.087 L (ft) = 3.33 H (ft) = Table elev. - Invert elev. ( 281.7 ft ) Q (cfs) = C * (L -.2H) * (H * *1.5) -- Contracted Weir EXHIBIT 6 % POND -2 Version: 5.21 S /N: SILK STOCKING LOUNGE CALCULATED 09 -13 -2000 14:40:58 DISK FILE: d: \ljo \20- 00 \20- 00pnd \20 - 00 .VOL Planimeter scale: 1 inch = 1 ft. * Elevation Planimeter Area Al +A2 +sgr(A1 *A2) Volume Volume Sum (ft) (sq.in.) (acres) (acres) (acre -ft) (acre -ft) 281.70 0.00 0.00 0.00 0.00 0.00 281.90 1,000.00 0.02 0.02 0.00 0.00 282.10 1,483.00 0.03 0.08 0.01 0.01 282.40 1,995.00 0.05 0.12 0.01 0.02 2 IA = ( sq.rt(Areal) + ( (Ei- E1) /(E2- E1)) *(sq.rt(Area2)- sq.rt(Areal))) where: El, E2 = Closest two elevations with planimeter data Ei = Elevation at which to interpolate area Areal,Area2 = Areas computed for El, E2, respectively IA = Interpolated area for Ei * Incremental volume computed by the Conic Method for Reservoir Volumes. Volume = (1/3) * (EL2 -EL1) * (Areal + Area2 + sq.rt.(Areal *Area2)) where: EL1, EL2 = Lower and upper elevations of the increment Areal,Area2 = Areas computed for EL1, EL2, respectively Volume = Incremental volume between EL1 and EL2 EXHIBIT 7 POND -2 Version: 5.21 S /N: Page 1 EXECUTED: 09 -13 -2000 14:41:46 STORM # 1 Return Freq: 5 years * * * * * * * * * * * * * * * * * * * * * * * * * ** * * SILK STOCKING LOUNGE * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * ** * * * * * * * * * * * * * * * * ** SUMMARY OF ROUTING COMPUTATIONS * * * * * * * * * * * * * * * * ** Pond File: d: \ljo \20- 00 \20 00pnd \20 - 00 .PND Inflow Hydrograph: d: \ljo \20- 00 \20 00pnd \5IN .HYD Outflow Hydrograph: d: \ljo \20- 00 \20 00pnd \5 OUT .HYD Starting Pond W.S. Elevation = 281.70 ft * * * ** Summary of Peak Outflow and Peak Elevation * * * ** Peak Inflow = 4.51 cfs Peak Outflow = 3.72 cfs Peak Elevation = 282.22 ft * * * ** Summary of Approximate Peak Storage * * * ** Initial Storage = 0.00 ac -ft Peak Storage From Storm = 0.01 ac -ft Total Storage in Pond = 0.01 ac -ft POND -2 Version: 5.21 S /N: Page 3 STORM # 1 Return Freq: 5 years Pond File: d: \ljo \20- 00 \20- 00pnd \20 -00 .PND Inflow Hydrograph: d: \ljo \20- 00 \20 -00pnd \5IN .HYD Outflow Hydrograph: d: \ljo \20- 00 \20- 00pnd \5 OUT .HYD EXECUTED: 09 -13 -2000 Peak Inflow = 4.51 cfs 14:41:46 Peak Outflow = 3.72 cfs Peak Elevation = 282.22 ft Flow (cfs) 0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 I I I I 1 1 1 1 I I 0.0 - * x .02 - x * X * .03 - x x .05 - x x .07 - x x .09 - x x .1 - x .12 - x x .14 - x X .15 - x X .17 - X * .19 - x * x* .2 - * x * x .22 - * x * x .24 - * x * X .26 - * x * X .27 - * x * x .29 - x * x .31 - * x * x .32 - * x * x TIME (hrs) x File: d: \ljo \20- 00 \20- 00pnd \5 OUT .HYD Qmax = 3.7 cfs * File: d: \ljo \20- 00 \20 -O0pnd \5IN .HYD Qmax = 4.5 cfs POND -2 Version: 5.21 S /N: Page 1 EXECUTED: 09 -13 -2000 14:41:46 STORM # 2 Return Freq: 10 years * * * * * * * * * * * * * * * * * * * * * * * * * ** * * * SILK STOCKING LOUNGE * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * ** * * * * * * * * * * * * * * * * ** SUMMARY OF ROUTING COMPUTATIONS * * * * * * * * * * * * * * * * ** Pond File: d: \ljo \20- 00 \20- 00pnd \20 -00 .PND Inflow Hydrograph: d: \ljo \20- 00 \20- 00pnd \10IN .HYD Outflow Hydrograph: d: \ljo \20- 00 \20- O0pnd \10 OUT .HYD Starting Pond W.S. Elevation = 281.70 ft * * * ** Summary of Peak Outflow and Peak Elevation * * * ** Peak Inflow = 5.06 cfs Peak Outflow = 4.17 cfs Peak Elevation = 282.26 ft * * * ** Summary of Approximate Peak Storage * * * ** Initial Storage = 0.00 ac -ft Peak Storage From Storm = 0.01 ac -ft Total Storage in Pond = 0.01 ac -ft POND -2 Version: 5.21 S /N: Page 3 STORM # 2 Return Freq: 10 years Pond File: d: \ljo \20- 00 \20- 00pnd \20 -00 .PND Inflow Hydrograph: d: \ljo \20- 00 \20- 00pnd \10IN .HYD Outflow Hydrograph: d: \ljo \20- 00 \20- 00pnd \10 OUT .HYD EXECUTED: 