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Larry Routten and Erica Crosby -5- November 3, 1993 <br />,. <br />WCR -Wetmore-Burido (126) .. . <br />40% Wetmore Hydrologic Soil Group D <br />30% Bundo Hydrologic Soil Group B <br />5°,6 Lakehelen Very Stony Fine Sandy Loam Hydrologic Soil Group C <br />5°,6 Tecolote Very Gravelly Sandy Loam Hydrologic Soil Group B <br />20°,6 Rock Outcrop Hydrologic Soil Group D <br />Acreage within Basin - 60 <br />Percent Area of Basin - 13°h <br />The soil association is 60°~ D, 35°h B, 5°b C; the D Group is used to be conservative. <br />Curve Number <br />The curve number used for the West Pit diversion design was derived from the Tables 2-2c and <br />2-2d (pages 2-7 and 2-8) (U.S. Department of Agriculture, 1986) (Exhibit B), and is an area- <br />weighted average curve number. The number used was 72 and was derived as follows: <br />Grassland ....:::::.:::: ::. <br />Cover Type Hydrologic Condition Soil Group <br />Herbaceous Fair 130°~ to 70°~ cover) B <br />Curve Number = 71 <br />(Percent Area Represented = 28°hl <br />... ... Woodland <br />Cover Type Hydrologic Condition Soil Group <br />Woods Fair C <br />Curve Number = 73 <br />(Percent Area Represented = 72°,6) <br />Thus, (71)10.28) +(73)(0.72) = 19.88 + 52.56 = 72.44; rounded to nearest tenth = 72. <br />