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BRIGGS

VP

W3

W4

W5

Drainage Diagram for 2608-PROPOSED-SITE PLANSPrepared by Tetra Tech Rizzo, Printed 11/7/2008

HydroCAD 8.50 s/n 005923 2007 HydroCAD Software Solutions LLC

Subcat Reach Pond Link

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Type III 24-hr 100yr Rainfall=6.80"2608-PROPOSED-SITE PLANSPrinted 11/7/2008Prepared by Tetra Tech Rizzo

Page 2HydroCAD 8.50 s/n 005923 2007 HydroCAD Software Solutions LLC

Summary for Reach BRIGGS:

Inflow Area = 277.860 ac, 21.15% Impervious, Inflow Depth = 3.55" for 100yr event

Inflow = 179.35 cfs @ 13.38 hrs, Volume= 82.187 afOutflow = 179.35 cfs @ 13.39 hrs, Volume= 82.187 af, Atten= 0%, Lag= 0.6 min

Routing by Sim-Route method, Time Span= 0.00-850.00 hrs, dt= 0.01 hrs

Summary for Pond VP:

Based on survey.Outlet based on survey and GIS.Assumed starting water elevation of 276.


Inflow = 132.54 cfs @ 12.18 hrs, Volume= 26.056 afOutflow = 64.11 cfs @ 12.99 hrs, Volume= 26.056 af, A tten= 52%, Lag= 48.8 minPrimary = 64.11 cfs @ 12.99 hrs, Volume= 26.056 af

Routing by Sim-Route method w/Net Flows, Time Span= 0.00-850.00 hrs, dt= 0.01 hrsStarting Elev= 276.00' Surf.Area= 108,274 sf Storage= 82,735 cfPeak Elev= 278.15' @ 13.00 hrs Surf.Area= 159,217 sf Storage= 377,617 cf (294,882 cf above start)

Plug-Flow detention time= 315.9 min calculated for 24.156 af (93% of inflow)Center-of-Mass det. time= 164.3 min ( 1,184.9 - 1,020.6 )

Volume Invert Avail.Storage Storage Description

#1 275.00' 517,106 cf Custom Stage Data (Irregular)Listed below (Recalc)

Elevation Surf.Area Perim. Inc.Store Cum.Store Wet.Area(feet) (sq-ft) (feet) (cubic-feet) (cubic-feet) (sq-ft)

275.00 59,600 1,675.0 0 0 59,600276.00 108,274 1,732.0 82,735 82,735 75,147277.00 138,633 1,895.0 123,141 205,876 122,229278.00 157,504 1,784.0 147,968 353,845 154,778279.00 169,088 1,731.0 163,262 517,106 169,706

Device Routing Invert Outlet Devices

#1 Primary 276.00' Custom Weir/Orifice, C= 2.62Head (feet) 0.00 1.00 2.00 4.00Width (feet) 2.86 6.85 10.68 34.84

Primary OutFlow Max=64.11 cfs @ 12.99 hrs HW=278.15' TW=276.46' (Dynamic Tailwater)1=Custom Weir/Orifice (Weir Controls 64.11 cfs @ 4.17 fps)

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Summary for Pond W3:


Inflow = 145.06 cfs @ 13.28 hrs, Volume= 65.058 afOutflow = 144.94 cfs @ 13.31 hrs, Volume= 65.058 af, Atten= 0%, Lag= 2.0 minPrimary = 144.94 cfs @ 13.31 hrs, Volume= 65.058 af

Routing by Sim-Route method w/Net Flows, Time Span= 0.00-850.00 hrs, dt= 0.01 hrsPeak Elev= 238.92' @ 13.31 hrs Surf.Area= 29,944 sf Storage= 13,655 cf

Plug-Flow detention time= 1.6 min calculated for 65.057 af (100% of inflow)Center-of-Mass det. time= 1.6 min ( 1,793.7 - 1,792.1 )




238.00 3,796 281.0 0 0 3,796239.00 33,267 1,696.0 16,100 16,100 226,413240.00 166,003 2,407.0 91,194 107,295 458,568


#1 Primary 238.00' Custom Weir/Orifice, C= 2.62Head (feet) 0.00 1.00 2.00 3.00Width (feet) 45.65 57.28 65.43 72.52

Primary OutFlow Max=144.94 cfs @ 13.31 hrs HW=238.92' TW=0.00' (Dynamic Tailwater)

1=Custom Weir/Orifice (Weir Controls 144.94 cfs @ 3.08 fps)


Inflow Area = 3.060 ac, 43.79% Impervious, Inflow Depth = 5.06" for 100yr eventInflow = 18.33 cfs @ 12.07 hrs, Volume= 1.291 afOutflow = 17.80 cfs @ 12.10 hrs, Volume= 1.291 af, Atten= 3%, Lag= 1.5 minPrimary = 17.80 cfs @ 12.10 hrs, Volume= 1.291 af


Plug-Flow detention time= 5.2 min calculated for 1.291 af (100% of inflow)

Center-of-Mass det. time= 4.9 min ( 800.1 - 795.2 )




274.00 22,630 730.0 0 0 22,630276.00 30,029 786.0 52,485 52,485 29,554

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#1 Primary 274.00' Custom Weir/Orifice, C= 2.62Head (feet) 0.00 2.00

Width (feet) 9.66 33.32#2 Primary 274.00' 195.0' long x 58.0' breadth Broad-Crested Rectangular WeirHead (feet) 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60Coef. (English) 2.68 2.70 2.70 2.64 2.63 2.64 2.64 2.63

Primary OutFlow Max=17.76 cfs @ 12.10 hrs HW=274.10' TW=253.56' (Dynamic Tailwater)1=Custom Weir/Orifice (Weir Controls 1.06 cfs @ 1.03 fps)2=Broad-Crested Rectangular Weir (Weir Controls 16.70 cfs @ 0.85 fps)


Inflow Area = 71.890 ac, 20.95% Impervious, Inflow Depth = 3.70" for 100yr eventInflow = 122.67 cfs @ 12.62 hrs, Volume= 22.183 af

Outflow = 36.90 cfs @ 13.69 hrs, Volume= 16.556 af, A tten= 70%, Lag= 64.0 minPrimary = 36.90 cfs @ 13.69 hrs, Volume= 16.556 af


Plug-Flow detention time= 344.8 min calculated for 16.556 af (75% of inflow)Center-of-Mass det. time= 263.9 min ( 1,102.7 - 838.9 )




252.00 18,217 551.0 0 0 18,217254.00 278,199 2,769.0 245,070 245,070 604,216255.00 320,265 3,088.0 298,985 544,056 752,926256.00 367,030 3,339.0 343,382 887,438 881,339


#1 Primary 254.00' Custom Weir/Orifice, C= 2.62Head (feet) 0.00 2.00Width (feet) 9.05 23.11

Primary OutFlow Max=36.90 cfs @ 13.69 hrs HW=254.97' TW=253.40' (Dynamic Tailwater)

1=Custom Weir/Orifice (Weir Controls 36.90 cfs @ 3.05 fps)

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