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I: " I' I I I ,. I I '. I I I I I I I I I I - r'- .. L I May 26, 1995 Page 2 Approp. Adjud. Name Amount Date Date Case " Peabody No. 1 Ditch 5.0 cfs 5/23/1904 3/02/1910 1277 __, Peabody No.1, Lund 1.5 cfs 5/15/1915 7/05/1916 1520 Enlargement & Extension Peabody No.1, Lund 2.0 cfs 5/15/1915 7/05/1916 86CW151 'I . ~..EMargcm:e'fit '& Extension : ";,, ,r. ,,",,, ;1- <' . .,. . , " ...'.' "It "!'he' first two rights 'lis~d above were originally decreed absolute in the case numbers shown; the third water right was made absolute after appearing on the abandonment list ' tn 1'983. Eacli of the Water Rights shown are beneficiaries of Senate Document 80; in other wOrds all of the water rights are protected from calls below Green Mountain Reservoir by releases from the reservoir. Historic diversions were tabulated for the period of 1970 to 1990, as shown in Table 1, using records from the State Engineer's Office (SEO) computerized database. No records exist for certain years which we left blank in the table; for years in which records do exist, approximately 852 acre-feet per year (ac-ft/yr) were diverted on average. Diversions generally started in early J~ and ended in late Sept~mber. Diversions were recorded as early as May and as late as mid-October. Although diversions most frequently occurred under thesenior five cfs water right, there are several instances where diversions were made under the two junior,water rights as well. Historically, the water rights under the Peabody No.1 Ditch have irrigated about 60 acres of pasture. The annual irrigation water requirement or consumptive use (Cm for areas around Dillon is about 1.45 ac-ft per acre. This value was previously decreed in the Consolidated Decree for Water Court case numbers 80CW444, 81CWI07, 81CW487 and 81CW488 in which the Town of Breckenridge changed a series of water rights associated with th~. CI-,:ytt~n Hill R:my't.. Tha hi.;tv:i~1y itTigateJ iand& for the Ciayton Hills Ranch were generally located across the Blue River in the vicinity of and downstream from the Slate Creek Ranch. The Breckenridge case CD was deemed to be appropriate for the Slate Creek Ranch, where historical irrigation conditions were very similar. Using the value from Breckenridge's consolidated decree indicates that over the 60 acres historically irrigated, the irrigation watsrrequirement was approximately 87 ac-ft/yr, on average. A pre1;m;nary depletion analysis was performed using an in-house water budget spreadsheet developed by Bishop-Brogden Associates, Inc. Historically, only a portion of your water was consumed by the crop; the remainder returned to the river system. Although the Peabody No.1 Ditch diverted water from Boulder Creek approximately three miles upstream from its confluence with the Blue River, re~rn flows from the lands irrigated on the Slate Creek Ranch returned to the Blue River approximately four miles downstream from the confluence. The historic depletion is the net impact a water right exerts on the stream system, and is equal to the diversion less the return flow; assuming that the water supply is adequate, the historic depletion equals the irrigation water requirement calculated above. I Bishop,Brogden Associates, Inc.