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Table 1 <br />Aggregate Reservoir Surface Area by Water District <br />Using GIS Method <br /> <br />River <br />Basin <br />Water <br />District Total GIS <br />Surface Area <br />Acres <br />South Platte 1 5,279 <br /> 2 5,667 <br /> Upper 3 552 <br /> Lower 3 6,141 <br /> Upper 4 657 <br /> Lower 4 4,299 <br /> Upper 5 291 <br /> Lower 5 3,870 <br /> U er 6 431 <br /> Lower 6 3,286 <br /> Upper 7 479 <br /> Lower 7 2,104 <br /> 8 1,906 <br /> Upper 9 120 <br /> Lower 9 727 <br /> 23 * 994 <br /> 48 * 442 <br /> 64 1,056 <br /> 80 * 397 <br /> Total 38,691 <br /> <br />North Platte 47 * 4,994 <br />* Estimated natural lake area not included in Surface Area <br />Decree Reservoir Area -Approach and Results <br />The following process was used to aggregate reservoirs using the Decree approach. <br />1. HydroBase was queried using StateView to show absolute water rights in Division 1 and <br />Water District 47 associated with reservoirs (water rights structure code 3). <br />2. The StateView query was further restricted to reservoirs with decreed volumes greater <br />than 30 acre-ft. Reservoirs with volumes decreed for less than 30 acres areas were <br />classified as stock ponds, as opposed to reservoirs, for the comparison with the GIS <br />method. The 30 acre-ft volume was determined by multiplying the smallest reservoir <br />surface area that appears in the Waterbodies.shp file (3 acres, determined by satellite <br />imagery resolution) by the 10 feet average depth identified for aggregate stock ponds in <br />the Task 69 scope. <br />3. The resulting reservoirs were exported to Excel and key reservoirs were removed from <br />the analysis. <br />Page 4 of 14 <br />