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
Cnnv.inhr 10OR -9M7 D -1. I Qrh,..h
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w/o Freeboard w/ Freeboard
Hydraulic Radius: 0.293 ft
Froude Number: 0.92
Structure #1 (Pond,
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
6,075.91 ft
H'graph Detention Time:
Entrance Tailwater
Pond Model:
Barrel Manning's
Spillway
0.78 days
Diameter Length
78.30%
0.000
Loss Depth
6,074.00 0.090
Slope ( %) n
Elev (ft)
(in) (ft)
Coefficient (ft)
6.00 35.00
10.00 j 0.0110
6,075.401
0.50 0.00
Emergency Spillway
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:
6,075.91 ft
H'graph Detention Time:
2.20 hrs
Pond Model:
CSTRS
Dewater Time:
0.78 days
Trap Efficiency:
78.30%
Dewatenng time is calculated from peak stage to lowest spillway
Elevation - Capacity - Discharge Table
Area
Capacity
Discharge Dewater
Elevation
Time
(ac)
(ac -ft)
(cfs) (hrs)
6,073.55 0.031
0.000
0.000 Top of Sed. Storage
6,074.00 0.090
0.026
0.000
Filename: NSSA.sc4 Printed 10 -16 -2008