2001-12-11_PERMIT FILE - C1996084

• Permit No: C1996084
• IBM Index Class Name: Permit File
• Doc Date: 12/11/2001
• Section_Exhibit Name: EXHIBIT 15-26 MINE AREA P7 SEDIMENT CONTROL POND 7-4
• Media Type: D
• Archive: No

SEDCAD 4 for Windows
Copyright 1998 Pamela J Schwab
Civil SoNware Design
Structure #3 (Pond
n. coal, slope
Pond Inputs:
Structure Detai/;
Initial Pool Elev: 6,640.00
Initial Pool: 4.01 ac-R
'Sediment Storage: 1.88 ac-ft
Dead Space: 20.00
*Sediment capacity based on Average Annual R of 70.0 for 2 year(s)
Emergency Spillway
Spillway Elev Crest Length Left Right Bottom
(R) Sideslope Sideslope Width (ft)
6,640.00 10.00 2.50:1 2.50:1 6.00
Pond Results:
•
Peak Elevation: 6,640.98
H'graph Detention Time: 2.44 hrs
Pond Model: CSTRS
Dewater Time: 1.35 days
Trap Efficiency: 93.06
Dewatering time is calculated from peak stage to lowest spillway
Elevation-Capacity-Discharge Table

Elevation Area

(ac) Capacity

(ac-R) Discharge

(~s) Dewater
Time
(hrs)
6,634.30 0.541 0.000 0.000 Top of Sed. Storage
6,634.50 0.552 0.111 0.000
6,635.00 0.576 0.394 0.000
6,635.50 0.606 0.690 0.000
6,636.00 0.634 LOOP 0.000
6,636.50 0.662 1.324 0.000
6,637.00 0.692 1.662 0.000
6,637.50 0.721 2.015 0.000
6,638.00 0.752 2.383 0.000
6,638.50 0.783 2.767 0.000
6,639.00 0.815 3.167 0.000
6,639.50 0.847 3.582 0.000
Filename: 25pond7-4rev.sc4 Printed 07-19-2001