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HomeMy WebLinkAbout20061804 Ver 36_Stormwater Calculations_20201231�O/23/2020 ENGINEERING 801 EAST WASHINGTON STREET P.O. BOX 1108 NASHVILLE, N.C. 27856 PHONE: (252) 459-8196 WWW,STOCKSENCINEERING.COM #!" #!"#!"#!"█n 150250300250300 300300 200150 2 0 0 200250 250 250 200250150 3 0 0300 300 300 2 5 0 250 150 3 0 0 300 300200300 3 0 0 300 1501502502 0 0 2 5 0 2502 5 0 2 5 0 250 250 2502 0 0 2 0 0200250300 250 200 3 0 0 250 200 200¬«42 ¬«42 D D R D RDMUSTANG LNCECIL RDTHANKSGIVING FIRE RDNEW CREECH RDBENNI N G CIRB Y RD RDOL D S M I T H R DTAL L Y HO DRWYNDFALL LN HIGH CHAPARRAL DR WALKER RUNSANIDINE LN BRADFORD CIR ALBEMARLE DRAPAC H E DR LYNCH RDRAINBOW CANYON RDPREAKNESS DRPORTOFI NO DRSO U T H W I C K AVE PERCHERORA IN T R E E DR SICILLY DRT US C A N R D GPARAGGI CTHIDDEN A C R E S WADSWORTH RDKEN T U C K Y DRB RAGG CTDEER RIDGE DRWATSON CIRR IC H M O N D D RBARRETTE L N MOTORCYCLE RD J O R D A N N A R R O N R D STOCKBRID G E DR NORTHFORT DRBUCKHORN LN CARROLL RDDUNMORE D R B U F F A L O R D RED B A Y LNCARRIE DRNORWOOD DRALI WAY F L O RENCE DR HILLSDALE DRWINDHA M WAYP E R S IM M O N CIRSARA LNVERCELLI DRB uffalo C rMill CrBuffalo Cr Mill CrBuffalo CrN e u s e R i v e r MurphyCemO'Neal Cem BattenCem Jeffrey Cem Flowers 20' 7 52 FEET 30" 3948 000 30" 7 690 40' 7 35° 2 FEET 47 43 00 0 22' 50 78° 39 7 51 7 3939 40 49 39 190 41 4639 37' 39 38 42 This map was produced to conNational G eo spatial Program US T opo PA meta data file associated with this prod CONTOUR INTERVAL 1NORTH A MERICA N V ERTICAL D SC ALE 1:24 00 1 0.5 0 MILES 1000 0 1000 2000 3000 4000 5000 FEET 1000 500 0 METERS KI LOMETERS00.51 Imagery...................................................NAIP, May 2 012Roads..............................................©2006-2012 TomTomNames..........................................................GNIS, 2 013Hydrography....................National Hydrography Dataset, 2012Contours............................National Elevation Dataset, 2008Boundaries....................Census, IBWC, IB C, USGS, 1972 - 2012 North A merican Datum of 19 83 (NA D83)World Geodetic System of 198 4 (WG S84). Projection and1 000-m eter grid: Universal Transverse Merca tor, Zone 17S Produced by the United States Geological Survey 10 000-foo t ticks: No rth Ca ro lina Co ordinate System of 198 3 U.S. Natio nal G rid 100,000-m Square ID Grid Zone Designation QV 17S × ØMN GN UTM GRID AND 2013 M AGNETIC NO RT HDECLINATION AT CE NTER OF SHE ET 1° 34´28 MILS 9° 17´165 MILS Project:Whitley Corner Location:Flowers, NC Date:2-Nov-20 Basin ID:1 Drainage Area (A)Acres Impervious Area Acres % Impervious (I) Water Quality Volume Calculate Rv:Rv = 0.05+.9 X I Rv =0.55 WQV =3630 X RD X Rv X A RD = 1.00 Inch WQV = 30,750 CF Surface Area Average Depth =3.00 SA/DA Ratio = 2.51 (Choose SA/DA Ration from the NC BMP Maunual Table 1 or 2) Surface Area =(SA/DA Ratio / 100) X Area (Ac.) / 43,560 (SF/Ac.) 16,838 SF