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Substitute Supply Ptan for the <br />I C. EvPrict Aoor~,Qata Onaratinn <br />Old Whetstone/Sheep Creek Ditch <br />The Old Whetstone/Sheep Creek Ditch is decreed for 1.0 cfs from Sheep Creek. A copy of the <br />decree is included as Attachment 4. This right has an appropriation date of July 1, 1883, an <br />adjudication date of March 2, 1910, and an administration number of 12235.00000. <br />Diversion records for the Old Whetstone/Sheep Creek Ditch aze summarized in Table 3B. Table <br />3B indicates that for the period from 1966 to 1994, the ditch diverted an average of 176.9 acre- <br />feet per yeaz, with the total amount of water in the dry year of 1978 equaling ] 78.2 acre-feet. <br />Table 3B shows that the average diversion rate for the ditch (1966 to 1994) was 0.7 cfs. <br />The historic consumptive use of the Old Whetstone/Sheep Creek Ditch was estimated using historic <br />irrigated acreage based on aerial photographs, interviews with past and present irrigators, the <br />District 36 Water Commissioner, a field inspection, and analysis of diversion records for the ditch. <br />Aerial photographs taken in 1974 and 1988 show that 17 acres of pasture grass were historically <br />irrigated with this ditch as shown on Drawing 2. Of this, approximately 10.5 acres have been <br />determined to be jurisdictional wetlands. As a result, the curtailment of irrigation using this <br />source will result in the dry-up of approximately 6.5 acres. Using the dry-year consumptive use <br />established by the Penman-Monteith method (1.62 acre-feet per acre), this results in a total of <br />10.5 acre-feet. The historic consumptive use by month is stmmarized in Table 4B. <br />McKay Ditch <br />The McKay Ditch is decreed for 18.67 cfs from the Blue River. A copy of the decree is included <br />as Attachment 5. This right has an appropriation date of October ], 1926, an adjudication date of <br />March 10, 1952, and an administration number of 32075.28032. <br />Diversion records for the McKay Ditch aze summarized in Table 3C. Table 3C indicates that for <br />the period from 1964 to 1994, the ditch diverted an average of 1,867.6 acre-feet per year, with <br />881-025.110 Wright Water Engineers, Inc. Page 8 <br />