2001-12-11_PERMIT FILE - C1996084 ‎(10)‎

• Permit No: C1996084
• IBM Index Class Name: Permit File
• Doc Date: 12/11/2001
• Section_Exhibit Name: Exhibit 15-16 Mine Area P2 SEDIMENT CONTROL POND 2-2
• Media Type: D
• Archive: No

SEDCAD 4 for Windows
Copyriyh~ t 998 Pamela J. Schwab
Civil Software Design
• Structure Detai/:
Structure #2 (Null)
East Ditch
Structure #1 (Null1
West Ditch
Structure #3 (Pond,)
Pond
Pond Inputs:
Initial Pool Elev: 6,638.50
Initial Pool: 0.40 ac-ft
"Sediment Storage: 7.93 ac-ft
Dead Space: 20.00
*Sediment capacity based on Average Annual R of 70.0 for 3 year(s)
Perforated Riser
•
Riser
Riser eight Barrel
el
Barre
I
Slope
a Number of
'
Diameter
() tt
°
°
Diameter Le B
th
g () ( ) Manning
s n Spillway Elev Holes per
(in) (in) Elev
8.00 8.00 6.00 100.00 5.00 0.0240 6,644.00 3
Pond Results:
Peak Elevation: 6,644.47
H'graph Detention Time: 16.41 hrs
Pond Model: CSTRS
Dewater Tme: 5.44 days
Trap Efficiency: 86.66

Dewatering time is calculated from peak stage to lowest spillway
Elevation-CapacitLDischarge Table

b'~

Elevation Area

(ac) Capacity

(ac-ft) Discharge

(ffs) Dewater
Tme
(hrs)
6,63 6 1.187 0.000 0.000 Top of Sed. Storage
6,638 .50 1.206 0.405 0.000 Low hole SPW #1
6,639 .00 1.235 1.015 0.223 33.14"
6,639. 50 1.264 1.640 0.315 23.99*
6,640. 00 1.293 2.279 0.609 12.71*
6,640. 50 1.323 2.933 0.761 10.40"
6,641. 00 1.353 3.602 0.940 8.61*
Filename: Pond 2-1 and 2 revised.srA Printed 04-17-2001