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<br />." <br />/",-"" <br />.,C <br /> <br />. <br /> <br />. <br /> <br />M4 {t <br />4//1 J-. J <br /> <br />COLORADO WATER CONSERVATION BOARD <br />ENGINEERING DEPARTMENT <br />215 State Services Building <br />1525 Sherman Street <br />Denver 3, Colorado <br /> <br />February, 1963 <br /> <br />IRRIGATION EXCHANGE POTENTIAL <br />ON <br />SOUTH PLATTE RIVER <br /> <br />INTRODUCTION <br /> <br />One of the factors involved in the selection of alternate <br /> <br />reservoir sites on the South Platte River is the potential opportun- <br /> <br />ity at any site to satisfy demands of ditches below the reservoir <br /> <br />site, which, under their senior priorities, may call water past <br /> <br />ditches with junior priorities upstream from the reservoir site. <br /> <br />The general theory of exchange is that releases may be made from a <br /> <br />reservoir to the downstream ditch in exchange for an equivalent <br /> <br />diversion from the river by the upstream ditch, provided that the <br /> <br />upstream diversion can be made without disturbing the diversions <br /> <br />being currently made by ditches between the upstream ditch and the <br /> <br />reservoir under their respective senior priorities. <br /> <br />The administration of water rights on the South Platte is <br /> <br />an extremely complex operation, depending on stream flows at the <br /> <br />gaging stations on the river and the occurrence of return flows and <br /> <br />tributary inflows between gages. Any estimate of exchange potential <br />