09 -13 -2000 Peak Inflow = 5.06 cfs 14:41:46 Peak Outflow = 4.17 cfs Peak Elevation = 282.26 ft Flow (cfs) 0.0 1.0 2.0 3.0 4.0 5.0 6.0 7.0 8.0 9.0 10.0 11.0 0.0 - * x .02 - x * x .03 - x * x * .05 - x X * .07 - x * X * .09 - x * X * .1 - x * X * .12 - x * X * .14 - x * X * .15 - x * X * .17 - x * x * .19 - x * .2 - *x * x .22 - * x * X .24 - * x * X .26 - * x * X .27 - * x * X .29 - * x * X .31 - * x * x .32 - * * x TIME (hrs) x File: d: \ljo \20- 00 \20- 00pnd \10 OUT .HYD Qmax = 4.2 cfs * File: d: \ljo \20- 00 \20- 00pnd \10IN .HYD Qmax = 5.1 cfs POND -2 Version: 5.21 S /N: Page 1 EXECUTED: 09 -13 -2000 14:41:46 STORM # 3 Return Freq: 25 years * * * * * * * * * * * * * * * * * * * * * * * * * ** * * SILK STOCKING LOUNGE * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * ** * * * * * * * * * * * * * * * * ** SUMMARY OF ROUTING COMPUTATIONS * * * * * * * * * * * * * * * * ** Pond File: d: \ljo \20- 00 \20- 00pnd \20 -00 .PND Inflow Hydrograph: d: \ljo \20- 00 \20- 00pnd \25IN .HYD Outflow Hydrograph: d: \ljo \20- 00 \20- 00pnd \25 OUT .HYD Starting Pond W.S. Elevation = 281.70 ft * * * ** Summary of Peak Outflow and Peak Elevation * * * ** Peak Inflow = 5.78 cfs Peak Outflow = 4.76 cfs Peak Elevation = 282.31 ft * * * ** Summary of Approximate Peak Storage * * * ** Initial Storage = 0.00 ac -ft Peak Storage From Storm = 0.02 ac -ft Total Storage in Pond = 0.02 ac -ft POND -2 Version: 5.21 S /N: Page 3 STORM # 3 Return Freq: 25 years Pond File: d: \ljo \20- 00 \20- O0pnd \20 -00 .PND Inflow Hydrograph: d: \ljo \20- 00 \20 -00pnd \25IN .HYD Outflow Hydrograph: d: \ljo \20- 00 \20- 00pnd \25 OUT .HYD EXECUTED: 09 -13 -2000 Peak Inflow = 5.78 cfs 14:41:46 Peak Outflow = 4.76 cfs Peak Elevation = 282.31 ft Flow (cfs) 0.0 1.0 2.0 3.0 4.0 5.0 6.0 7.0 8.0 9.0 10.0 11.0 0.0 - * x* .02 - x * x * .03 - x * x * .05 - x X * .07 - x * X * .09 - x * X * .1 - x * X * .12 - x * X * .14 - x * X * .15 - x x .17 - x x .19 - x x* .2 - * x * x .22 - x * x .24 - * x * x .26 - * x * X .27 - * x * X .29 - * x * x .31 - * x * x .32 - * x * X TIME (hrs) x File: d: \ljo \20- 00 \20- 00pnd \25 OUT .HYD Qmax = 4.8 cfs * File: d: \ljo \20- 00 \20 -00pnd \25IN .HYD Qmax = 5.8 cfs . , POND -2 Version: 5.21 S /N: Page 1 EXECUTED: 09 -13 -2000 17:22:51 STORM # 4 Return Freq: 50 years * * * * * * * * * * * * * * * * * * * * * * * * * ** * * * SILK STOCKING LOUNGE * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * ** * * * * * * * * * * * * * * * * ** SUMMARY OF ROUTING COMPUTATIONS * * * * * * * * * * * * * * * * ** Pond File: c: \ljo \20- 00 \20- 00pnd \20 - 00 .PND Inflow Hydrograph: c: \ljo \20- 00 \20- 00pnd \50IN .HYD Outflow Hydrograph: c: \ljo \20- 00 \20- 00pnd \50 OUT .HYD Starting Pond W.S. Elevation = 281.70 ft * * * ** Summary of Peak Outflow and Peak Elevation * * * ** Peak Inflow = 6.53 cfs Peak Outflow = 5.38 cfs Peak Elevation = 282.37 ft * * * ** Summary of Approximate Peak Storage * * * ** Initial Storage = 0.00 ac -ft Peak Storage From Storm = 0.02 ac -ft Total Storage in Pond = 0.02 ac -ft POND -2 Version: 5.21 S /N: Page 3 STORM # 4 Return Freq: 50 years Pond File: c: \ljo \20- 00 \20- 00pnd \20 -00 .PND Inflow Hydrograph: c: \ljo \20- 00 \20- 00pnd \50IN .HYD Outflow Hydrograph: c: \ljo \20- 00 \20- 00pnd \50 OUT .HYD EXECUTED: 09 -13 -2000 Peak Inflow = 6.53 cfs 17:22:51 Peak Outflow = 5.38 cfs Peak Elevation = 282.37 ft Flow (cfs) 0.0 1.0 2.0 3.0 4.0 5.0 6.0 7.0 8.0 9.0 10.0 11.0 • I I I I I I I I I I 0.0 - * x* .02 - x * X * .03 - x * X * .05 - x x .07 - x * X * .09 - x * X * .1 - x * X * .12 - x * X * .14 - x x .15 - x x .17 - x x * .19 - x * .2 - * x * x .22 - * x * X .24 - * x * X .26 - * x * X .27 - * x * x .29 - * x * x .31 - * x * X .32 - * * x TIME (hrs) x File: c: \ljo \20- 00 \20- 00pnd \50 OUT .HYD Qmax = 5.4 cfs * File: c: \ljo \20- 00 \20- 00pnd \50IN .HYD Qmax = 6.5 