2010-11-19_PERMIT FILE - C1980007 ‎(34)‎

• Permit No: C1980007
• IBM Index Class Name: Permit File
• Doc Date: 11/19/2010
• Doc Name: 10 yr - 24 hr, 25 yr - 24 hr
• Section_Exhibit Name: Exhibit 66 NSSA Pond
• Media Type: D
• Archive: No

SEDCAD 4 for Windows
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NSSA Pond
Pond Inputs:
Initial Pool Elev:
6,075.40 ft
Initial Pool:
0.17 ac -ft
*Sediment Storage:
0.01 ac -ft
Dead Space:
20.00%
*Sediment capacity based on A verage Annual R of 20.0 for 2 year(s)
Straight Pipe
Barrel Barrel
6,076.24 ft
Entrance Tailwater
Barrel
Manning's Spillway
CSTRS
Diameter Length
0.81 days
Loss Depth
Slope ( %)
n Elev (ft)
Top of Sed. Storage
(in) (ft)
0.090
Coefficient (ft)
6.00 35.00 10.00
0.0110 6,075.40
0.50 0.00
Emeraencv SDillwa
Spillway Elev Crest Length Left Right Bottom
(ft) Sideslope Sideslope Width (ft)
6,076.70 15.00 2.50:1 2.50:1 5.00
Pond Results:
Peak Elevation:
6,076.24 ft
Kgraph Detention Time:
2.10 hrs
Pond Model:
CSTRS
Dewater Time:
0.81 days
Trap Efficiency:
70.05%
Dewatering time is calculated from peak stage to lowest spillway
Elevation - Capacity - Discharge Table
Elevation
Area
(ac)
Capacity
(ac -ft)
Discharge
(cfs)
Dewater
Time
(hrs)
6,073.56
0.033
0.000
0.000
Top of Sed. Storage
6,074.00
0.090
0.026
0.000
6,074.50
0.100
0.074
0.000
6,075.00
0.110
0.126
0.000
6,075.40
0.118
0.172
0.000
Spillway #1
6,075.50
0.120
0.184
0.048
6.80
6,076.00
0.130
0.246
0.470
10.90
6,076.24
0.135
0.278
0.629
1.80
Peak Stage
6,076.50
0.140
0.314
0.804
6,076.70
0.148
0.342
0.916
Spillway #2
Filename: NSSA.sc4 Printed 10 -21 -2008
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