PERMFILE117877

• Permit No: C1981020A
• IBM Index Class Name: Permit File
• Doc Date: 3/19/2004
• Section_Exhibit Name: Appendix M‎(vii)‎ to M‎(viii)‎ Hydrologic Data
• Media Type: D
• Archive: Yes

• Upland Area
Cover
Juniper Woodland affected area
Vegetative Cover % 43.3
Litter % 24.0
Ground Cover % 67.3 Table 4.8-13
Cover Type -Pinyon Juniper
Hydrologic Condition Fair
Soil Type - Torriorthents/Rentsac, PAP page 4-81 C
Curve Number 73
Table 2-2d-Runoff curve numbers for arid and semiarid rangelands
Refuse Pile Pond
RUN-OFF VOLUME - -Refuse Pile 10-Year
Precip Direct Run-off
Area Acres Curve # Amount Run-off Vol A-F
Disturbed 2.30 80 1.5 0.29 0.05
Refuse 2.60 89 1.5 0.63 0.14
• Upland 11.50 73 1.5 0.13 0.12
TOTAL 16.40 0.32
TOTAL REQUIRED WATER VOLUME - - A-F 0.32
SEDIMENT VOLUME -Refuse Pond
Use the universal soil loss equation.
A=RKLSCP "
R =rainfall factor 30.00
K =soil erodibility factor -sandy loam 0.37
LS =combined length slope factor 900 - 2% 0.39
C =cropping management factor -Figure 7 1.00
P =erosion control practice factor 1.00
A =sediment, tons/acre/year 4.33
Three YEAR SEDIMENT VOLUME - A-F 0.09
16.40 ACRES - 115 #/CF
TOTAL REQUIRED CAPACITY -- Acre-Feet -Refuse Pond 0.41
•
M" M(vii)-3 9/02