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<br />CWCB North Fork <br />7/5/2005 <br />Page 3 <br /> <br />subtracting the municipality population within that census tract from the total population, <br />and dividing that figure by the area of private land use within the unincorporated portion of <br />the census tract. Population densities for each private parcel within <br />incorporatedl unincorporated areas of a census tract were assigned. The population densities <br />and private land area within a subbasin were used to calculate the population within each <br />subbasin and a weighted average population density, shown in Appendix A. <br /> <br />The revised land use parcel and irrigated acre attribute tables were exported to Excel and a <br />combination of lookup and conditional functions were used to sum the acreage by subbasin <br />and land use classification, determine the population, and calculate weighted average <br />population density. <br /> <br />Future water demand estimation <br /> <br />Water use will be estimated as a function of land use and compared to population-based <br />water demands. The number of parcels of various sizes (6000 sf to 1 acre, > 1 acre to 10 acres, <br />>10 acres to 35 acres, and > 35 acres) were counted by land use type to assist in estimating <br />future water use. Future water use, for example, may be estimated by assuming parcels <br />greater than 35 acres will be subdivided into 35 acre parcels. <br /> <br />Decreed and undecreed water use will also considered in this analysis by incorporating <br />estimated existing water uses in the North Fork of the Gunnison River basin that are in need <br />of augmentation water. The estimated existing water uses provided by the Division <br />Engineer's Office do not include irrigation rights, only springs and ponds used for domestic, <br />stock and evaporation uses. <br /> <br />cc: D. Pascali <br /> <br />S :\GI S\working\Jinal_ memo\CW CB _ N _Fork0701 05.doc <br />