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<br />001023 <br /> <br />.' <br /> <br />Assuming o.n nvera[;e Dry Creek ra'.nfo.ll runoff of one thousand <br />c.cre-foet per yeo.r (46 ncre-feot per square ni Ie) wi '011 D. nu>.""imun silt <br />content of ono percent by vol~~o, the resorvoir silt inflow would be <br />500 o.Cl'e-feet in 5Q. year's of opcrD.tion., Guernsey Reservoir has 8'10wn <br />an o.vorr\gc sodiracnt ~ccu1ilulc'.tion of 1,233 [tcre..fcet D. ycc.r, with n <br />nc~ annuo.l inflow of 235,000 ncre-feet fron the silt contributing o.rea, <br />i. Os, bclorJ Alcovo.. Dm7i. <br /> <br />S)mu1d Guernsey Roservoir sto.l~ passing silt, tho r:J.to of silto.- <br />tion of Braziel Rcsor-voir v.:ould be considera.bly increo.scdC) For cxo.!nple, <br />if 0.11 the Guernsoy silt inflow rlere pr,ssod, it is estirno.ted the out- <br />flow would conto.in r.bont 0011 percent silt by volume. This concentrfl- <br />tion of silt in Ft. w:'CJ:1ie Go.no.lrmter 0.'0 Ali1e 88.3 VI:J.stOWD.Y would <br />incroo.se tho 50 yeo.r silt inflow of Braziel Resorvoir by 470 acre-foot, <br />'-,l\king c. totD.l of 970 ncro-feet in 50 yoc,rs. Si.nco Guernsoy Resen'oir <br />will probo.bly bo supp1e~entod by a n~w main stem reservoir be foro its <br />capo.city is roducod to such o.n extont thut it pc.sses nost of its silt <br />inflow, the 50 YOD.r siltation of Braziel Reservoir fron this Source <br />would probo.bly be much less thnn 470 acre-foet. <br /> <br />f..n allo\"lD.ncG of 750 acro-fect total is a110ned in this study for <br />silt acccunu1ation, <br /> <br />. Oi'e':2.!~ <br /> <br />The reservoir operation for the period 1933-1946 is shm-JI1. in To.ble <br />13., InflorJs to tho reservoir frOJ:1 Dry Creek and canul Wo.stos ure toleen. <br />from Tab10 7. TctD.l deF.Dnds on tho rosorvoir urc tc~on fron To.b1e 10, <br />Resorvoir evo.poration losses nro eonputed frem dnta givon in To.blo 12, <br />Since historic f10~s nctu~11y dolivored o.ro used ~s 'one bnsie for tho <br />dc)Uand, no shortr.gos o.ro shovm inusnuch ns tho h'.nds ur.der tho roservoir <br />would still retain thoir rigilts to direct flow fro", the Ft, Lo.ro.nie <br />Canc.1, and receive their o qui table portion of tho project supply. 1:1 <br />addition to tho roservoir inflow shoun.in Tub1e 7, fiGures o.ro ~lso <br />s!10rm in the oporo.tion study for the anount of vle.ter requirod fron tlm <br />Ft. Lnr=io C=o.l to givo tho lo.nds thc snF..o nmo"nt of viator they <br />recei ved in t:lO pD.st. To D.chiovo tho nost benofit fron construction <br />o~ the resorvoir, the opcro.tion studies TIora conductod so ~s to have <br />0. "i!li::\'.>r'. of 6.5 thouso.nd ".cre-foct in storagc in Braziel en J1J...'1e 30, <br />tro.nsferring Po.thfindor store'bo dO\"lnstr(;c.J~ to re~ch 'ollis figuro if <br />necossary, vlhon the supply rondo such nction practic0.1. Tho I.:c.y 31 <br />P~thfinder storngc ,'ms less tn.'1n 350,000 c.cre-foet in 1934, 1935, ""d <br />19'10, indic~ting " shol'to.sc of supply for tho North P1Qtte Projeet. <br />Consequently, during theso yeo.rs ne trc.nsfer of stor~ge fron Pc..thfindor <br />to Bro.ziol was nado, sinco such ~ction ~ou1d ~"ount to X1 1J...'1uqu::'.1 <br />distribution of the av,,-nab10 projoct supply, <br /> <br />EX~libi-t 3 illustrl.l."t;cfi t,~1a r..-;sorvoir 0~l)r['.tion ;r:;.ph.i.cn..lly. <br /> <br />.1 <br /> <br />34 <br />