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 1998 Pamela J Schwab
Civil Software Design
w/o Freeboard w/ Freeboard
• Hydraulic Radius: 0.312
Froude Number: 1.40
Structure #5 (Pond)
mid. fill
Pond Inputs:
Initial Pool Elev: 6,735.00
Initial Pool: 0.55 ac-ft
'Sediment Storage: 5.82 ac-R
Dead Space: 20.00
*Sediment capacity based on Average Annual R of 70.0 for 3 year(s)
Perforated Riser
Riser Riser Height Barrel Barrel Barrel Slope Number of
'
Diameter (k) Diameter Length (k) (%) Manning
s n Spillway Elev Holes per
(in) (in) Eev
12.00 8.00 8.00 50.00 3.00 0.0240 6,737.00 ~ 4
• Emergency Spillway
Spillway Elev Crest Length Lek Right Bottom
(k) Sideslope Sideslope Width (R)
6,740.00 10.00 2.50:1 2.50:1 2.00
Pond Results:
Peak Elevation: 6,737.15
H'graph Detention Time: 13.79 hrs
Pond Model: CSTRS
Dewater Time: 3.32 days
Trap Efficiency: 93.21
Dewatering time is calculated from peak stage to lowest spillway
Elevation-Capacity-Discharge Table

Area Capacity Discharge Dewater ~~
Elevation Tme I
(ac) (ac-R) (~s) (hrs)
6,734.61 1.406 0.000 0.000 Top of Sed. Storage
6,735.00 1.431 0.546 0.000 Low hole SPW #1
6,735.50 1.464 1.272 0.297 29.48'
Filename: ponds-1.sc4 Printed 04-23-2001