cfs POND -2 Version: 5.21 S /N: Page 1 EXECUTED: 09 -13 -2000 17:22:51 STORM # 5 Return Freq: 100 years * * * * * * * * * * * * * * * * * * * * * * * * * ** * * SILK STOCKING LOUNGE * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * ** * * * * * * * * * * * * * * * * ** SUMMARY OF ROUTING COMPUTATIONS * * * * * * * * * * * * * * * * ** Pond File: c: \ljo \20- 00 \20- 00pnd \20 - 00 .PND Inflow Hydrograph: c: \ljo \20- 00 \20- 00pnd \100IN .HYD Outflow Hydrograph: c: \ljo \20- 00 \20 - 00pnd \100 OUT .HYD Starting Pond W.S. Elevation = 281.70 ft * * * ** Summary of Peak Outflow and Peak Elevation * * * ** Peak Inflow = 6.82 cfs Peak Outflow = 5.62 cfs Peak Elevation = 282.38 ft * * * ** Summary of Approximate Peak Storage * * * ** Initial Storage = 0.00 ac -ft Peak Storage From Storm = 0.02 ac -ft Total Storage in Pond = 0.02 ac -ft POND -2 Version: 5.21 S /N: Page 3 STORM # 5 Return Freq: 100 years Pond File: c: \ljo \20- 00 \20- O0pnd \20 -00 .PND Inflow Hydrograph: c: \ljo \20- 00 \20- O0pnd \100IN .HYD Outflow Hydrograph: c: \ljo \20- 00 \20 -00pnd \100 OUT .HYD EXECUTED: 09 -13 -2000 Peak Inflow = 6.82 cfs 17:22:51 Peak Outflow = 5.62 cfs Peak Elevation = 282.38 ft Flow (cfs) 0.0 1.0 2.0 3.0 4.0 5.0 6.0 7.0 8.0 9.0 10.0 11.0 I I I I I I I I I I 0.0 - * x* .02 - x * X * .03 - x * X * .05 - x x .07 - x * X * .09 - x * X * .1 - x X * .12 - x * X * .14 - x * X * .15 - x * X * .17 - x * X * .19 - x * X* .2 - * x * x .22 - * x * x .24 - x * x .26 - * x * x .27 - * x * x .29 - * x * x .31 - * x * x .32 - * x * x TIME (hrs) x File: c: \ljo \20- 00 \20 -00pnd \100 OUT .HYD Qmax = 5.6 cfs * File: c: \ljo \20- 00 \20- 00pnd \100IN .HYD Qmax = 6.8 cfs r , SILK STOCKING LOUNGE DRAINAGE REPORT 20 -00 1. TRACT DESCRIPTION The Silk Stocking Lounge is located on 2.236 acres of land located on the northeast side of State Highway 6 (South Texas Avenue), just south of its intersection with Rock Prairie Road. This property is a 2.236 -acre tract or parcel of land, owned by Blue Dolphin Club, Inc., lying and being situated in the Robert Stevenson League, Abstract 54, Brazos County, Texas; A separate 24" x 36" sheet, titled Parking Lot Upgrading - Site Plan and Drainage Plan, is part of this report and is herein referred to as Exhibit 1. The adopted Flood Insurance Study does not identify the existence of a 100 -year flood plain affecting this tract (Map # 48041 C 0206 C, July 2, 1992). However, the rear portion of this property lies in the 100 -year flood plain according to a study performed by the City of College Station on the North Fork of Lick Creek. See Exhibit 1. 2. STORMWATER RUNOFF Exhibit 1 is also an overview of the project area obtained from data furnished by the developer of the project: boundary survey by Curtis Strong, R.P.L.S. # 4961 and topographic data by the City of College Station (1994), field verified herein. A site benchmark, elevation 283.80, was established at the easternmost building slab corner as shown on Exhibit 1. One drainage section, 0.651 acres, was identified for this project. It consists only of the area disturbed by the development of the proposed parking lot as shown on Exhibit 1. Exhibit 2 (1 page), shows the runoff calculations for the 5, 10, 25, 50 and 100 -year storms for this drainage section. 3. INFLOW HYDROGRAPHS Inflow hydrographs for the five storms, calculated using Haestad Quick -TR 55 Version 5.47, are shown in Exhibit 3 (6 pages) and give a preliminary storage requirement of 0.014 ac -ft for the 100 -yr rainfall. The resulting preliminary runoff detention for the 100 -year return period, using Haestad Pond -2 Version 5.21, is calculated at 0.01 ac -ft and is given in Exhibit 4 (2 pages). -1 - f ! 