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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 />Glossary <br /> <br />Consumptive Use (acre-feet [AF]): the actual amount of irrigation water that is <br />consumptively used by the crop. This value can be no greater than the Crop Irrigation <br />Water Requirement (IWR), and is a function of system efficiency and water <br />availability. <br /> <br />Crop Irrigation Water Requirement (AF): an on-farm crop consumptive use demand, <br />typically based upon empirical equations such as the Blanney-Criddle or Penman <br />Monteith methods. This value is measured as a depth and can be converted to a <br />volume based on acreage. StateCU estimates the irrigation water requirement as <br />potential evapotranspiration minus effective precipitation. <br /> <br />Historic Water Application (AF): the total water supply provided from a source (such <br />as a river or groundwater aquifer) to meet an irrigation water requirement. Unless <br />limited by supply or decree, water application is a larger value than the irrigation <br />water requirement due to system inefficiency. This value is measured as a volume. <br /> <br />Unit Crop-Use Coefficient (AFJacre): the irrigation water requirement for a unit area <br />of a single crop. This value can be multiplied by the total acreage for a crop to <br />determine the irrigation water requirement for the total acres of the crop. <br /> <br />11 <br /> <br />S:\TASK 8 & 9 SUPPLY AND DEMAND\SWSI DEMAND METHODOLOGY 11-26-03.DOC <br />