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<br />. <br /> <br />. <br /> <br />. <br /> <br />n!,;nQ <br />Que'!;'t1O'n 2: <br /> <br />WILL RIVER LOSSES OF SUPPLEMENTAL WATER DOWNSTREAM OF NARROWS AVERAGE 20%7 <br /> <br />Answer 2: <br /> <br />No. River losses will more likely average approximately 12 percent. Quoted <br />below is an excerpt from one of our letter reports prepared in 1972. <br /> <br />"The transit losses resulting from releases from the Narrows Dam can be catego- <br />rized under the general headings of evaporation, bank storage, and unauthorized <br />diversions. The demands for supplemental water are expected to be the largest <br />in August and September and could amount to an incremental flow of 500 to 800 cfs <br />on top of an average natural flow of approximately 300 cfs. In a reach of about <br />100 miles downstream of the Narrows Dam, the transit losses consisting of two <br />percent for evaporation, six percent attributable to bank storage, and four per- <br />cent for unauthorized diversions, would amount to 12 percent." <br /> <br />River losses are largest due to bank storage. Such losses are not really losses <br />in the usual sense because it is a form of aquifer recharge which has local and <br />regional benefits. <br /> <br />During certain periods, the losses will exceed 12 percent due to aqufier draw- <br />down due to extensive pumping. During these periods, it is anticipated that water <br />will be released in slugs which would be in addition to the fish release. Addi- <br />tional aquifer management techniques would be employed. <br /> <br />References: <br /> <br />I. Letter Report to Lower South Platte Conservancy District Narrows Dam <br />Releases, Incremental River Losses, Wright Water Engineers, Inc., <br />April 28, 1972. <br />