4. DETENTION FACILITY A detention facility has been designed at the northern corner of the proposed parking lot. This facility will release the runoff through a vertical - rectangular weir, a curb cut 3.33' wide and 0.7' high, which disperses the water into sheet flow towards the rear of the property by means of a 6' x 10' section of rubble rip -rap (20 lbs. pieces). The top of the pond was established at 282.40'. The weir flow line was set at 281.70'. Exhibit 5 (4 pages) shows the characteristics of the 3.33'x0.7' v -r weir. Exhibit 6 (1 page) shows the contour volumes for the pond elevations. Exhibit 7 (10 pages) shows the pond routing computations for multiple (five) storms. The results are summarized as follows: Storm 5 10 25 50 100 Qmax out allowed, cfs 3.83 4.30 4.91 5.55 5.80 Max Pond elev., ft 282.40 282.40 282.40 282.40 282.40 Peak flow attained, cfs 3.72 4.17 4.76 5.38 5.62 Pond elev. at peak flow, ft 282.22 282.26 282.31 282.37 282.38 .4/ Flow velocity (at Q -100) at the weir is calculated at,.338"fps. Since the weir is designed to discharge the water to the rear of the property, an area of 6' x 10' rip -rap will be installed below the weir to prevent erosion. 8. CERTIFICATION This report and design conform with the City of College Station Drainage Policy and Design Standards. ,/ ,./34-7C / p ' CHRISTIAN A. GALINDO, P. . # 53425, R.P.L.S. # 4473 September 14, 2000 * '; e; j l ? m EXHIBIT 2 NCO 1- (OlCO a g. 60 I Ili (00 ca 8 2 � 0 112 • a a K O Iri to C (0 • to O M US O) N N + co 1p a E 4 O of Cr) O to 0 N 3 E 0 ttO 0 co l t o i 0 0 0 a > M O v v 0 N O 0 ! I u o M? 1 CO CO V 1 () I- F2 M O ri O I 1 t a o E E ( ( O O r r .- . cc� 7 v v > I 25 V) ° O W O 00 k E § In O _ > . co co ( 10 ' E r.- co N 0) O) 0) a) N i 0 O 0 E N In N to o v o ( M 0 C C) CO N CO M O n N 0 — Co 00 C0 CO N 1 ai O 00 S I- LL 00)) 0)) 0) 0) O CD N 0) j. (0 co (0 CO Q — >` h n I• n < O 0 0 CO O v F- ce o 0 0 0 1 $ o W Q y O o 0 o id >, o n u) Z Z W •E = E to ! (0 0 00 N. O D H c F w O Z ° N N0°. NC (0 0 g (n O N c • o co 0 o 0 0 Z Q N 0 0 Y j N I O O (O Q Y 0 CO [O w LL W Y U t n ° v .- v C O U c �) a= M c'' i 1 a a) v D J NC 0 O J 0 O CC to U U U U (i $0 °o,o a) a is.) ( i co c+) > n 0) 0) 0) U 0 0 0 0 CO 1() II CO N 0 CO CO in Q U O 0 0 !! O 0 E O I a) Y ° o ( > N n c CL a 1 1 E ° (a E o ° 0 1 N o 0 0 ce H N U o! E 1 0 1 0 >a, t r 1 1 ,- N ti .- N I o I I -°) 0 i W 1 a a , ! t ° - EXHIBIT 3 Quick TR -55 Ver.5.47 S /N: Executed: 14:38:12 09 -13 -2000 MODIFIED RATIONAL METHOD - - -- Graphical Summary for Maximum Required Storage - - -- SILK STOCKING LOUNGE *************************************** * * * * * * * * * * * * * * * * * * * * * * * * * * * * * ** * 1 * RETURN FREQUENCY: 5 yr 1 Allowable Outflow: 3.83 cfs * 'C' Adjustment: 1.000 1 Required Storage: 0.009 ac -ft * * 1 * STORM DURATION = Tc for Max.Storage * * * Peak Inflow: 4.51 cfs Inflow .HYD stored: 5IN .HYD * *************************************** * * * * * * * * * * * * * * * * * * * * * * * * * * * * * ** Tc= 10.00 minutes I = 7.693 in /hr Area (ac): 0.65 . Q = 4.51 cfs Weighted C: 0.90 .1. Adjusted C: 0.90 F . L • 1 • Required Storage 0 0.009 ac -ft w • I 1 • c 1 . f s o 0 o Q= 3.83 cfs o (Allow.Outflow) 0 o NOT TO SCALE . o 0 11.50 minutes Quick TR -55 Ver.5.47 S /N: Executed: 14:38:12 09 -13 -2000 MODIFIED RATIONAL METHOD - - -- Graphical Summary for Maximum Required Storage - - -- SILK STOCKING LOUNGE *************************************** * * * * * * * * * * * * * * * * * * * * * * * * * * * * * ** * 1 * * RETURN FREQUENCY: 10 yr 1 Allowable Outflow: 4.30 cfs * 'C' Adjustment: 1.000 1 Required Storage: 0.010 ac -ft * * 1 * STORM DURATION = Tc for Max.Storage * * * Peak Inflow: 5.06 cfs Inflow .HYD stored: 10IN .HYD *************************************** * * * * * * * * * * * * * * * * * * * * * * * * * * * * * ** Tc= 10.00 minutes I = 8.635 in /hr Area (ac): 0.65 . Q = 5.06 cfs Weighted C: 0.90 .1. Adjusted C: 0.90 F . L • 1 • Required Storage O 0.010 ac -ft W 1• 1 . c 1 . f• s o 0 o Q= 4.30 cfs o (Allow.0utflow) 0 o NOT TO SCALE . o 0 11.50 minutes Quick TR -55 Ver.5.47 S /N: Executed: 14:38:12 09 -13 -2000 MODIFIED RATIONAL METHOD - - -- Graphical Summary for Maximum Required Storage - - -- SILK STOCKING LOUNGE * 1 * * RETURN FREQUENCY: 25 yr 1 Allowable Outflow: 4.91 cfs * 'C' Adjustment: 1.000 1 Required Storage: 0.012 ac -ft * * 1 * * STORM DURATION = Tc for Max.Storage * * Peak Inflow: 5.78 cfs Inflow .HYD stored: 25IN .HYD * ************,*************************** * * * * * * * * * * * * * *4.