2018-08-20_PERMIT FILE - M1996049

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Mr. Raul Passerini, P.E. Page 5 June 24, 2015 Case priority Appropriation Decreed Water Right Name Number Number Date Adjudication Date Amount (cfs) Famine Creek Ditch CA 1277 10 06/01/1882 03/02/1910 5.00 Old Whetstone CA 1277 22 07/01/1883 03/02/1910 1.00 Sheep Creek Ditch South Rock Creek CA 1709 251 07/07/1935 10/26/1937 8.00 Ditch McKay Ditch CA 1805 334 10/01/1926 03/10/1952 18.67 Change of Use of Famine Creek Ditch and South Rock Creek Ditch: Historically Famine Creek Ditch and South Rock Creek Ditch irrigated approximately 131.2 acres of pasture grass at the Maryland Creek Ranch property as shown on the attached Figure A-4. Of this total, 65 acres have been permanently removed from irrigation as shown on the attached Figure A-5. The historical consumptive use of the irrigation supply for the 64.96 acres was quantified based on the average monthly diversion records for the period of 1966 through 2010 for the Famine Creek Ditch and 1965 through 2010 for the South Rock Creek Ditch (adjusted to the total decreed diversion rate of 5.0 cfs for the Famine Creek Ditch and 8 cfs for the South Rock Creek Ditch), using the TR-21 Modified Btaney-Criddle Method with adjustment for elevation. Monthly temperature and precipitation data were taken from published records for Dillon 1E station and the Green Mountain Dam station. The ditch loss from the headgate to the irrigated fields was assumed to be 10 percent and an irrigation efficiency of 60 percent was used. Water in excess of the irrigation requirement was added to the soil moisture bank, which was assumed to be 3 feet deep with a water holding capacity of 0.15 inches per inch. The junior water right in the South Rock Creek Ditch (appropriation July 7, 1935) was historically called out by the Shoshone Power Plant water right. Historically the water rights within the Colorado River Basin that are junior to the Shoshone water right have been allowed to divert without curtailment because of releases of water from the Historic Users Pool ("HUP") in Green Mountain Reservoir. Once the junior water in the South Rock Creek Ditch is changed for augmentation purposes it will no longer benefit from Green Mountain Reservoir releases under the HUP. Therefore, for the purpose of this analysis, and based on the historical call of the Shoshone water right, it was assumed that the South Rock Creek Ditch was out-of-priority beginning July 1 of each year, and no historical consumptive use credits for the South Rock Creek Ditch were used for the period of July-November of each year during the study period. The average historical consumptive use during the study period from the water rights in the Famine Creek Ditch and South Rock Creek Ditch for the 65 acres was estimated to be approximately 61.37 acre-feet, as shown on the attached Table 9 or 0.94 acre-feet per acre. The historical consumptive use based on average years during the study period was compared to the historical consumptive use for the dry years for 1977 and 1994. The dry year historical consumptive use for the 1977 and 1994 was estimated at 1.05 acre-feet per acre, therefore for the purpose of this SWSP the study period average consumptive use of 0.94 acre-feet per acre was selected.