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. ';-.r"..' ........ <::,\);:.0 HYdrology Wi th the purchase of land that would be inundated by the reservoir, the area served by the Weldon Valley Canal vould be taken out of production. In the water supply analysis, it has been assumed that the Weldon Valley Canal water rights would be purchased with the la'ld and the project would thus acquire the right to 165.00 second-feet having an October 26, 188l priority. The pri1nary w"l3.ter supply for the unit would be derived from the storage of flood flows and winter flows which are presently not being diverted. A storage filing for the Narrows Reservoir has been made by the Lower South Platte Water Conservancy District, but it has not been adjudicated. Studies indicate that about 188,000 acre-feet per year are potentially available to the unit from surplus flows. The plan of development presented herein would require the transfer of point of diversion and storage right for the present Jackson Lake into the Narrows Reservoir. If the site of Jackson Lake is developed for fish, wildlife, and recreation functions, a new right to divert and store water in Jackson Lake for these purposes would be required. . WATER REQUIREMENTS Water requirements were computed for 23 of 33 ditches in the Lower South Platte Water Conservancy Dist.rict. The 23 ditches serve 98.4 percent of the irrigable land in the district. In order to simpli~J the water requirement analysis, the conservancy district was divided into subbasins Band C. Subbasin B comprises 27,540 acres of irrigable land under three canals which divert upstream from the vicinity of Fort Morgan. Subbasin C includes all other ditches and the remaining 138,830 acres of irrigable land in the district. Subbasin B has a farm headgate l~quirement of 2.34 acre- feet per acre; subbasin C has a farm headgate requirement of 2.12 acre-feet per acre. TIle water requirements for 10 small ditches were not computed nor included in the operation study, because the analysis indicated that sufficient water is pumped under these di tches to provide a full supply for the irrigable lands. This conclusion, however, need not necessarily preclude the sale of unit water to these 10 ditches. In evaluating water requirement, the classified acreage was reduced by about 6 percent to allow for non- productive land in farm roads, .ditches, etc. The acreage figures presented in the following hydrology analysis are the productive acres . 63