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O~0-484 ,,' . , ' hydropower penstock are typically about 20 cfs. In the original USBR analysis of the project. the total irrigation requirement was based on the assumption of 3.28 acre-feet of delivery per acre over the then anticipated 51.825 irrigable acres. resulting in a project demand of 169.986 acre-feet per year. This is considered to be a "full water supply". According to the Water Commissioner for District 31 and personnel at the Pine River Irrigation District. the actual amount of reservoir storage water delivered to the stockholders and the Indian facilities is typically less than the 125.000 acre-feet in the active storage pool. Historically, there has always been sufficient storage water. when used in conjunction with the adjudicated direct flow water rights, to satisfy all of the irrigation demands. ' Nearly all of the major irrigation structures that divert from the Pine River are entitled to Project water from Vallecito Reservoir. These include the Indian owned irrigation ditches that hold the No. , priority on the river (Pine River Priority P,l). The P-' priority is attached to the following ditches: NAME WOlD AMOUNT Dr. Morrison Ditch Ceanaboo Ditch Spring Creek Ditch 310505 310502 310509 Subtotal 64.83 cfs 9.79 cfs 50.00 cfs 111 , 24.62 cfs Agency Ditch Buckskin Ditch La Boca Ditch Severo Ditch Thompson Epperson 310500 310501 310507 310508 310663 0.75 cfs 2.50 cfs 14.27 cfs 4.25 cfs 2.34 cfs 121 (1) The Indian water rights in the Spring Creek Ditch total 83.20 ets. By contract with the ditch company, the diversion is limited to 60 efa. (2) This is an undecreed Indian water right diverted through this structure. When the river g08S on administration, this water right receives 8 full storage allotment. During administration of the river, the Water Commissioner only administers the first three of the Indian water rights (124.62 cfs). The remaining water rights are downstream and are generally satisfied by return flows froin upstream irrigation. The Southern Ute Indian Tribe is entitled to 1/6 of the active storage in Vallecito Reservoir or approximately 20,900 acre,feet. However, because of the senior priority date associated with the Indian ditches, the historic Project storage releases to these structures are typically less than 5,000 acre,feet per year. The remaining users of Project water from Vallecito Reservoir are the stockholders of the Pine River Irrigation District. Each year, the District makes a determination of the amount of Project water that' will be available, with consideration of the existing storage levels and anticipation of the projected runoff. The resulting allocation to each shareholder is then based on the number of Project acres irrigated by that individual divided by the total Project acreage (Non- Indian). Typically, the allocation ranges from 2.0 to 2.5 acre,feet per acre. This can be estimated 19