Orifice Sizing CDAo CD =0.6 g=32.2 FT/S2 Ho = H/3=0.33 FT H=1 FT Ao =0.05 FEET Design Pipe =3 INCH Design Orifice Q =0.14 CFS Days to Drain =2.6 Wetland Plants - Vegetative Shelf Vegetative Shelf SurfaceArea =3405 SF # of Wetland Plants =851 Design Orifice Q= Wet Pond Design 15.4 8.56 55.56% 2𝑔𝐻𝑜 ⬚ Project:Whitley Corner Location:Flowers, NC Date:2-Nov-20 Basin ID:2 Drainage Area (A)Acres Impervious Area Acres % Impervious (I) Water Quality Volume Calculate Rv:Rv = 0.05+.9 X I Rv =0.66 WQV =3630 X RD X Rv X A RD = 1.00 Inch WQV = 42,598 CF Surface Area Average Depth =3.00 SA/DA Ratio = 2.51 (Choose SA/DA Ration from the NC BMP Maunual Table 1 or 2) Surface Area =(SA/DA Ratio / 100) X Area (Ac.) / 43,560 (SF/Ac.) 19,298 SF Orifice Sizing CDAo CD =0.6 g=32.2 FT/S2 Ho = H/3=0.33 FT H=1 FT Ao =0.09 FEET Design Pipe =4 INCH Design Orifice Q =0.24 CFS Days to Drain =2.0 Wetland Plants - Vegetative Shelf Vegetative Shelf SurfaceArea =2235 SF # of Wetland Plants =559 Design Orifice Q= Wet Pond Design 17.65 12.06 68.32% 2𝑔𝐻𝑜 ⬚ FOREBAY/POND VOLUME COMPARISON 11/16/2020 WET DETENTION FOREBAY VOLUME COMPARISON SCM 1 ELEVATION SURFACE AREA INCREMENTAL VOLUME ELEVATION SURFACE AREA INCREMENTAL VOLUME 0.0 256.0 0.0 709.0 0.0 257.0 1,418.0 255.0 0.0 1,591.0 2,496.0 258.0 1,764.0 256.0 4,992.0 1,953.0 5,535.0 259.0 2,142.0 257.0 6,078.0 2,347.0 6,667.5 260.0 2,552.0 258.0 7,257.0 2,774.0 7,875.0 261.0 2,996.0 259.0 8,493.0 1,680.5 9,125.0 262.0 3,726.0 260.0 9,757.0 SUM =11,054.5 10,402.5 261.0 11,048.0 6,445.5 262.0 14,734.0 SUM =48,546.5 Forebay is 18.5%of Pond. Pond Average Depth:3.23 Feet FOREBAY VOLUME POND VOLUME FOREBAY/POND VOLUME COMPARISON 11/19/2020 WET DETENTION FOREBAY VOLUME COMPARISON SCM 2 ELEVATION SURFACE AREA INCREMENTAL VOLUME ELEVATION SURFACE AREA INCREMENTAL VOLUME 229.0 102.72 300.7 230.0 498.61 0.0 700.5 0.0 0.0 231.0 902.44 0.0 1,372.4 0.0 0.0 232.0 1,842.3 943.6 1,872.5 234.0 1,887.1 233.0 1,902.7 2,156.8 5,872.9 235.0 2,426.5 234.0 9,843.1 2,728.5 10,260.8 236.0 3,030.5 235.0 10,678.6 3,363.9 11,113.8 237.0 3,697.4 236.0 11,549.1 2,127.4 12,001.7 238.0 4,812.4 237.0 12,454.4 SUM =11,320.3 13,712.2 238.0 14,970.0 SUM =57,207.5 Forebay is 16.5%of Pond. Pond Average Depth:3.46 Feet FOREBAY VOLUME POND VOLUME Assumptions: Unit Weight of Saturated Soil [gsat] =120 pcf Unit Weight of Concrete [gconc] =147 pcf Unit Weight of Water [gw] =62.4 pcf Base Length [L] =10 feet Same if Extended Moorbase Base Width [W] =12 feet Same if Extended Moorbase Known: Inside Diameter of Wetwell (ft) =ID 2'X3' Box Outside Diameter of Wetwell (ft) =OD 2'X3' Box Depth of Structure (ft) =D Minimum Base Slab Thickness (in) =T Minimum Top Slab Thickness (in) =Tts Average Invert Thickness (in) =Ti Base Slab Area (ft2) =A (L x W) or pi(L/2)2 Displacement Volume, Wetwell (ft2) =Vw pi(OD/2)2D Displacement Volume, Base Slab (ft2) =Vbs A(T/12) Buoyant Force =B (Vw + W bs) x gw Effective Weight of Soil Over Slab Extension =S (gsat - gw) x (A-pi(OD/2)2)D