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<br />(; 4 9 .? <br /> <br />. <br /> <br />water to the Supply Canal for hydroelectric generation and the irrigation <br />of abour 130,000 acres. Between Brady, Nebraska, and Kearney, Nebraska, <br />are eight on-river irrigation canals. Much of the natural flow and <br />storage water which these canals utilize is diverted at the North <br />Platte Diversion Dam and subsequently, returned to the Platte River <br /> <br />at either the Jeffery Return located downstream of Brady or the Johnson <br />Return located between Lexington and Overton. <br /> <br />~\ <br />Flows of the Platte River at Overton have ~ra~ed 847,000 <br />(', '" ~ <br />per year during the period 1941-1970. ^ ',,' ,.:\ <br />/', v <br />". J,.> <br /><' ,;, <br />Flows of the Platte River at Overton have~~een estimated using a computer <br />, .- <br />^ -- <br />model developed by the BureaG of ReclAfuation which simulates the <br />~\. ./ <br />operation of facilitie~~c~~,~and along the Platte River and its <br /> <br />tributaries between Lewel~n, Julesburg, and Overton. Flows assumed for <br /> <br />.i <br />acre-feet <br />.:: ! <br />-=-o1.:...._~. <br /> <br />the pre-Narrows conditions were represented by a "near future condition" <br />of development upstream of lewellan and within the modeled ;reach of <br />the Platte River. Historical flows of the South Platte River at Julesburg <br />were assumed to represent the pre-Narrows flow (USBR, 1976). <br /> <br />Figure ___ shows the average annual, January-April, and May-August <br /> <br /> <br />flows at various locations within the modeled area for the period <br /> <br />1947-1970 under the pre-Narrows condition. <br /> <br />The historic flows of the Platte River at Gr~nd Island averaged 849,800 <br />acre-feet (1,173 ft3/s) and at Overton 874,300 acre-feet (1,207 ft3/s) <br /> <br />during the period 1947-1970. <br /> <br />, <br />