2008-12-11_PERMIT FILE - C1980007A ‎(32)‎

• Permit No: C1980007A
• IBM Index Class Name: Permit File
• Doc Date: 12/11/2008
• Doc Name: 25 Year, 24 Hour Surface Water Control Plan
• Section_Exhibit Name: Exhibit 66 SG-1 Pond
• Media Type: D
• Archive: Yes

SEDCAD 4 for Windows
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47
*Sediment capacity based on Average Annual R of 20.0 for 3 year(s)
9 Perforated Riser
Riser Barrel Number of
Riser Height Barrel Barrel Slope Spillway Elev
Diameter (ft) Diameter Length (ft) (%) Manning's n (ft) Holes per
(in) (in) Elev
6.00 9,001 6.00 180.00 2.001 0.0160 6,774.00
Emeraencv SDillwa
Spillway Elev Crest Length Left Right Bottom
(ft) Sideslope Sideslope Width (ft)
6,774.00 20.00 2.50:1 2.50:1 10.00
Pond Results:
Peak Elevation: 6,773.14 ft
H'graph Detention Time: 14.13 hrs
Pond Model: CSTRS
Dewater Time: 3.63 days
Trap Efficiency: 75.02%
Dewatenng time is calculated from peak stage to lowest spillway
11
•
Elevation-CapacitL-Discharge Table

Elevation Area

(ac) Capacity

(ac-ft) Discharge

(cfs) Dewater
Time
(hrs)
6,765.19 0.096 0.000 0.000 Top of Sed. Storage
6,765.50 0.106 0.031 0.000
6,766.00 0.122 0.088 0.000
6,766.50 0.140 0.154 0.000
6,766.73 0.150 0.187 0.000
6,767.00 0.162 0.229 0.000
6,767.50 0.185 0.316 0.000
6,768.00 0.210 0.415 0.000 Low hole SPW #1
6,768.50 0.236 0.526 0.074 18.16*
6,769.00 0.264 0.651 0.105 14.39*
6,769.28 0.280 0.727 0.119 7.75*
6,769.50 0.290 0.790 0.129 5.90*
6,770.00 0.320 0.943 0.223 8.28*
6,770.50 0.335 1.106 0.345 5.73*
6,771.00 0.350 1.277 0.416 5.50
6,771.50 0.370 1.457 0.548 4.50
6,772.00 0.390 1.647 0.630 3.95
6,772.50 0.410 1.847 0.700 3.60
Filename: SG-1.sc4 Printed 10-28-2008