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<br />0"'0" <br />.):;~ <br /> <br />INTRODUCTION <br /> <br />The proposed Narrows Reservoir is a U.S. Bureau of Reclamation <br /> <br />project to create a multipurpose reservoir in the South Platte River <br /> <br />I <br />FIG, I <br />I ~'DN~ <br />IOCllr here), <br />I <br /> <br />basin. The reservoir ~ill be formed behind the dam to be constructed at <br />.. <br /> <br />Narrows, west of Fort Morgan, Morgan County, Colo. (fig. 1). The reser- <br /> <br />voir will have a maximum capacity of 1,548,558 acre-ft (1.91 billion m3) <br />2 ' <br />and inundate a total of 39,628 acres (160 million m ) including pasture, <br /> <br />river lowlands, and cropland. At the base of the dam, the reservoir <br /> <br />level can be raised a maximum of 114 ft (35 m) above the current river- <br /> <br />water level (Lower South Platte Water Conservancy District, 1968). <br /> <br />The hydrologic systel1l at this site, as in most of the South Platte <br /> <br />River valley in Colorado, is a complex interaction between surface and <br /> <br />bru.....ilJ .....'-! Lei' (H....IT .i.liHI ot.hC:.l.-S, <br /> <br />'''-71::\ <br />....;. i....J J . <br /> <br />,...._~~-..... ..............~ .;..... ..l.,f~..........,.."'''' -1=............. <br />~~~.~~~ ~U~~L _~ U~._L~~_ ~._... <br /> <br />the river' through irrigation ditches. Seepage from canals and the <br /> <br />application of the water on cultivated land recharges the ground-water <br /> <br />system. In some areas, recharge is exceeded by discharges from irri- <br /> <br />gation wells and evapotranspiration., The ground water then flows down- <br /> <br />gradient, eventually returning to the river. <br /> <br />I) <br /> <br />? <br />