Structure Weight, Walls =Ww (pi(OD/2)2 - pi(ID/2)2)Dgconc Structure Weight, Invert =Wi pi(ID/2)2Tigconc Structure Weight, Top Slab =Wts pi(OD/2)2(Tts/12)gconc Structure Weight, Base Slab =Wbs A(T/12)gconc Structure Weight, Total =W W w + W i + W ts + W bs Table of Calculations: A Ww Wi Wts Wbs W (ft2)(lbs)(lbs)(lbs)(lbs)(lbs) 78.50 2120.82 3528.883 0.00 11539.5 17189.199 Vw Vbs B S W + S =36760.74 (ft3)(ft3)(lbs)(lbs)B =15535.50 FOS 170.47 78.50 15535.50 19571.54 YES 2.37 Conclusion: Since the weight of the structure and the base slab is greater than the buoyancy for of the wetwell, the resistance to buoyant force is provided. Buoyancy Resistance Calculations for Outlet 12 0 12 Is W + S > B? 5.53 5.78 6.5 SCM 1 Assumptions: Unit Weight of Saturated Soil [gsat] =120 pcf Unit Weight of Concrete [gconc] =147 pcf Unit Weight of Water [gw] =62.4 pcf Base Length [L] =10 feet Same if Extended Moorbase Base Width [W] =12 feet Same if Extended Moorbase Known: Inside Diameter of Wetwell (ft) =ID 2'X3' Box Outside Diameter of Wetwell (ft) =OD 2'X3' Box Depth of Structure (ft) =D Minimum Base Slab Thickness (in) =T Minimum Top Slab Thickness (in) =Tts Average Invert Thickness (in) =Ti Base Slab Area (ft2) =A (L x W) or pi(L/2)2 Displacement Volume, Wetwell (ft2) =Vw pi(OD/2)2D Displacement Volume, Base Slab (ft2) =Vbs A(T/12) Buoyant Force =B (Vw + W bs) x gw Effective Weight of Soil Over Slab Extension =S (gsat - gw) x (A-pi(OD/2)2)D Structure Weight, Walls =Ww (pi(OD/2)2 - pi(ID/2)2)Dgconc Structure Weight, Invert =Wi pi(ID/2)2Tigconc Structure Weight, Top Slab =Wts pi(OD/2)2(Tts/12)gconc Structure Weight, Base Slab =Wbs A(T/12)gconc Structure Weight, Total =W W w + W i + W ts + W bs Table of Calculations: A Ww Wi Wts Wbs W (ft2)(lbs)(lbs)(lbs)(lbs)(lbs) 78.50 1925.05 3528.883 0.00 11539.5 16993.431 Vw Vbs B S W + S =34758.37 (ft3)(ft3)(lbs)(lbs)B =14553.61 FOS 154.73 78.50 14553.61 17764.93 YES 2.39 Conclusion: Since the weight of the structure and the base slab is greater than the buoyancy for of the wetwell, the resistance to buoyant force is provided. Buoyancy Resistance Calculations for Outlet 12 0 12 Is W + S > B? 5.53 5.78 5.9 SCM 2 1 - Wet Pond 1 Drainage Area 2 - Wet Pond 1 Outflow 1 Watershed Model Schematic Hydraflow Hydrographs by Intelisolve v9.22 Project: Wet Pond 1 11-13-20.gpw Monday, Nov 16, 2020 Hydrograph Return Period Recap 2 Hyd. Hydrograph Inflow Peak Outflow (cfs)Hydrograph No. type Hyd(s)description (origin) 1-Yr 2-Yr 3-Yr 5-Yr 10-Yr 25-Yr 50-Yr 100-Yr 1 SCS Runoff ------- 35.89 ------- 4.372 ------- 80.38 ------- ------- 135.91 Wet Pond 1 Drainage Area 2 Reservoir 1 0.832 ------- 0.149 ------- 61.16 ------- ------- 128.25 Wet Pond 1 Outflow Proj. file: Wet Pond 1 11-13-20.gpw Monday, Nov 16, 2020 Hydraflow Hydrographs by Intelisolve v9.22 Hydrograph Summary Report 3 Hyd. Hydrograph Peak Time Time to Hyd. Inflow Maximum Total Hydrograph No. type flow interval peak volume hyd(s) elevation strge used