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<br />CONI <br /> <br />Methodologies for Estimating and Projecting Urban (Municipal & Industrial) and <br />Agricultural Demands and Environmental and Recreational Flow Requirements <br />November 2003 <br /> <br />Arkansas Basin <br />Although the State has not begun developing a CDSS for the Arkansas basin, several <br />engineering studies on water resources with the basin have been performed in recent <br />years. Some of these studies included the development of hydrologic / water use <br />models, such as the HI model, which was used in Arkansas River Compact <br />discussions between Colorado and Kansas to evaluate irrigation demands along the <br />Arkansas River main stem from Pueblo Reservoir to the state line. Based upon <br />discussion with DWR personnel, existing reports should be adequate for a <br />reconnaissance level investigation to describe the agricultural practices in the basin. <br /> <br />Pre-processed data for the HI model includes irrigation water requirements estimated <br />using the modified Blaney-Criddle procedure. This information should be available <br />for irrigated lands below Pueblo Reservoir to the State line. Additional data sources <br />will be needed to evaluate agricultural demands in the upper Arkansas basin and <br />along Fountain Creek. <br /> <br />Northern and Southern High Plains <br />Irrigated lands and associated demands and supply for the Northern High Plains and <br />Southern High Plains areas, including the Republican and Purgatoire River basins <br />will not be studied since these basins are considered stand-alone. Existing data on <br />irrigated acres and irrigation water use will be summarized, to the extent studies have <br />been performed and these data are made available. <br /> <br />10 <br /> <br />S:\TASK 8 & 9 SUPPLY AND DEMAND\SWSI DEMAND METHODOLOGY 11-26-03.DOC <br />