* * * * * * * * * * * * * * ** Tc= 10.00 minutes I = 9.861 in /hr Area (ac): 0.65 • Q = 5.78 cfs Weighted C: 0.90 .1. Adjusted C: 0.90 F . L • 1 • Required Storage O 0.012 ac -ft • w I• 1 c 1 • f s o 0 o Q= 4.91 cfs o (Allow.Outflow) • o o NOT TO SCALE . o 0 11.50 minutes Quick TR -55 Ver.5.47 S /N: Executed: 14:38:12 09 -13 -2000 MODIFIED RATIONAL METHOD - - -- Graphical Summary for Maximum Required Storage - - -- SILK STOCKING LOUNGE *************************************** * * * * * * * * * * * * * * * * * * * * * * * * * * * * * ** * 1 * RETURN FREQUENCY: 50 yr 1 Allowable Outflow: 5.55 cfs * 'C' Adjustment: 1.000 1 Required Storage: 0.014 ac -ft * * 1 * STORM DURATION = Tc for Max.Storage * * * Peak Inflow: 6.53 cfs Inflow .HYD stored: 50IN .HYD * *************************************** * * * * * * * * * * * * * * * * * * * * * * * * * * * * * ** Tc= 10.00 minutes I = 11.148 in /hr Area (ac): 0.65 . Q = 6.53 cfs Weighted C: 0.90 .1. Adjusted C: 0.90 F . L . 1 . Required Storage O 0.014 ac -ft w 1. 1 . c 1 . f s o 0 o Q= 5.55 cfs o (Allow.Outflow) 0 o NOT TO SCALE . o 0 11.50 minutes Quick TR -55 Ver.5.47 S /N: Executed: 14:38:12 09 -13 -2000 MODIFIED RATIONAL METHOD - - -- Graphical Summary for Maximum Required Storage - - -- SILK STOCKING LOUNGE *************************************** * * * * * * * * * * * * * * * * * * * * * * * * * * * * * ** * 1 * * RETURN FREQUENCY: 100 yr 1 Allowable Outflow: 5.80 cfs * 'C' Adjustment: 1.000 I Required Storage: 0.014 ac -ft * 1 * * STORM DURATION = Tc for Max.Storage * * Peak Inflow: 6.82 cfs Inflow .HYD stored: 100IN .HYD * *************************************** * * * * * * * * * * * * * * * * * * * * * * * * * * * * * ** Tc= 10.00 minutes I = 11.639 in /hr Area (ac): 0.65 . Q = 6.82 cfs Weighted C: 0.90 .1. Adjusted C: 0.90 F L • 1 . Required Storage 0 0.014 ac -ft w • 1 • • c I • f • s o 0 o Q= 5.80 cfs 0 (Allow.Outflow) 0 0 NOT TO SCALE . o 0 11.49 minutes Quick TR -55 Ver.5.47 S /N: Executed: 14:38:12 09 -13 -2000 ***************************************** * * * * * * * * * * * * * * * * * * * * * * * * * * * * * ** ***************************************** * * * * * * * * * * * * * * * * * * * * * * * * * * * * * ** * * * * * MODIFIED RATIONAL METHOD * * - - -- Grand Summary For All Storm Frequencies - - -- * * * * * ***************************************** * * * * * * * * * * * * * * * * * * * * * * * * * * * * * ** ***************************************** * * * * * * * * * * * * * * * * * * * * * * * * * * * * * ** First peak outflow point assumed to occur at Tc hydrograph recession leg. SILK STOCKING LOUNGE Area = 0.65 acres Tc = 10.00 minutes VOLUMES Frequency Adjusted Duration Intens. Qpeak Allowable Inflow Storage (years) 'C' minutes in /hr cfs cfs (ac -ft) (ac -ft) 5 0.900 10 7.693 4.51 3.83 0.062 0.009 10 0.900 10 8.635 5.06 4.30 0.070 0.010 25 0.900 10 9.861 5.78 4.91 0.080 0.012 50 0.900 10 11.148 6.53 5.55 0.090 0.014 100 0.900 10 11.639 6.82 5.80 0.094 0.014 EXHIBIT 4 POND -2 Version: 5.21 S /N: >>>>> OUTFLOW HYDROGRAPH ESTIMATOR <<<<< Inflow Hydrograph: d: \ljo \20- 00 \20- 00pnd \100IN .HYD Qpeak = 6.8 cfs Estimated Outflow: d: \ljo \20- 00 \20 -00pnd \ESTIMATE.EST Qpeak = 5.8 cfs Approximate Storage Volume (computed from t= 0.00 to 0.19 hrs) 0.0 acre -ft POND -2 Version: 5.21 S /N: Plotted: 09 -13 -2000 Flow (cfs) 0.0 1.0 2.0 3.0 4.0 5.0 6.0 7.0 8.0 9.0 10.0 11.0 • I I I I I I I I I I 0.0 - x x* .02 - x* x .03 - x x .05 - x * x * .07 - x x * .08 - x * x * .1 - x * x * .12 - x x * .13 - x x * .15 - x x .17 - x * x .18 - x * x .2 - * * .22 - * * .23 - .25 - * * .27 - .28 - .3 - .32 - .33 - * TIME (hrs) * File: d: \ljo \20- 00 \20- 00pnd \100IN .HYD Qmax = 6.8 cfs x File: d: \ljo \20- 00 \20 -00pnd \ESTIMATE.EST Qmax = 5.8 cfs EXHIBIT 5 Outlet Structure File: 20 -00 .STR POND -2 Version: 5.21 S /N: Date Executed: Time Executed: * * * * * * * * * * * * * * * * * * * ** SILK STOCKINGS LOUNGE * * * * * * * * * * * * * * * * * * * ** Outlet Structure File: d: \ljo \20- 00 \20- 00pnd \20 -00 .STR Planimeter Input File: d: \ljo \20- 00 \20- 00pnd \20 -00 .VOL Rating Table Output File: d: \ljo \20- 00 \20- 00pnd \20 -00 .PND Min. Elev.(ft) = 281.7 Max. Elev.(ft) = 282.4 Incr.(ft) = .2 Additional elevations (ft) to be included in table: * * * * * * * * * * * * * * * * * * * * * * * * * * *************** * * * * * * * * * * * * * * * * * * * * * * * * * * * * * ** SYSTEM CONNECTIVITY *************** * * * * * * * * * * * * * * * * * * * * * * * * * * * * * ** Structure No. Q Table Q Table WEIR -VR 1 -> 1 Outflow rating table summary was stored in file: d: \ljo \20- 00 \20- 00pnd \20 -00 .PND Outlet Structure File: 20 -00 .STR POND -2 Version: 5.21 S /N: Date Executed: Time Executed: * * * * * * * * * * * * * * * * * * * ** SILK STOCKINGS LOUNGE * * * * * * * * * * * * * * * * * * * ** >>>>>> Structure No. 1 <<<<<< (Input Data) WEIR -VR Weir - Vertical Rectangular El elev.(ft)? 281.7 E2 elev.(ft)? 282.401 Weir coefficient? 3.087 Weir elev.(ft)? 281.70 Length (ft)? 3.33 Contracted /Suppressed (C /S)? C Outlet Structure File: 20 -00 .STR POND -2 Version: 5.21 S /N: Date Executed: Time Executed: * * * * * * * * * * * * * * * * * * * ** SILK STOCKINGS LOUNGE * * * * * * * * * * * * * * * * * * * ** Outflow Rating Table for Structure #1 WEIR -VR Weir - Vertical Rectangular * * * ** INLET CONTROL ASSUMED * * * ** Elevation (ft) Q (cfs) Computation Messages 281.70 0.0 H =0.0 281.90 0.9 H =.2 282.10 2.5 H =.4 282.30 4.6 H =.6 282.40 5.8 H =.7 C = 3.087 L (ft) = 3.33 H (ft) = Table elev. - Invert elev. ( 281.7 ft ) Q (cfs) = C * (L -.2H) * (H * *1.5) -- Contracted Weir EXHIBIT 6 POND -2 Version: 5.21 S /N: SILK STOCKING LOUNGE CALCULATED 09 -13 -2000 14:40:58 DISK FILE: d: \ljo \20- 00 \20 00pnd \20 - 00 .VOL Planimeter scale: 1 inch = 1 ft. * Elevation Planimeter Area Al +A2 +sgr(A1 *A2) Volume Volume Sum (ft) (sq.in.) (acres) (acres) (acre -ft) (acre -ft) 281.70 0.00 0.00 0.00 0.00 0.00 281.90 1,000.00 0.02 0.02 0.00 0.00 282.10 1,483.00 0.03 0.08 0.01 0.01 282.40 1,995.00 0.05 0.12 0.01 0.02 2 IA = (sq.rt(Areal) + (( Ei- E1)/( E2- E1 )) *(sq.rt(Area2) sq.rt(Areal))) where: El, E2 = Closest two elevations with planimeter data Ei = Elevation at which to interpolate area Areal,Area2 = Areas computed for El, E2, respectively IA = Interpolated area for Ei * Incremental volume computed by the Conic Method for Reservoir Volumes. Volume = (1/3) * (EL2 -EL1) * (Areal + Area2 + sq.rt.(Areal *Area2)) where: EL1, EL2 = Lower and upper elevations of the increment Areal,Area2 = Areas computed for EL1, EL2, respectively Volume = Incremental volume between EL1 and EL2 EXHIBIT 7 POND -2 Version: 5.21 S /N: Page 1 EXECUTED: 09 -13 -2000 14:41:46 STORM # 1 Return Freq: 5 years * * * * * * * * * * * * * * * * * * * * * * * * * ** * * SILK STOCKING LOUNGE * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * ** * * * * * * * * * * * * * * * * ** SUMMARY OF ROUTING COMPUTATIONS * * * * * * * * * * * * * * * * ** Pond File: d: \ljo \20- 00 \20 00pnd \20 - 00 .PND Inflow Hydrograph: d: \ljo \20- 00 \20- 00pnd \5IN .HYD Outflow Hydrograph: d: \ljo \20- 00 \20 00pnd \5 OUT .HYD Starting Pond W.S. Elevation = 281.70 