2001-12-11_PERMIT FILE - C1996084 ‎(4)‎

• Permit No: C1996084
• IBM Index Class Name: Permit File
• Doc Date: 12/11/2001
• Section_Exhibit Name: EXHIBIT 15-23 MINE AREA P7 SEDIMENT CONTROL POND 7-1
• Media Type: D
• Archive: No

SEDCAD 4 for Windows
Copyright 1998 Pamela J. Schwab
Gvil Software Design
2
w/o Freeboard w/ Freeboard
• Hydraulic Radius: 0.331
Froude Number: 1.12
Structure #3 (Null
mid. slope, mid. coal
Structure #4 (Pond
south sws, east sws
Pond Inputs:
Initial Pool Elev: 6,691.00
Initial Pool: 4.01 ac-ft
'Sediment Storage: 0.85 ac-ft
Dead Space: 20.00
*Sediment capacity based on A ve2ge Annual R of 70.0 for 1 year(s)
Perforated Riser
r
L
Riser Riser Height Barrel Barrel Barrel Slope Number of
'
Diameter (ft) Diameter Length (ft) (%) Manning
s n Spillway Elev Holes per
(i }~- (in .- Elev
12.00 8.00 8.00 100.00 3.00 0.0240 6,694.00 4
Pond Results:
Peak Elevation: 6,694.78
H'graph Detention Time: 12.09 hrs
Pond Madel: CSTRS
Dewater Tme: 5.96 days
Trap Efficiency: 92.26
Dewatering time is calculated from peak stage to lowest spillway
Elevation-Caoacity-Discharge Table

Elevation Area

lac) Capacity

(ac-ft) Discharge

(~s) Dewater
Tme
(hrs)
6,686.11 0.772 0.000 0.000 Top of Sed. Storage
6,686.50 0.779 0.299 0.000
6,687.00 0.789 0.691 0.000
6,687.50 0.799 1.088 0.000
6,688.00 0.809 1.990 0.000
6,688.50 0.619 1.897 0.000
Filename: pond?-1 rev.sc4 Printed 07-26-2001