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(. . " , - '. - - -- ,.." 0728 The model distributes the available surface water according to the Doctrine of Prior Appropriation. The first water right is given the amount of water decreed if the canal has a demand for water that month. The model then calculates the effect of this diversion. Each water right on the priority list is allowed to divert its right, provided that (1) the canal has a demand for water that month, (2) the water is available at the canal headgate, and (3) the diversion will not harm any canal diverting under an earlier water right. If any of these restrictions apply, the diversion is reduced until all restrictions are met. After the proper diversion under a particular water right is determined, the effect of this diversion on the entire system is calculated, After all availab.le-s.ur-fuee-wa-&e"-has been distrihuted, those areas .r- canals with deficient supplies are al1c~..e-9_ t_o__I:~ supp}_c.:nE:n_t_.:ll ---- under water according to their needs and pu~~ing capacities. -- - ---~ , John Martin Reservoir is operated under the rules set forth in the Arkansas River Compact. This compact specifies that the reservoir will start storing water on November 1 and will release the water upon demand to Colorado and Kansas users starting on April 1. Sixty percent of the release goes to Colorado users and 40 percent goes to Kansas users if these users demand water. Excess inflow during the summer may also be stored. Evaporation from the reservoir is calculated each month based on the area-capacity relationship of the reservoir and pan evaporation at the reservoir. A pan coefficient of 0.7 is used to convert pan evaporation to lake evaporation (Chow, 1964). 10