description (origin) (cfs) (min) (min) (cuft) (ft) (cuft) 1 SCS Runoff 35.89 1 721 90,912 ---- ------ ------ Wet Pond 1 Drainage Area 2 Reservoir 0.832 1 987 64,989 1 265.02 65,714 Wet Pond 1 Outflow Wet Pond 1 11-13-20.gpw Return Period: 1 Year Monday, Nov 16, 2020 Hydraflow Hydrographs by Intelisolve v9.22 Hydrograph Report Hydraflow Hydrographs by Intelisolve v9.22 Monday, Nov 16, 2020 Hyd. No. 1 Wet Pond 1 Drainage Area Hydrograph type = SCS Runoff Peak discharge = 35.89 cfs Storm frequency = 1 yrs Time to peak = 721 min Time interval = 1 min Hyd. volume = 90,912 cuft Drainage area = 15.400 ac Curve number = 87 Basin Slope = 2.0 %Hydraulic length = 1900 ft Tc method = KIRPICH Time of conc. (Tc) = 11.77 min Total precip. = 2.90 in Distribution = Type II Storm duration = 24 hrs Shape factor = 484 4 0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560 Q (cfs) 0.00 0.00 10.00 10.00 20.00 20.00 30.00 30.00 40.00 40.00 Q (cfs) Time (min) Wet Pond 1 Drainage Area Hyd. No. 1 -- 1 Year Hyd No. 1 Hydrograph Report Hydraflow Hydrographs by Intelisolve v9.22 Monday, Nov 16, 2020 Hyd. No. 2 Wet Pond 1 Outflow Hydrograph type = Reservoir Peak discharge = 0.832 cfs Storm frequency = 1 yrs Time to peak = 987 min Time interval = 1 min Hyd. volume = 64,989 cuft Inflow hyd. No. = 1 - Wet Pond 1 Drainage Area Max. Elevation = 265.02 ft Reservoir name = Wet Pond 1 Max. Storage = 65,714 cuft Storage Indication method used. 5 0 300 600 900 1200 1500 1800 2100 2400 2700 3000 Q (cfs) 0.00 0.00 10.00 10.00 20.00 20.00 30.00 30.00 40.00 40.00 Q (cfs) Time (min) Wet Pond 1 Outflow Hyd. No. 2 -- 1 Year Hyd No. 2 Hyd No. 1 Total storage used = 65,714 cuft Pond Report 6 Hydraflow Hydrographs by Intelisolve v9.22 Monday, Nov 16, 2020 Pond No. 1 - Wet Pond 1 Pond Data Contours - User-defined contour areas. Average end area method used for volume calculation. Begining Elevation = 262.00 ft Stage / Storage Table Stage (ft) Elevation (ft) Contour area (sqft) Incr. Storage (cuft) Total storage (cuft) 0.00 262.00 18,460 0 0 1.00 263.00 20,623 19,542 19,542 2.00 264.00 22,843 21,733 41,275 3.00 265.00 25,119 23,981 65,256 4.00 266.00 27,451 26,285 91,541 4.50 266.50 29,839 14,323 105,863 Culvert / Orifice Structures Weir Structures [A] [B] [C] [PrfRsr] [A] [B] [C] [D] Rise (in)= 42.00 3.50 0.00 0.00 Span (in)= 42.00 3.50 0.00 0.00 No. Barrels = 1 1 0 0 Invert El. (ft)= 258.40 262.00 0.00 0.00 Length (ft)= 46.00 0.25 0.00 0.00 Slope (%)= 1.00 0.10 0.00 n/a N-Value = .013 .013 .013 n/a Orifice Coeff.= 0.60 0.60 0.60 0.60 Multi-Stage = n/a Yes No No Crest Len (ft)= 20.00 20.00 0.00 0.00 Crest El. (ft)= 265.15 265.00 0.00 0.00 Weir Coeff.= 3.33 2.60 3.33 3.33 Weir Type = Riser Broad --- --- Multi-Stage = Yes No No No Exfil.(in/hr)= 0.000 (by Wet area) TW Elev. (ft)= 0.00 Note: Culvert/Orifice outflows are analyzed under inlet (ic) and outlet (oc) control. Weir risers checked for orifice conditions (ic) and submergence (s). 