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<br />Expansion of Existing <br />Facilities <br />(Alternative I-D) <br /> <br />The expansion of Chatfield Reservoir <br />to develop upstream mainstem flow <br />was considered in order to illustrate <br />water resources development under <br />this alternative. Assuming the reser- <br />voir Was expanded, an estimated <br />30,800 acre-feet could be delivered <br />for municipal use. <br /> <br />Supply <br /> <br />The average dependable municipal <br />water supply provided by the design <br />project would be 30,800 acre-feet. <br />The return flows from the municipal <br />use of the additional water would be <br />20,600 acre-feet annually. Agricul- <br />tural reuse of return flows four times <br />downstream would provide an addi- <br />tional 5,150 acre-feet of irrigation <br />water deliveries. <br /> <br />Costs <br /> <br />The 1980 cost estimate for construc- <br />tion of the design project is $106 <br />million. The interest cost during con. <br />struction would be $44 million. The <br />aaditional annual costs have not been <br />estimated because the facilities in <br />question are now heing operated and <br />maintained. <br /> <br />Impacts <br /> <br />The estimated investment required <br />would be a total of $150 million in <br />construction costs and interest dring <br />construction. Net economic benefit <br />would be about -$41 million. <br /> <br />The projected impacts on wildlife <br />and fisheries would represent a mod- <br />erate positive change from present <br />conditions. <br /> <br />~ <br /> <br />t~ <br />"'~.:.~ \. <br />:~~~lt~REY MO N(~I~) \ <br />-. .' '. '\.. ' )" ~ <br />._7 / HORSETOOTH~"'o"".fORT CjLLIN;, W E.:) L <br />. RES..... - . h~+ <br />(~) \ (ll D) .'\ - '.~,r\ qACTUS HJ4~~(II B) <br />......"'", HORSET OTH '.1 ~/;~ .-4-* <br />~ ... ,\" BOYD -,': r,~ <br />"-. -----... ~~'" Fitv n/}Ll.KE ".- "'-.J\;;I ( <br />'. ~ ..'-/'V...~ "'1J . ..,~ t <br />"'",'-) ll!!.' ~, .~,~ N(lGREL_EY.,-/'", RIVERSIDE <br />--- C 1= .' .. ~ES. <br />. LAKE CARTH " .' '. <br />'. .., f<ES. Ell ../ . ~ <br />I \...~.~~ "'~ Fil" ..' .J HARD! N '" -..' <br />---:'-"'_'-- "0. P~.., vol:{{...~: EMPIRE <:: <br />~.:!.r:y~~..c~'i2. . \..r ~ M~:~NO ~/ RES. <br />.: ~E-AG)~t-F1N.:r.OF? :q~ ~.: '."t. ,,<::'1 <br />1.~~5.([] . :L0NG~~ ". ANYON \: t <br />--"~ L Q.~R0S ) (:IT A) :~ 11I\ <br /><"". ......-;'0,;.' ~ '(" <br />......~o " :' BOULDEH .,r---" ~ <br />, <- - ... '" <br />~E"'~' ...---. /' . <br /> <br />DEVELOPMENT <br />OF MOUNTAIN <br />TRIBUTARY <br />FLOWS <br />LARIMER <br /> <br />4 <br /> <br />( <br />\ <br /> <br />:~.' <br /> <br />o <br /> <br />\ Pf<OSPECT <br />f. , ~ES. <br />. if)- - <br /> <br />) <br />. <br /> <br />- . <br />