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M(vii) - 7 <br />• Rc-servoir =sediment Vr.~lumc: <br />Llse Llr~iversil :=soil Less Equatic~r~ (~I:=:LE) witr~ iri ipprc~priite L~r. <br />Ys = R X F:: X L_: X CP X Llr <br />Ys = Sediment Yield ( tens per acre per year 7 <br />R = Rainfall Factor <br />1~: _ ..:..il Er~~dit~ility Fact~~r <br />L=: = Li:r~gtri v:l ope Fact~~r <br />Dr = Delivery Ratio <br />The- rnethc~ds and references used here ire from "Applied Hydrology <br />ir~d :=:edirt~er~tology fc~r Gisturt~ed Areas" try Rarfi~_~ld, et il, 1'i~'.1; <br />e„cept where n~~ted. <br />=r.~lutic~r~: <br />R = ~i~ - Frort~: A ~~vide 1-or F'r~=dictir~g =oil Lo_ irk i~~~lc~radr_~, <br />Tecr~r~ical Nate 50, i_olorid~~ =~~i1 C~~r~servatic~r~ <br />~ervice, USDA - Figure 1, Five ~U. <br />E:: = U.1iJ - Fr„rt~ <br />witr~ <br />sell <br />rnis <br />• rt. i i r. <br />nort~ogriph Figure _. 1:?, Page =~'? <br />2U% silt and very fine s.arnj, ~0% sand, ~~% iiM, <br />structure 4 (blc~c4::y), ir~d a perrt~iibil ity c.f <br />l;~w "E::" is e::pected because tree waste- will be <br />iy rock: from the mine and corrtain few fines. <br />L_ _ '7.U - Frr~m Figure 5,15, Page ..4, with slc~pc- length ~~f y0' <br />grid a sl~~pe cif :H 1V. <br />CF' = 1,. - Fran, 7ible _.= F'ige _''=~1, fc~r bare soil c~~r~ditior~s <br />with compicted~t~y bulldozer and striped up• and down. <br />Dr = 0.7 - From F1QUre _.~", F'ige .55. <br />The total sediment delivered is then: <br />Ys (R)(1::)(LS)(CF')(Dr) _ (1G)(p.~rJ)('~.U)(1.30)(0.7) <br />Ys = 1/-•.~;:= Tors/Acre/Year - for '~./-~ acres yic-ld is 4~,/--. t~ar~s/year <br />The volume of sediment delivered is: <br />Vs = Ys ('~rJ00 lt./tc~ri) / 1.5 (L-•2.4 lb/cu-ft) _ <br />Vs (4~.h) ('~VUO) / (1.5) (I-r"4) (4^-:,SGO) <br />Vs = Sr0'~ cubic feet per year (U:_;E Vs = 'i~~U) <br />Designing the pr~nd for i three- year period will require a sediment <br />• capacity of " 7G0 cut~ic rect. <br />L-~/17/~_G <br />