ft * * * ** Summary of Peak Outflow and Peak Elevation * * * ** Peak Inflow = 4.51 cfs Peak Outflow = 3.72 cfs Peak Elevation = 282.22 ft * * * ** Summary of Approximate Peak Storage * * * ** Initial Storage = 0.00 ac -ft Peak Storage From Storm = 0.01 ac -ft Total Storage in Pond = 0.01 ac -ft POND -2 Version: 5.21 S /N: Page 3 STORM # 1 Return Freq: 5 years Pond File: d: \ljo \20- 00 \20- 00pnd \20 -00 .PND Inflow Hydrograph: d: \ljo \20- 00 \20 -00pnd \5IN .HYD Outflow Hydrograph: d: \ljo \20- 00 \20- 00pnd \5 OUT .HYD EXECUTED: 09 -13 -2000 Peak Inflow = 4.51 cfs 14:41:46 Peak Outflow = 3.72 cfs Peak Elevation = 282.22 ft Flow (cfs) 0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 I I I I I 1 I I I I 0.0 - * x * .02 - x * x .03 - x x .05 - x X * .07 - x * X * .09 - x * X * .1 - x x .12 - x x .14 - x x .15 - x x .17 - x x .19 - x * x* .2 - * x * x .22 - * x * X .24 - * x * x .26 - * x * x .27 - * x * x .29 - * x * x .31 - * x * x .32 - * x * x TIME (hrs) x File: d: \ljo \20- 00 \20- 00pnd \5 OUT .HYD Qmax = 3.7 cfs * File: d: \ljo \20- 00 \20 -00pnd \5IN .HYD Qmax = 4.5 cfs POND -2 Version: 5.21 S /N: Page 1 EXECUTED: 09 -13 -2000 14:41:46 STORM # 2 Return Freq: 10 years * * * * * * * * * * * * * * * * * * * * * * * * * ** * * * SILK STOCKING LOUNGE * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * ** * * * * * * * * * * * * * * * * ** SUMMARY OF ROUTING COMPUTATIONS * * * * * * * * * * * * * * * * ** Pond File: d: \ljo \20- 00 \20- 00pnd \20 -00 .PND Inflow Hydrograph: d: \ljo \20- 00 \20- 00pnd \10IN .HYD Outflow Hydrograph: d: \ljo \20- 00 \20- 00pnd \10 OUT .HYD Starting Pond W.S. Elevation = 281.70 ft * * * ** Summary of Peak Outflow and Peak Elevation * * * ** Peak Inflow = 5.06 cfs Peak Outflow = 4.17 cfs Peak Elevation = 282.26 ft * * * ** Summary of Approximate Peak Storage * * * ** Initial Storage = 0.00 ac -ft Peak Storage From Storm = 0.01 ac -ft Total Storage in Pond = 0.01 ac -ft POND -2 Version: 5.21 S /N: Page 3 STORM # 2 Return Freq: 10 years Pond File: d: \ljo \20- 00 \20 00pnd \20 - 00 .PND Inflow Hydrograph: d: \ljo \20- 00 \20 00pnd \10IN .HYD Outflow Hydrograph: d: \ljo \20- 00 \20 00pnd \10 OUT .HYD EXECUTED: 09 -13 -2000 Peak Inflow = 5.06 cfs 14:41:46 Peak Outflow = 4.17 cfs Peak Elevation = 282.26 ft Flow (cfs) 0.0 1.0 2.0 3.0 4.0 5.0 6.0 7.0 8.0 9.0 10.0 11.0 • 0.0 - * x * .02 - x * x * .03 - x * X * .05 - x * x .07 - x x .09 - x * x .1 - x * x .12 - x * x .14 - x * X * .15 - x * x .17 - x * x * .19 - x * * .2 - *x * x .22 - * x * x .24 - * x * x .26 - * x * x .27 - * x * X .29 - * x * x .31 - * x * X .32 - * x * X TIME (hrs) x File: d: \ljo \20- 00 \20- 00pnd \10 OUT .HYD Qmax = 4.2 cfs * File: d: \ljo \20- 00 \20- 00pnd \10IN .HYD Qmax = 5.1 cfs POND -2 Version: 5.21 S /N: Page 1 EXECUTED: 09 -13 -2000 14:41:46 STORM # 3 Return Freq: 25 years * * * * * * * * * * * * * * * * * * * * * * * * * ** * * SILK STOCKING LOUNGE * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * ** * * * * * * * * * * * * * * * * ** SUMMARY OF ROUTING COMPUTATIONS * * * * * * * * * * * * * * * * ** Pond File: d: \ljo \20- 00 \20 00pnd \20 - 00 .PND Inflow Hydrograph: d: \ljo \20- 00 \20 00pnd \25IN .HYD Outflow Hydrograph: d: \ljo \20- 00 \20- 00pnd \25 OUT .HYD Starting Pond W.S. Elevation = 281.70 ft * * * ** Summary of Peak Outflow and Peak Elevation * * * ** Peak Inflow = 5.78 cfs Peak Outflow = 4.76 cfs Peak Elevation = 282.31 ft * * * ** Summary of Approximate Peak Storage * * * ** Initial Storage = 0.00 ac -ft Peak Storage From Storm = 0.02 ac -ft Total Storage in Pond = 0.02 ac -ft POND -2 Version: 5.21 S /N: Page 3 STORM # 3 Return Freq: 25 years Pond File: d: \ljo \20- 00 \20- 00pnd \20 -00 .PND Inflow Hydrograph: d: \ljo \20- 00 \20 -00pnd \25IN .HYD Outflow Hydrograph: d: \ljo \20- 00 \20- 00pnd \25 OUT .HYD EXECUTED: 09 -13 -2000 Peak Inflow = 5.78 