PERMFILE111188

• Permit No: C1982057
• IBM Index Class Name: Permit File
• Doc Date: 12/11/2001
• Doc Name: DESIGN AND STABILITY REPORTS FOR POND 005 AND HAUL ROAD G
• Section_Exhibit Name: TAB 13 ATTACHMENT 13-3
• Media Type: D
• Archive: No

TABLE 13-3-10
Weighted CP Factor
Pond 005 - Sus-3
a
Vegetation Type
CP
Area (ac.)
Mixed Brush 0.003 16.5
Sagebrush 0.003 2.5
Western Wheatgrass 0.006 0.8
Steep Mountain Brush 0.006 0.8
Haul Road 0.500 11_1
Total 31.7
Weighted Average LP = 5.618 = 0.177
31.7
C~
•
CP x Area
0.050
0.008
0.005
0.005
5.550
5.618
Storage Lapacity
r
The storage capacity was also analyzed using the SEDCAD computer program. Results of the
SEDCAO model show the storm runoff volume from the 10-year, 24-hour precipitation event
to be 4.64 ac-f t. The po nding area is designed [o store 5.8 ac-ft of sediment. There
will be no discharge through the emergency spillway during the 10-year, 24-hour storm
event. In addition, [here will be adequate freeboard from the emergency spillway to the
[op of embankment during the 100-year, 24-hour storm event. Table 13-3-11 is a summary of
the designed storage capacity.
TABLE 13-3-11
Preliminary Design Storage Capacity Summary
Pond 005
Capacity
Elevation Stage (AC.-Ft.) Description
6855.0 0 0.00
6872.1 17.1 5.8
6873.0 18.0 6.5
6874.0 19.0 7.4
6875.2 20.2 8.5
6875.6 20.6 8.8
6880.0 25.0 13.8
Bottom of Pond Excavation
t00X Sediment Storage, and
Elevation of Principal Spillway
10-Yr, 24-Hr. Peak Stage
Crest of Emergency Spillway
25 -Yr., 24-Hr. Peak Stage
100-Yr., 24-Hr. Peak Stage
iop of Embankment
13-3-11 Revised 03/13/92