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<br />fJJJ213 <br /> <br />. <br /> <br />Kinnikinick Af'terbay and Dam <br /> <br />This 1'eat1lI'e would function as an a:rterbay to regulate the <br />fluctuating power releases :passing through Idylwil.de Powerpla.nt. <br />The concrete ogee-type overflow dam would have a crest length of <br />300 feet and a height above stream bed of 55 feet. The ca:pacity of <br />the reservoir would be about 1,DOO acre~feet. <br /> <br />Rustic Diversion Dam <br /> <br />Releases from Kinn:l.kinick Af'terbay with a minimum of fluctu- <br />ation would flow downstream approximately eight mil.es to the Rustic <br />Diversion Dam. This structure would serve to divert water from the <br />stream channel into Elkhorn Conduit. Rustic Diversion Dam would <br />have an ogee crest at about elevation 6,930, 15 feet above the <br />:present stream bed; a river outlet through a sluice lY>te, a down- <br />stream river gage and headworks wi"th measuring device for the <br />Elkhorn Conduit. An earth wing dike is required on the right <br />abutment. <br /> <br />Elkhorn Conduit <br /> <br />This struct1lI'e would convey wa"ter from Rustic Diversion Dam <br />to Cache ]a Poudre Forebay, It would consist of wo free-flow <br />. tunnel secUons each 4-1/2 :miles long, separated by a short siphon <br />across Elkhorn Creek; a 9,000-foot long cu"t and cover section; and <br />a 4,700-foot long high-head siphon across Hewle"t"t Gulch. The conduit <br />would have a maximum capa.ci"ty of 300 cfs with an average operation of <br />- . - - . - - - - about- 250- CfB. _ }I9~El. ci~t_ailed studies may indicate tha"t a ell version <br />dam to divert flows :from Elliliorn -Creek 'would- be. feasible. <br /> <br />Cache 1.a. Poudre Forebay and Dam <br /> <br />The site of the proposed forebay is about 15 airline miles <br />northwest 01' Fort Collins, Colorado. It is about 2 miles north <br />and over 1,000 feet above "Columbine," a community situated in the <br />Poudre River Cany-on. The dam structure would be earth and rock- <br />fill, having a crest length of approximately 750 feet and height <br />above stream bed of 150 feet. A dike 70 feet in height with a <br />crest length of ll-50 feet situated northwest of the main dam would <br />also be required. The crest elevation of both the dam and dike <br />would be 6,810 feet. Spillway requirements are small and will be <br />afforded from the inlet canaJ.. <br /> <br />The forebay would have an active capacity of 4,600 acre-feet. <br />Dead storage space 110uld be about 800 acre-feet. The normal water <br />surface area is 95 acres and minilllum water surface area is 30 acres. <br /> <br />. <br /> <br />6 <br />