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<br />CDIVI <br /> <br />Memorandum <br /> <br />To: Kelly DiNatale <br /> <br />From: Travis Bogan <br /> <br />Date: June 30, 2005 <br /> <br />Subject: CWCB North Fork Gunnison Land Use and Water Demands <br /> <br />This memorandum documents the process and results to date for the analysis of existing and <br />future 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 land use breakdowns, and parcel sizes were examined. These data <br />will be used to estimate growth within municipal boundaries and redevelopment or <br />subdivision of existing parcels. In addition, ranges of land use densities will be used to <br />estimate potential future water demands. <br /> <br />Data procurement <br /> <br />GIS land use 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; descriptions are provided in <br />Table 1. Census Tracts and population data were downloaded from the US Census Bureau's <br />Topologically Integrated Geographic Encoding and Referencing system (TIGER). The <br />Irrigated Acres coverage was obtained from the Colorado Decision Support System. <br /> <br />Estimated existing water uses, both decreed and undecreed, in the North Fork of the <br />Gunnison River basin that are in need of augmentation water were provided by the Colorado <br />Division of Water Resources. The estimated existing water uses do not include irrigation <br />rights, only springs and ponds used for domestic, stock and evaporation uses. <br /> <br />GIS Analysis <br /> <br />The eastern portion of the North Fork Water District was divided into 11 subbasins as shown <br />in Figure 1. The subbasins were further subdivided by county. The Smith Fork subbasin, for <br />example, spans all three counties and was subdivided into Smith Fork Delta, Smith Fork <br />Gunnison, and Smith Fork Montrose. <br /> <br />S :\GI S\working\Jinal_ memo\CW CB _ N _Fork0701 05.doc <br />