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Vegetative Cover % 43.3 <br />~) Litter % 24.0 <br />Ground Cover % 67.3 Table 4.8-13 <br />Cover Type -Pinyon Juniper <br />Hydrologic Condition Fair <br />Soil Type - Torriorthents/Rentsac, PAP page 4-81 C <br />Curve Number 73 <br />Table 2-2d-Runoff curve numbers for arid and semiarid rangelands <br />Refuse Pile Pond <br />RUN-OFF VOLUME - -Refuse Pile <br />Area <br />10-Year <br />Precip Direct <br />Acres Curve # Amount Run-off <br />Run-0ff <br />Vol A-F <br />Disturbed 2.26 80 1.5 0.29 0.05 <br />Upland 14.10 73 1.5 0.13 0.15 <br />TOTAL 16.36 0.21 <br />TOTAL REQUIRED WATER VOLUME - - A-F 0.21 <br />SEDIMENT VOLUME -Refuse Pond <br />Use the universal soil loss equation. <br />A=RKLSCP <br />R =rainfall factor 30.00 <br />K =soil erodibility factor -sandy loam 0.37 <br />LS =combined length slope factor 900 - 2% 0.39 <br />C =cropping management factor -Figure 7 1.00 <br />P =erosion control practice factor 1.00 <br />A =sediment, tons/acre/year 4.33 <br />Three YEAR SEDIMENT VOLUME - A-F 0.08 <br />16.36 ACRES - 115 #/CF <br />TOTAL REQUIRED CAPACITY -- Acre-Feet -Refuse Pond 0.29 <br />I~ <br />TR-22 M(vii)-28 03/07 <br />