0.0 20.0 40.0 60.0 80.0 100.0 120.0 140.0 160.0 180.0 200.0 Stage (ft) 0.00 262.00 1.00 263.00 2.00 264.00 3.00 265.00 4.00 266.00 5.00 267.00 Elev (ft) Discharge (cfs) Stage / Discharge Total Q Hydrograph Summary Report 7 Hyd. Hydrograph Peak Time Time to Hyd. Inflow Maximum Total Hydrograph No. type flow interval peak volume hyd(s) elevation strge used description (origin) (cfs) (min) (min) (cuft) (ft) (cuft) 1 SCS Runoff 80.38 1 721 209,811 ---- ------ ------ Wet Pond 1 Drainage Area 2 Reservoir 61.16 1 726 182,857 1 265.72 84,185 Wet Pond 1 Outflow Wet Pond 1 11-13-20.gpw Return Period: 10 Year Monday, Nov 16, 2020 Hydraflow Hydrographs by Intelisolve v9.22 Hydrograph Report Hydraflow Hydrographs by Intelisolve v9.22 Monday, Nov 16, 2020 Hyd. No. 1 Wet Pond 1 Drainage Area Hydrograph type = SCS Runoff Peak discharge = 80.38 cfs Storm frequency = 10 yrs Time to peak = 721 min Time interval = 1 min Hyd. volume = 209,811 cuft Drainage area = 15.400 ac Curve number = 87 Basin Slope = 2.0 %Hydraulic length = 1900 ft Tc method = KIRPICH Time of conc. (Tc) = 11.77 min Total precip. = 5.26 in Distribution = Type II Storm duration = 24 hrs Shape factor = 484 8 0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560 Q (cfs) 0.00 0.00 10.00 10.00 20.00 20.00 30.00 30.00 40.00 40.00 50.00 50.00 60.00 60.00 70.00 70.00 80.00 80.00 90.00 90.00 Q (cfs) Time (min) Wet Pond 1 Drainage Area Hyd. No. 1 -- 10 Year Hyd No. 1 Hydrograph Report Hydraflow Hydrographs by Intelisolve v9.22 Monday, Nov 16, 2020 Hyd. No. 2 Wet Pond 1 Outflow Hydrograph type = Reservoir Peak discharge = 61.16 cfs Storm frequency = 10 yrs Time to peak = 726 min Time interval = 1 min Hyd. volume = 182,857 cuft Inflow hyd. No. = 1 - Wet Pond 1 Drainage Area Max. Elevation = 265.72 ft Reservoir name = Wet Pond 1 Max. Storage = 84,185 cuft Storage Indication method used. 9 0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560 Q (cfs) 0.00 0.00 10.00 10.00 20.00 20.00 30.00 30.00 40.00 40.00 50.00 50.00 60.00 60.00 70.00 70.00 80.00 80.00 90.00 90.00 Q (cfs) Time (min) Wet Pond 1 Outflow Hyd. No. 2 -- 10 Year Hyd No. 2 Hyd No. 1 Total storage used = 84,185 cuft Hydrograph Summary Report 10 Hyd. Hydrograph Peak Time Time to Hyd. Inflow Maximum Total Hydrograph No. type flow interval peak volume hyd(s) elevation strge used description (origin) (cfs) (min) (min) (cuft) (ft) (cuft) 1 SCS Runoff 135.91 1 721 366,176 ---- ------ ------ Wet Pond 1 Drainage Area 2 Reservoir 128.25 1 723 338,954 1 266.13 95,353 Wet Pond 1 Outflow Wet Pond 1 11-13-20.gpw Return Period: 100 Year Monday, Nov 16, 2020 Hydraflow Hydrographs by Intelisolve v9.22 Hydrograph Report Hydraflow Hydrographs by Intelisolve v9.22 Monday, Nov 16, 2020 Hyd. No. 1 Wet Pond 1 Drainage Area Hydrograph type = SCS Runoff Peak discharge = 135.91 cfs Storm frequency = 100 yrs Time to peak = 721 min Time interval = 1 min Hyd. volume = 366,176 cuft Drainage area = 15.400 ac Curve number = 87 Basin Slope = 2.0 %Hydraulic length = 1900 ft Tc