2001-12-11_PERMIT FILE - C1996084 ‎(6)‎

• Permit No: C1996084
• IBM Index Class Name: Permit File
• Doc Date: 12/11/2001
• Section_Exhibit Name: EXHIBIT 15-21 MINE AREA P5 SEDIMENT CONTROL POND 5-1
• Media Type: D
• Archive: No

SEDCAD 4 for Windows
Copyright t99e Pamela J. Schwab
Civil Software Design
•
w/o Freeboard w/ Freeboard
Design Discharge: 38.92 ds
Depth: 0.38 ft 1.38 ft
Top Width: 21.90 ft 26.90 ft
Velocity: 4.90 fps
7C-Section Area: 7.94 sq ft
Hydraulic Radius: 0.360
Froude Number: 1.43
Structure #S (Pond)
mid. fill
Pond Inputs:
Initial Pool Elev: 6,740.00
Initial Pool: 9.28 ac-ft
'Sediment Storage: 5.10 ac-ft
Dead Space: 20.00
'Sediment capacity based on Average Annual R of 70.0 for 3 year(s)
Emergency Soillway
• Spillway Elev Crest Length Left Right Bottom
(ft) Sideslope Sideslope Width (ft)
6,740.00 10.00 2.50:1 2.50:1 16.00
Pond Results:
Peak Elevation: 6,740.99
H'graph Detention Tme: 2.00 hrs
Pond Model: CSTRS
Dewater Tme: 1.28 days
Trap Efficiency: 92.68
Dewatering time is calculated from peak stage to lowest spillway
Elevation-Caoacit~Discharge Table
•
Area Capacity Discharge Dewater
Elevation Time
(ac) (ac-ft) (~s) (hrs)
6,734.10 1.372 0.000 0.000 Top of Sed. Storage
6,734.50 1.398 0.560 0.000
6,735.00 1.431 1.267 0.000
6,735.50 1.464 1.991 0.000
6,736.00 1.498 2.731 0.000
Filename: 26pond6-1rev.sc4 Primed 08-27-2001