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
Copynght 1998 Pamela J. Schwab
Civil Software Design
w/o Freeboard w/ Freeboard
• Froude Number: 1.96
Structure #3 (Pond)
n. coal, slope
Pond Inputs:
Initial Pool Elev: 6,636.00
Initial Pool: 0.73 ack
'Sediment Storage: 2.15 ac-k
Dead Space: 20.00
*Sediment capacity based on Average Annual R of70.0 for 2 year(s)
Perforated Riser
Riser Riser Height Barrel Barrel Barrel Slope Number of
'
Diameter (ft) Diameter Length (k) (%) Manning
s n Spillway Elev Holes per
(in) (in) Elev
12.00 6.00 8.00 80.00 3.00 0.0240 6,638.00 4
Emergency Spillway
• Spillway Elev Crest Length Lek Right Bolcom
(k) Sideslope Sideslope width (k)
6,640.00 10.00 2.50:1 2.50:1 2.00
Pond Results:
Peak Elevation: 6,638.17
H'graph Detention Tme: 12.42 hrs
Pond Model: CSTRS
Dewater Time: 5.93 days
Trap Efficiency: 94.77
Dewatering time is calculated from peak stage to lowest spillway
Elevation-Capacity-Discharge Table
•
Area Capacity Discharge Dewater
Elevation Time
(ac) (ac-k) (~s) (hrs)
6,634.79 0.567 0.000 0.000 Top of Sed. Storage
6,635.00 0.578 0.122 0.000
6,635.50 0.606 0.418 0.000
6,636.00 0.634 0.728 0.000 Low hole SPW #1
Filename: pond?-4.sc4 printed 04-24-2001