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<br />. <br /> <br />. <br /> <br />. <br /> <br />CDNI <br /> <br />Memorandum <br /> <br />To: Todd Doherty and Jeff Baessler, GWGB <br />Dave Kanzer and Dave Merritt, GRWGD <br /> <br />From: Kelly DfNatale and Travis Bogan. CDM <br /> <br />Gc: Wayne Schfeldt. Divfsion of Water Resources <br />Erin Wifson. LRE <br /> <br />Date: January 18, 2006 <br /> <br />Subject: Projected Consumptive Use Water Demands for the North Fork of <br />the Gunnison in stream flow analysis <br /> <br />This memorandum documents the process and final results for the analysis of existing and <br />futuTe land uses and water demands for the North Fork of the Gunnison as part of the in <br />stream flow analysis. <br /> <br />Delta County. Gunnison County, and Montrose County GIS coverages were used to assist in <br />developing estimates of developable land. both currently irrigated and non-irrigated. <br />Population density and I.md use breakdowns, and parcel sizes were examined. These data <br />were used to estimate growth within municipal boundaries and redevelopment or <br />subdivision of existing parcels. In addition, ranges of land use densities were used to <br />estimate potentidl future water demands. <br /> <br />Data procurement <br /> <br />GIS landuse parcel coverages and topographic contours were graciously provided by Delta <br />County, Gunnison County, and Montrose County. Delta County, Gunnison County, and <br />Montrose County each use different land use classifications; therefore, similar landuse <br />classifications were aggregated to develop consistent land use comparisons bern..een counties. <br />Census Tracts and populdtion data were downloaded from the US Census Bureau's <br />Topologically Integrated Geographic Encoding and Referencing system (f1GER). Preliminary <br />population forecasts by region and county (2000 to 2030) were downloaded from the <br />Colorado State Demography Office (OOLA) website. The Irrigated Acres coverage and <br />consumptive use estimdtes .....ere obtained from the Colorado Dt.'Cision Support System. <br /> <br />Estimated existing consumptive water use, both decreed and undecreed, in the North Fork of <br />the Gunnison River basin requiring augmentation water were provided by the Colorado <br /> <br />SIS>'iSl2'__f(lt\__~"6Ol1\CWCll"f(lt\l.17.ol1<lOC <br />