PERMFILE56724

• Permit No: C1994082
• IBM Index Class Name: Permit File
• Doc Date: 9/27/2007
• Doc Name: 10-Year, 24 Hour SEDCAD Demonstration
• Section_Exhibit Name: Tab 13 Attachment 13-3A.2 Addendum 13-3A-A
• Media Type: D
• Archive: No

YOAST MINE
Pond 10 -Watershed W-11
HYDROLOGIC INPUT PARAMETERS
SEDCAD 4
WATERSHED ID
Structure 2 - SWS1
Watershed W-11 (YPM-11)
Watershed Area:
343.6
Curve Number:
VEGETATION HYDROLOGIC CURVE AREA
WATERSHED TYPE COVER SOIL GROUP NUMBER acres
Aspen/Mountain Brush Good (>70%) B 30 98.07
Aspen/Mountain Brush Good (>70%) C 41 141.95
Mesic Drainage Fair (30%<x<70%) C 81 8.08
Rock Outcrop Bare D 98 0.62
Sagebrush Good (>70%) C 47 15.57
Reclaimed Fair (30%ax<70%) B 71 31.37
Spoil Bare C 86 47.97
Total 343.6
CURVE NUMBER 48
'• Curve number {CN) values used are approved Yoast Mine values (see Table 13-12.1). Values were
adapted from Urban Hydrology for Small Watersheds, Technical Release No. 55 (TR-55) ,Soil Conservation
Service, 1986.
•
SEDCAD 4
WATERSHED ID
Structure 2 - SWS1
Watershed W-11 (YPM-11)
Watershed Area:
343.6
Sedimentology
k Factor and Control Factor:
VEGETATION HYDROLOGIC k CONTROL AREA
WATERSHED TYPE COVER SOIL GROUP FACTOR FACTOR acres
Aspen/Mountain Brush Good (>70%) B 0.28 0.042 98.07
Aspen/Mountain Brush Good (>70%) C 0.37 0.042 141.95
Mesic Drainage Fair (30°h<x<70%) C 0.28 0.100 8.08
Rock Outcrop Bare D 0.10 1.0 0.62
Sagebrush Good (>70%) C 0.37 0.042 15.57
Reclaimed Fair (30%<x<70%) B 0.16 0.043 31.37
Spoil Bare C 0.16 1.0 47.97
Total 343.6
0.29 0.18
TR-35 13-3A-A.21 Revised OB/07