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J <br />The reservoir stores water from Middle Hunt Creek as well as water imported from tributaries of <br />South Hunt Creek via the Allen Basin Supply Ditch (WDID 580506). This supply canal, although <br />large in decreed capacity at 60 cfs, diverts relatively small quantities of water during the spring runoff <br />before the more senior rights on the streams call for water. <br />Storage water in Allen Basin Reservoir is used to provide supplemental irrigation supplies to several <br />direct flow ditch structures in the Hunt Creek drainage. Using information provided by the Water <br />Commissioner, the ownership sub - accounts for the Bull Creek Ditch (179 acre feet), the Lateral A <br />Ditch (333 acre - feet), the Simon Ditch (287 acre - feet), and the Unmodeled Structures (276 acre -feet) <br />are aggregated into a single pool (1,075 acre -feet) in the reservoir. The sub - accounts for the Collins <br />Ditch and the Mill Creek Ditch are explicitly modeled. Allen Basin is operated with three accounts <br />and one water right as shown in Tables 4.5.3a -c. <br />TABLE 4.5.3A <br />Allen Basin Reservoir Accounts <br />Reservoir <br />Account <br />Owner <br />Ca aci acre -feet <br />Allen Basin <br />1 <br />Collins <br />593 <br />Allen Basin <br />2 <br />Mi11Cr <br />582 <br />Allen Basin <br />3 <br />A - ool <br />1,075 <br />TABLE 4.5.3B <br />Allen Basin Reservoir Storage Rights <br />Structure ID <br />Reservoir <br />Admin # <br />Amount acre -feet <br />Fill <br />583500 <br />Allen Basin <br />39254.37913 <br />2,250 <br />1 <br />mote: i ne smgie storage right for Allen Basin Reservoir is used to fill all three accounts. <br />TABLE 4.5.3C <br />Allen Basin Reservoir Operating Rights <br />System <br />Admin # <br />Type <br />Description <br />OPR ALLEN TO COLLINS <br />39254.37914 <br />2 <br />Release to direct diversion <br />OPR ALLEN TO SIMON <br />39254.37914 <br />2 <br />Release to direct diversion <br />OPR ALLEN TO LAT A <br />39254.37914 <br />3 <br />Release to diversion by carrier <br />OPR ALLEN TO MILL CR <br />40753.00001 <br />3 <br />Release to diversion by carrier <br />OPR ALLEN TO BULL CR <br />39254.37914 <br />3 <br />Release to diversion by carrier <br />OPR ALLEN TO COLLINS <br />39254.37915 <br />2 <br />Release to direct diversion <br />OPR ALLEN SUPPLY TO RES <br />39254.37914 <br />11 <br />Direct flow demand through <br />intervening structure <br />There are three types of StateMod operations used to model the operating policies of Allen Basin <br />Reservoir: 1) a release from storage to a direct diversion downstream (type 2), 2) a release from <br />storage to a direct diversion through a carrier structure (type 3), and 3) an intervening structure <br />supplying water to a storage demand at the reservoir (type 11). <br />Operating right 1 releases water from account 1 to the Collins Ditch (580591). The administration <br />number for this operating right is junior to both the direct flow right at the direct diversion and the <br />Operating Criteria File 4 -24 <br />