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• <br />• <br />• <br />BOWIE NO. 1 MINE <br />POND #1, #2 and #3, #4 and WASTE AREA POND SiZiNG <br />STORM EVENTS <br />]0 YEAR 24 HOUR EVENT l.7 INCHES <br />The mnoff calculation pueaented below are calculateA based on the manual - Preceduta fm Determining <br />Peak Bows in Colorado • published by the Sail Cottaervation Servim dated Mateb 1984 <br />Dnirtage plate are shown on Map 8.4. <br />Iuniper Woodland Community <br />Affected Reference <br />Total Corer % 70.4 72.1 <br />Table 2-2d-Runoff curve nvmbm fm grid and smniarid rangelands <br />Cover Type - Pinyonyutuper, Juniper m both, gnas mtderslory <br />Hydrologic Candiliovr <br />Soil Type -Banton -Aqua &ia <br />Curve Number <br />Revegetated Area <br />The tevegetated arras are acme of the fill and cut slopm at the site. These <br />slopes cmwist of a mature of graa; weeds and low brush The cover <br />condition of the cover would be cmuideted fair 30% <br />Table 2-2d-Rwoff curve munhen fm and and semiarid rangelands <br />Cover Type -Herbaceous - mia4me of grass, weeds and low growing bnuh <br />Hydrologic Condition <br />Soil Type -Banton - Aqua tiia <br />Curve Number <br />Disturbed Atea <br />The disturbed area u made W of basically two cover types. <br />Thry ate; 1) coal pad and facilities and; 2) diR sloped <br />The coal pad and facilities are considered to be gavel surfaced. <br />Table 2-2a-Ruttoff curve number fm urban areas. <br />Cover Type - Gavel <br />Soil Type -Banton -Aqua frig <br />Curve Nunber <br />Cover Type -Dirt <br />Soil Type -Banton -Aqua fiia <br />Curve Number <br />Weighted Avenge curve muttber fm distrbed areas: <br />%Area Ctuve# Etdmtded <br />Dirt 50.0 89 44.5 <br />Gavel 50.0 87 d3.5 <br />Total 100.0 88.0 <br />Cave number 88 will be utilized far all of the disturbed areas. <br />Vol. 9A, Pgd 12 & 13 <br />Crcod <br />C <br />61 <br />Fav <br />C <br />81 <br />C <br />89 <br />C <br />87 <br />Weighted avenge curve # <br />I <br />