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<br />Return flows from demand groups (1) and (2) are assumed to return below the head gates of the <br />? <br />upper ditches, including the Feeder Canal, but would be available for diversion by the rights in <br />demand groups (3) and (4). Return flows from demand group (3) are assumed to return to the <br />Smith Fork, and the return flows from demand group (4) are assumed to return to the North <br />Fork of the Gunnison River downstream of Hotchkiss. <br /> <br />Crawford Reservoir is allowed to fill beginning on November 1 of each year to the extent of a <br />? <br />one fill rule. <br /> <br />During the storage period, the model first uses non-irrigation season inflows to the reservoir <br />? <br />from Iron Creek if the reservoir storage rights are in priority, and then uses diversions from the <br />Smith Fork via the Feeder Canal. This is subject to the one fill rule and the feeder water right <br />being in priority. The reservoir is operated only to the extent of its project water storage <br />volumes, i.e. 10,350 acre-feet. <br /> <br />Reservoir evaporation is computed using unit net evaporation values obtained from GUNMOD <br />? <br />and monthly end-of-month surface acreages derived by the model based on end-of-month <br />contents and the elevation-area-capacity relationship. <br /> <br />The model does not attempt to operate its fill protocol to prevent spills. <br />? <br /> <br /> <br />3.0 CONCLUSIONS AND RECOMMENDATIONS <br />During the Phase IIa development of the water rights planning model, interviews were held with the <br />Manager of the Crawford Water Conservancy District in order to gain understanding of the operations of <br />the direct flow water rights on the Smith Fork, in conjunction with Crawford Reservoir. Although the <br />majority of the input data for this area was imported from the GUNMOD model, the MODSIM model <br />includes certain modifications to reflect the actual operations as understood from the interview. These <br />include modifications of the demand nodes and adjustments to the irrigated acreage values for the <br />various demands, as reflected in this memo. With these modifications, the CRDSS water rights planning <br />model is structured to reasonably represent the operations of these water rights. <br />Reference is made to the on-line documentation for the MODSIM model for additional information <br />related to the implementation of the Smith Fork water rights in the model. <br />6 <br />A275 01.09.95 1.15-24 Fosha, Hyre <br />