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0 <br />The model distributes the available surface water according to the <br />Doctrine of Prior Appropriation. The first water right is given the <br />amount of water decreed if the canal has a demand for water that month. <br />The model then calculates the effect of this diversion. Each water right <br />on the priority list is allowed to divert its right, provided that (1) <br />the canal has a demand for water that month, (2) the water is available <br />at the canal headgate, and (3) the diversion will not harm any canal <br />a <br />diverting under an earlier water right. If any of these restrictions <br />apply, the diversion is reduced until all restrictions are met. After <br />the proper diversion under a particular water right is determined, the <br />effect of this diversion on the entire system is calculated. <br />After all. a_ vai 6 _ lab]__e_ &ur-f,aee wwte- r- _..1las been distributed, those areas <br />r / ' T � de fi c ien t � t su <br />t o <br />unde.. canals wit.. de�icien supplies are allowed o pump supplemental <br />water according to their needs and pjmgC nU M capacities. <br />John Martin Reservoir is operated under the rules set forth in the <br />Arkansas River Compact. This compact specifies that the reservoir will <br />start storing water on November 1 and will release the water upon demand <br />to Colorado and Kansas users starting on April 1. Sixty percent of the <br />release goes to Colorado users and 40 percent goes to Kansas users if <br />these users demand water. Excess inflow during the summer may also be <br />stored. Evaporation from the reservoir is calculated each month based <br />on the area - capacity relationship of the reservoir and pan evaporation <br />at the reservoir. A pan coefficient of 0.7 is used to convert pan <br />evaporation to lake evaporation (Chow, 1964). <br />10 <br />