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<br />. <br /> <br />IV. Use and Effect Assumptions Associated with New Water Related Activities <br /> <br />. <br /> <br />For purposes of the Cooperative Agreement, the parties hereby agree to the following: <br /> <br />a. Agricultural Water Use: Depletions associated with irrigation of between 134,468 <br />and 145,000 acres will constitute new water related activities. The parties agree <br />that net depletions associated with irrigating additional acres as measured at the <br />Colorado-Wyoming stateline equal .75 acre-feet per acre per year, unless <br />otheIWise reported to the Governance Conunittee by the State of Colorado.J <br /> <br />b. Municipal and industrial uses: Municipal and industrial uses associated with <br />population growth in Jackson County over the population baseline constitute new <br />water related activities. For purposes of calculating depletions associated with <br />these new water related activities, gross municipal and industrial water use is <br />assumed to be .25 acre-feet per capita per year and consumptive use is 35% of <br />gross water use, unless otherwise reported to the Governance Conunittee by the <br />State of Colorado. The parties agree that the monthly distribution of the depletive <br />effect of this municipal and industrial water use is the same as that defined for the <br />South Platte Basin, unless otheIWise reported to the Governance Committee by <br />the State of Colorado: <br /> <br />c. <br /> <br />Piscatorial and other environmental uses: Such uses in excess of that allowed <br />under rights senior to July I, 1997 constitute new water related activities. <br />Depletions associated with such uses will be calculated by subtracting evaporation <br />from annual total diversions. . <br /> <br />. <br /> <br />d. Net cumulative effect: To calculate net cumulative effect of depletions on the <br />habitat, the parties agree to apply transit loss factors, measured from the <br />Colorado-Wyoming stateline to Grand Island, Nebraska, to calculated monthly <br />depletions associated with new water related activities. Transit loss factors will be <br /> <br />J Three studies - one by the Wyoming State Engineer in 1921, one by the Colorado Water Conservation <br />Board in the 1930s, and an unpublished graduate thesis completed for the Michigan River basin in 1977 - <br />substantiate that annual consumptive use associated with irrigation in North Park is .75 acre-feet per acre <br />per year. <br /> <br />4 These South Platte River Basin-derived assumptions probably significantly overstate actual M&I water <br />use in Jackson County. The M&I consumptive use assumption of .25 acre-feet per year is probably high <br />because lawn irrigation is less prevalent in Jackson County than in the South Platte River Basin. The actual <br />monthly distribution of the depletive effects associated with M&I use in Jackson County is 'probably <br />different than that of the South Platte Basin, since Jackson County's higher elevation and longer winters <br />limit lawn irrigation to a shorter time period than occurs in the South Platte Basin, Thus, M&I uses in <br />Jackson County are likely to produce fewer depletions during months of shortage to target flows at Grand <br />Island in comparison with M&I uses in the South Platte Basin. However, in the absence of specific data, <br />Colorado agrees to apply South Platte Basin assumptions to M&I use in Jackson County. <br /> <br />. <br /> <br />Colorado's Future Depletions Proposal for <br />New Water Activities in the North Platte Basin, <br />Jackson County, Colorado <br />January 6, 1998 <br /> <br />Page3 of 4 <br />