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<br />10 <br /> <br />River (a trIbutary of the Colorado River On the Western Slope) Insofar as <br />said city Is able to Identify and measure the quantIty of use or return <br />flows from such use ..,. to the end that Interests of vested rights .... are <br />not impa I red". <br /> <br />The amount diverted by Denver from the Fraser and WillIams Fork River basins <br />In the 1955 water year, amounting to 47,300 acre-feet,' Is excluded'from'rhe <br />re-use requirement of the Federal degree. Denver can re-use part of the <br />transmountaln return flows effectively wIthout any additional cost for faci- <br />lities through the simple procedure of exchanging identifiable transmountain <br />return flow for an equivalent amount of water upstream. This exchange can <br />only be made at times when there is flow In the South Platte River at the <br />point of diversion or storage wnicn would otherwise be passed to supply a <br />call downstream from the point of introduction of transmountain return flow. <br />Studies IndIcate that exchange could average as much as 45,000 acre-feet <br />per year, contrasted to potential total transmountain diversions from the <br />Fraser, WillIams Fork and Blue RIver basins of about 270,000 acre-feet per <br />year .,', <br /> <br />The Denver Water Board Is working on plans for the storage and treatement <br />of the remainder of its identifiable transmountaln return flow for success,ive <br />uses. Englewood, Aurora or any other metropolitan city having transmountain <br />water may do likewise. <br /> <br />* Hetropolltan Water Study Inventory. Report by Tipton and Kalmbach, Inc. <br />and W. W. Wheeler and AssocIates for ICRPC. <br />