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Letter Concerning North Platte Depletions Meeting
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Letter Concerning North Platte Depletions Meeting
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Last modified
1/26/2010 4:40:55 PM
Creation date
7/20/2009 9:24:22 AM
Metadata
Fields
Template:
Water Supply Protection
File Number
8461.250
Description
Water Issues
State
CO
Basin
South Platte
Water Division
1
Date
1/27/2005
Author
Ted Kowalski
Title
Letter Concerning North Platte Depletions Meeting
Water Supply Pro - Doc Type
Correspondence
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baseline population of Jackson County by averaging the estimated populations for 1992-1996. Colorado <br />estimates that the 2004 population for Jackson County is 1554 people. The State demographer does not <br />predict the Jackson County population to exceed 2022 people by the end of the first increment. <br />Piscatorial, wildlife, and other environmental uses implemented on or before July 1, 1997 will constitute <br />existing uses. Any water diverted for these purposes implemented after July 1, 1997 will constitute new <br />water related activities. <br />D. New Water Related Activities <br />For purposes of the Program Cooperative Agreement, the parties agree to the following: <br />Agricultural Water Use: Irrigation of more than 134,468 will constitute new water related activities. <br />The parties agree that net depletions (diversions less return flows) associated with imgating additional <br />acres as measured at the Colarado - Wyoming stateline equal .83 acre-feet per acre during the <br />irrigation season. Colorado does not expect to have any new depletions during the first increment. <br />2. Municipal and industrial uses: Colorado does not expect the Jackson County population to exceed <br />2022 in the first increment. When population in Jackson County reaches 1900, Colorado will <br />present a municipal and industrial new depletion plan to the Governance Committee for approval. <br />Similar to the methodology adopted for the South Platte new depletion plan, new municipal and <br />industrial water uses are assumed to be .27 acre- feet per capita per year. Consumptive use is 35% of gross <br />water use, unless otherwise reported to the Governance Committee by the State of Colorado. The <br />parties agree that the monthly distribution of the depletive effect of this municipal and industrial <br />water use is the same as that defined for the South Platte Basin, unless otherwise reported to the <br />Governance Committee by the State of Colorado.s <br />3. Piscatorial, wildlife, and other environmental uses: To the extent that these uses are not incidental <br />to an existing or new irrigation use, such uses implemented after July 1, 1997 will constitute new <br />water related activities. Depletions associated with such uses will be deternuned from Colorado <br />Division of Water Resources information on actual annual depletions. It is expected that all new <br />piscatorial, wildlife, and other environmental uses will have a federal nexus. <br />E. Monitoring and Reporting <br />During the first increment, Colorado does not faresee any: projected increases in: irrigated acreage in <br />Jackson County over 134,467 acres; or an increase in population over the 2022 person "population <br />baseline." Similar proj ections will be made at the beginning of each subsequent reporting period. At <br />the end of the first reporting period, and at the end of each subsequent reporting period, Colorado will <br />report to the Govemance Committee the irrigated acreage, irrigation storage, transbasin diversions and <br />population in Jackson County. Colorado will also report on any non-nexus piscatorial, wildlife, and <br />other environmental uses and any new industrial uses occurring since 1997. <br />5 These South Platte River Basin derived assumptions probably significantly overstate actual M&I water <br />use in Jackson County. The gross M&I consumptive use assumption of .27 acre-feet per year is probably <br />high 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 shorter, cooler <br />summers limit lawn irrigation to a shorter time period than occurs in the South Platte Basin. Thus, M&I <br />uses in Jackson County are likely to produce fewer depletions during the months of shortage to target flows <br />at Grand Island in comparison with M&I uses in the South Platte Basin. However, in the absences of <br />specific data, Colorado agrees to apply South Platte Basin assumptions to M&I use in Jackson
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