method = KIRPICH Time of conc. (Tc) = 11.77 min Total precip. = 8.21 in Distribution = Type II Storm duration = 24 hrs Shape factor = 484 11 0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 Q (cfs) 0.00 0.00 20.00 20.00 40.00 40.00 60.00 60.00 80.00 80.00 100.00 100.00 120.00 120.00 140.00 140.00 Q (cfs) Time (min) Wet Pond 1 Drainage Area Hyd. No. 1 -- 100 Year Hyd No. 1 Hydrograph Report Hydraflow Hydrographs by Intelisolve v9.22 Monday, Nov 16, 2020 Hyd. No. 2 Wet Pond 1 Outflow Hydrograph type = Reservoir Peak discharge = 128.25 cfs Storm frequency = 100 yrs Time to peak = 723 min Time interval = 1 min Hyd. volume = 338,954 cuft Inflow hyd. No. = 1 - Wet Pond 1 Drainage Area Max. Elevation = 266.13 ft Reservoir name = Wet Pond 1 Max. Storage = 95,353 cuft Storage Indication method used. 12 0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560 Q (cfs) 0.00 0.00 20.00 20.00 40.00 40.00 60.00 60.00 80.00 80.00 100.00 100.00 120.00 120.00 140.00 140.00 Q (cfs) Time (min) Wet Pond 1 Outflow Hyd. No. 2 -- 100 Year Hyd No. 2 Hyd No. 1 Total storage used = 95,353 cuft 1 - Wet Pond 2 Drainage Area 2 - Wet Pond 2 Outflow 1 Watershed Model Schematic Hydraflow Hydrographs by Intelisolve v9.22 Project: Wet Pond 2 11-13-20.gpw Monday, Nov 16, 2020 Hydrograph Return Period Recap 2 Hyd. Hydrograph Inflow Peak Outflow (cfs)Hydrograph No. type Hyd(s)description (origin) 1-Yr 2-Yr 3-Yr 5-Yr 10-Yr 25-Yr 50-Yr 100-Yr 1 SCS Runoff ------- 43.41 57.70 46.71 ------- 99.24 ------- ------- 171.36 Wet Pond 2 Drainage Area 2 Reservoir 1 0.714 3.971 1.143 ------- 58.76 ------- ------- 101.16 Wet Pond 2 Outflow Proj. file: Wet Pond 2 11-13-20.gpw Monday, Nov 16, 2020 Hydraflow Hydrographs by Intelisolve v9.22 Hydrograph Summary Report 3 Hyd. Hydrograph Peak Time Time to Hyd. Inflow Maximum Total Hydrograph No. type flow interval peak volume hyd(s) elevation strge used description (origin) (cfs) (min) (min) (cuft) (ft) (cuft) 1 SCS Runoff 43.41 1 719 98,405 ---- ------ ------ Wet Pond 2 Drainage Area 2 Reservoir 0.714 1 1113 77,789 1 241.05 70,696 Wet Pond 2 Outflow Wet Pond 2 11-13-20.gpw Return Period: 1 Year Monday, Nov 16, 2020 Hydraflow Hydrographs by Intelisolve v9.22 Hydrograph Report Hydraflow Hydrographs by Intelisolve v9.22 Monday, Nov 16, 2020 Hyd. No. 1 Wet Pond 2 Drainage Area Hydrograph type = SCS Runoff Peak discharge = 43.41 cfs Storm frequency = 1 yrs Time to peak = 719 min Time interval = 1 min Hyd. volume = 98,405 cuft Drainage area = 17.650 ac Curve number = 85.9 Basin Slope = 2.0 %Hydraulic length = 1310 ft Tc method = KIRPICH Time of conc. (Tc) = 8.84 min Total precip. = 2.86 in Distribution = Type II Storm duration = 24 hrs Shape factor = 484 4 0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560 Q (cfs) 0.00 0.00 10.00 10.00 20.00 20.00 30.00 30.00 40.00 40.00 50.00 50.00 Q (cfs) Time (min) Wet Pond 2 Drainage Area Hyd. No. 1 -- 1 Year Hyd No. 1 Hydrograph Report Hydraflow Hydrographs by Intelisolve v9.22 