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BRIGGS

VP

W3

W4

W5

Drainage Diagram for 2608-EXISTING-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-EXISTING-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 = 278.310 ac, 13.82% Impervious, Inflow Depth = 3.48" for 100yr event

Inflow = 200.95 cfs @ 13.35 hrs, Volume= 80.698 afOutflow = 200.95 cfs @ 13.36 hrs, Volume= 80.698 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 = 154.55 cfs @ 12.57 hrs, Volume= 24.526 afOutflow = 87.96 cfs @ 13.04 hrs, Volume= 24.526 af, A tten= 43%, Lag= 28.3 minPrimary = 87.96 cfs @ 13.04 hrs, Volume= 24.526 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= 278.49' @ 13.04 hrs Surf.Area= 163,071 sf Storage= 431,587 cf (348,852 cf above start)

Plug-Flow detention time= 197.5 min calculated for 22.626 af (92% of inflow)Center-of-Mass det. time= 134.2 min ( 988.1 - 854.0 )

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=87.96 cfs @ 13.04 hrs HW=278.49' TW=276.52' (Dynamic Tailwater)1=Custom Weir/Orifice (Weir Controls 87.96 cfs @ 4.35 fps)

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Summary for Pond W3:


Inflow = 166.03 cfs @ 13.27 hrs, Volume= 62.149 afOutflow = 165.83 cfs @ 13.31 hrs, Volume= 62.149 af, Atten= 0%, Lag= 2.2 minPrimary = 165.83 cfs @ 13.31 hrs, Volume= 62.149 af

Routing by Sim-Route method w/Net Flows, Time Span= 0.00-850.00 hrs, dt= 0.01 hrsPeak Elev= 239.00' @ 13.31 hrs Surf.Area= 33,608 sf Storage= 16,239 cf

Plug-Flow detention time= 1.6 min calculated for 62.149 af (100% of inflow)Center-of-Mass det. time= 1.6 min ( 1,748.5 - 1,746.8 )




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=165.82 cfs @ 13.31 hrs HW=239.00' TW=0.00' (Dynamic Tailwater)

1=Custom Weir/Orifice (Weir Controls 165.82 cfs @ 3.21 fps)


Inflow Area = 9.150 ac, 14.64% Impervious, Inflow Depth = 4.62" for 100yr eventInflow = 25.09 cfs @ 12.50 hrs, Volume= 3.522 afOutflow = 25.05 cfs @ 12.53 hrs, Volume= 3.522 af, Atten= 0%, Lag= 1.4 minPrimary = 25.05 cfs @ 12.53 hrs, Volume= 3.522 af


Plug-Flow detention time= 3.8 min calculated for 3.522 af (100% of inflow)

Center-of-Mass det. time= 3.5 min ( 839.1 - 835.6 )




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=25.05 cfs @ 12.53 hrs HW=274.13' TW=254.04' (Dynamic Tailwater)1=Custom Weir/Orifice (Weir Controls 1.51 cfs @ 1.15 fps)2=Broad-Crested Rectangular Weir (Weir Controls 23.53 cfs @ 0.95 fps)


Inflow Area = 73.180 ac, 1.83% Impervious, Inflow Depth = 3.87" for 100yr eventInflow = 155.06 cfs @ 12.63 hrs, Volume= 23.603 af

Outflow = 37.47 cfs @ 13.69 hrs, Volume= 17.977 af, A tten= 76%, Lag= 63.6 minPrimary = 37.47 cfs @ 13.69 hrs, Volume= 17.977 af


Plug-Flow detention time= 343.4 min calculated for 17.977 af (76% of inflow)Center-of-Mass det. time= 257.4 min ( 1,115.7 - 858.2 )




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=37.47 cfs @ 13.69 hrs HW=254.98' TW=253.40' (Dynamic Tailwater)

1=Custom Weir/Orifice (Weir Controls 37.47 cfs @ 3.06 fps)

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