cfs 14:41:46 Peak Outflow = 4.76 cfs Peak Elevation = 282.31 ft Flow (cfs) 0.0 1.0 2.0 3.0 4.0 5.0 6.0 7.0 8.0 9.0 10.0 11.0 • I I I I I I I I 0.0 - * x* .02 - x * x * .03 - x * x .05 - x x .07 - x X * .09 - x * X * .1 - x * X * .12 - x * X * .14 - x * X * .15 - x X * .17 - x * X * .19 - x * X* .2 - * x * x .22 - * x * X .24 - * x * X .26 - * x * x .27 - * x * x .29 - * x * x .31 - * x * x .32 - * x * x TIME (hrs) x File: d: \ljo \20- 00 \20- 00pnd \25 OUT .HYD Qmax = 4.8 cfs * File: d: \ljo \20- 00 \20 -O0pnd \25IN .HYD Qmax = 5.8 cfs POND - Version: 5.21 S /N: Page 1 EXECUTED: 09 -13 -2000 17:22:51 STORM # 4 Return Freq: 50 years * * * * * * * * * * * * * * * * * * * * * * * * * ** * * SILK STOCKING LOUNGE * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * ** * * * * * * * * * * * * * * * * ** SUMMARY OF ROUTING COMPUTATIONS * * * * * * * * * * * * * * * * ** Pond File: c: \ljo \20- 00 \20 00pnd \20 - 00 .PND Inflow Hydrograph: c: \ljo \20- 00 \20 00pnd \50IN .HYD Outflow Hydrograph: c: \ljo \20- 00 \20 00pnd \50 OUT .HYD Starting Pond W.S. Elevation = 281.70 ft * * * ** Summary of Peak Outflow and Peak Elevation * * * ** Peak Inflow = 6.53 cfs Peak Outflow = 5.38 cfs Peak Elevation = 282.37 ft * * * ** Summary of Approximate Peak Storage * * * ** Initial Storage = 0.00 ac -ft Peak Storage From Storm = 0.02 ac -ft Total Storage in Pond = 0.02 ac -ft POND -2 Version: 5.21 S /N: Page 3 STORM # 4 Return Freq: 50 years Pond File: c: \ljo \20- 00 \20- 00pnd \20 -00 .PND Inflow Hydrograph: c: \ljo \20- 00 \20- 00pnd \50IN .HYD Outflow Hydrograph: c: \ljo \20- 00 \20- 00pnd \50 OUT .HYD EXECUTED: 09 -13 -2000 Peak Inflow = 6.53 cfs 17:22:51 Peak Outflow = 5.38 cfs Peak Elevation = 282.37 ft Flow (cfs) 0.0 1.0 2.0 3.0 4.0 5.0 6.0 7.0 8.0 9.0 10.0 11.0 • I I I I I I I I I I 0.0 - * X* .02 - x * X * .03 - x x .05 - x x .07 - x x .09 - x * X * .1 - x * X * .12 - x * X * .14 - x x .15 - x x .17 - x x * .19 - x * .2 - * x * x .22 - * x * x .24 - * x * x .26 - * x * X .27 - * x * X .29 - * x * X .31 - * x * x .32 - * x * X TIME (hrs) x File: c: \ljo \20- 00 \20- 00pnd \50 OUT .HYD Qmax = 5.4 cfs * File: c: \ljo \20- 00 \20- 00pnd \50IN .HYD Qmax = 6.5 cfs POND -2 Version: 5.21 S /N: Page 1 EXECUTED: 09 -13 -2000 17:22:51 STORM # 5 Return Freq: 100 years * * * * * * * * * * * * * * * * * * * * * * * * * ** * * SILK STOCKING LOUNGE * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * ** * * * * * * * * * * * * * * * * ** SUMMARY OF ROUTING COMPUTATIONS * * * * * * * * * * * * * * * * ** Pond File: c: \ljo \20- 00 \20 OOpnd \20 - 00 .PND Inflow Hydrograph: c: \ljo \20- 00 \20- OOpnd \100IN .HYD Outflow Hydrograph: c: \ljo \20- 00 \20 - OOpnd \100 OUT .HYD Starting Pond W.S. Elevation = 281.70 ft * * * ** Summary of Peak Outflow and Peak Elevation * * * ** Peak Inflow = 6.82 cfs Peak Outflow = 5.62 cfs Peak Elevation = 282.38 ft * * * ** Summary of Approximate Peak Storage * * * ** Initial Storage = 0.00 ac -ft Peak Storage From Storm = 0.02 ac -ft Total Storage in Pond = 0.02 ac -ft POND -2 Version: 5.21 S /N: Page 3 STORM # 5 Return Freq: 100 years Pond File: c: \ljo \20- 00 \20- 00pnd \20 - 00 .PND Inflow Hydrograph: c: \ljo \20- 00 \20 00pnd \100IN .HYD Outflow Hydrograph: c: \ljo \20- 00 \20 -00pnd \100 OUT .HYD EXECUTED: 09 -13 -2000 Peak Inflow = 6.82 cfs 17:22:51 Peak Outflow = 5.62 cfs Peak Elevation = 282.38 ft Flow (cfs) 0.0 1.0 2.0 3.0 4.0 5.0 6.0 7.0 8.0 9.0 10.0 11.0 • I I I I I I I I I 0.0 - * x* .02 - x * x * .03 - x X * .05 - x x .07 - x x .09 - x * X * .1 - x * X * .12 - x * X * .14 - x * X * .15 - x * x .17 - x * x .19 - x * x* .2 - * x * x .22 - * x * x .24 - * x * x .26 - * x * x .27 - * x * X .29 - * x * X .31 - * x * x .32 - * x * x TIME (hrs) x File: c: \ljo \20- 00 \20 - 00pnd \100 OUT .HYD Qmax = 5.6 cfs * File: c: \ljo \20- 00 \20- 00pnd \100IN .HYD Qmax = 6.8 cfs