Monday, Nov 16, 2020 Hyd. No. 2 Wet Pond 2 Outflow Hydrograph type = Reservoir Peak discharge = 0.714 cfs Storm frequency = 1 yrs Time to peak = 1113 min Time interval = 1 min Hyd. volume = 77,789 cuft Inflow hyd. No. = 1 - Wet Pond 2 Drainage Area Max. Elevation = 241.05 ft Reservoir name = Wet Pond 2 Max. Storage = 70,696 cuft Storage Indication method used. 5 0 300 600 900 1200 1500 1800 2100 2400 2700 3000 Q (cfs) 0.00 0.00 10.00 10.00 20.00 20.00 30.00 30.00 40.00 40.00 50.00 50.00 Q (cfs) Time (min) Wet Pond 2 Outflow Hyd. No. 2 -- 1 Year Hyd No. 2 Hyd No. 1 Total storage used = 70,696 cuft Pond Report 6 Hydraflow Hydrographs by Intelisolve v9.22 Monday, Nov 16, 2020 Pond No. 1 - Wet Pond 2 Pond Data Contours - User-defined contour areas. Average end area method used for volume calculation. Begining Elevation = 238.00 ft Stage / Storage Table Stage (ft) Elevation (ft) Contour area (sqft) Incr. Storage (cuft) Total storage (cuft) 0.00 238.00 19,782 0 0 1.00 239.00 21,688 20,735 20,735 2.00 240.00 24,135 22,912 43,647 3.00 241.00 26,921 25,528 69,175 4.00 242.00 30,595 28,758 97,933 5.00 243.00 35,244 32,920 130,852 5.50 243.50 38,734 18,495 149,347 Culvert / Orifice Structures Weir Structures [A] [B] [C] [PrfRsr] [A] [B] [C] [D] Rise (in)= 36.00 4.00 0.00 0.00 Span (in)= 36.00 4.00 0.00 0.00 No. Barrels = 1 1 0 0 Invert El. (ft)= 235.10 238.00 0.00 0.00 Length (ft)= 89.00 0.25 0.00 0.00 Slope (%)= 15.00 1.00 0.00 n/a N-Value = .013 .013 .013 n/a Orifice Coeff.= 0.60 0.60 0.60 0.60 Multi-Stage = n/a No No No Crest Len (ft)= 20.00 20.00 0.00 0.00 Crest El. (ft)= 241.15 243.00 0.00 0.00 Weir Coeff.= 3.33 2.60 3.33 3.33 Weir Type = Riser Broad --- --- Multi-Stage = Yes No No No Exfil.(in/hr)= 0.000 (by Wet area) TW Elev. (ft)= 0.00 Note: Culvert/Orifice outflows are analyzed under inlet (ic) and outlet (oc) control. Weir risers checked for orifice conditions (ic) and submergence (s). 0.0 10.0 20.0 30.0 40.0 50.0 60.0 70.0 80.0 90.0 100.0 110.0 Stage (ft) 0.00 238.00 1.00 239.00 2.00 240.00 3.00 241.00 4.00 242.00 5.00 243.00 6.00 244.00 Elev (ft) Discharge (cfs) Stage / Discharge Total Q Hydrograph Summary Report 7 Hyd. Hydrograph Peak Time Time to Hyd. Inflow Maximum Total Hydrograph No. type flow interval peak volume hyd(s) elevation strge used description (origin) (cfs) (min) (min) (cuft) (ft) (cuft) 1 SCS Runoff 99.24 1 719 231,666 ---- ------ ------ Wet Pond 2 Drainage Area 2 Reservoir 58.76 1 725 207,998 1 242.06 99,925 Wet Pond 2 Outflow Wet Pond 2 11-13-20.gpw Return Period: 10 Year Monday, Nov 16, 2020 Hydraflow Hydrographs by Intelisolve v9.22 Hydrograph Report Hydraflow Hydrographs by Intelisolve v9.22 Monday, Nov 16, 2020 Hyd. No. 1 Wet Pond 2 Drainage Area Hydrograph type = SCS Runoff Peak discharge = 99.24 cfs Storm frequency = 10 yrs Time to peak = 719 min Time interval = 1 min Hyd. volume = 231,666 cuft Drainage area = 17.650 ac Curve number = 85.9 Basin Slope = 2.0 %Hydraulic length = 1310 ft Tc method = KIRPICH Time of conc. (Tc) = 8.84 min Total precip. = 5.17 in Distribution = Type II Storm duration = 24 hrs Shape factor = 484 8 0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 Q (cfs) 0.00 0.00 20.00 20.00 40.00 40.00 60.00 60.00 80.00 80.00 100.00 100.00 Q (cfs) Time (min) Wet Pond 2 Drainage Area Hyd. No. 1 -- 10 Year Hyd No. 1 Hydrograph Report Hydraflow Hydrographs by Intelisolve v9.22 Monday, Nov 16, 2020 Hyd. No. 2 Wet Pond 2 Outflow Hydrograph type = Reservoir Peak discharge = 58.76 cfs Storm frequency = 10 yrs Time to peak = 725 min Time interval = 1 min Hyd. volume = 207,998 cuft Inflow hyd. No. = 1 - Wet Pond 2 Drainage Area Max. Elevation = 242.06 ft Reservoir name = Wet Pond 2 Max. Storage = 99,925 cuft Storage Indication method used. 9 0 240 480 720 960 1200 1440 1680 1920 2160 Q (cfs) 0.00 0.00 20.00 20.00 40.00 40.00 60.00 60.00 80.00 80.00 100.00 100.00 Q (cfs) Time (min) Wet Pond 2 Outflow Hyd. No. 2 -- 10 Year Hyd No. 2 Hyd No. 1 Total storage used = 99,925 cuft Hydrograph Summary Report 10 Hyd. Hydrograph Peak Time Time to Hyd. Inflow Maximum Total Hydrograph No. type flow interval peak volume hyd(s) elevation strge used description (origin) (cfs) (min) (min) (cuft) (ft) (cuft) 1 SCS Runoff 171.36 1 719 413,588 ---- ------ ------ Wet Pond 2 Drainage Area 2 Reservoir 101.16 1 725 389,271 1 243.39 145,106 Wet Pond 2 Outflow Wet Pond 2 11-13-20.gpw Return Period: 100 Year Monday, Nov 16, 2020 Hydraflow Hydrographs by Intelisolve v9.22 Hydrograph Report Hydraflow Hydrographs by Intelisolve v9.22 Monday, Nov 16, 2020 Hyd. No. 1 Wet Pond 2 Drainage Area Hydrograph type = SCS Runoff Peak discharge = 171.36 cfs Storm frequency = 100 yrs Time to peak = 719 min Time interval = 1 min Hyd. volume = 413,588 cuft Drainage area = 17.650 ac Curve number = 85.9 Basin Slope = 2.0 %Hydraulic length = 1310 ft Tc method = KIRPICH Time of conc. (Tc) = 8.84 min Total precip. = 8.14 in Distribution = Type II Storm duration = 24 hrs Shape factor = 484 11 0 120 240 360 480 600 720 840 960 1080 1200 1320 Q (cfs) 0.00 0.00 20.00 20.00 40.00 40.00 60.00 60.00 80.00 80.00 100.00 100.00 120.00 120.00 140.00 140.00 160.00 160.00 180.00 180.00 Q (cfs) Time (min) Wet Pond 2 Drainage Area Hyd. No. 1 -- 100 Year Hyd No. 1 Hydrograph Report Hydraflow Hydrographs by Intelisolve v9.22 Monday, Nov 16, 2020 Hyd. No. 2 Wet Pond 2 Outflow Hydrograph type = Reservoir Peak discharge = 101.16 cfs Storm frequency = 100 yrs Time to peak = 725 min Time interval = 1 min Hyd. volume = 389,271 cuft Inflow hyd. No. = 1 - Wet Pond 2 Drainage Area Max. Elevation = 243.39 ft Reservoir name = Wet Pond 2 Max. Storage = 145,106 cuft Storage Indication method used. 12 0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560 Q (cfs) 0.00 0.00 20.00 20.00 40.00 40.00 60.00 60.00 80.00 80.00 100.00 100.00 120.00 120.00 140.00 140.00 160.00 160.00 180.00 180.00 Q (cfs) Time (min) Wet Pond 2 Outflow Hyd. 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