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<br />Nation Engineering Services, LLC <br />P.O. Box 314 <br />Fort Morgan, CO 80701 <br /> <br />December 17, 2003 <br /> <br />Tom Gill <br />15335 Hwy 6 <br />Merino, CO 80741 <br /> <br />Dear Mr. Gill: <br /> <br />Nation Engineering Services, LLC (NES) has conducted preliminary irrigation <br />requirement and water right analysis upon your request. This report <br />summarizes the analysis and will be followed with recommendations by NES <br />about proceeding from this point. <br /> <br />Irrigation Water Requirements <br /> <br />The irrigation water right analysis was conducted to determine the lagged <br />stream depletions to the South Platte River. This analysis included <br />cropping information from our December 11, 2003 meeting and cropping <br />reports turned into the GASP office. These pieces of information allowed a <br />detailed initial analysis of your crop water use from 1996 to 2002. The <br />methods used were based upon the Penman-Monteith equation found in the FAO <br />Irrigation and Drainage Paper 56. This equation uses cropping types <br />combined with weather station data and basic soil information to determine <br />crop evapotranspiration. The result is then put into a water budget which <br />incorporates surface diversions, well production, SDF, and application <br />efficiency. <br /> <br />The preliminary irrigation water requirement for 939 acres of field crops <br />your records indicate calculated by the Penman-Monteith equation is 564.3 <br />acre feet. This includes actual weather conditions by day and records of <br />surface water diversion from 1996 to 2002. The preliminary monthly <br />irrigation water requirements are presented in Table 1. <br /> <br />Table 1 - Preliminary Irrigation Water Requirement <br /> <br /> <br />Stream Depletion Factors <br /> <br />The irrigation water requirement taken from the water budget model is put <br />into the Colorado State University Integrated Decision Support System <br />Alluvial Water Accounting System (AWAS). This model has the ability to use <br />the Stream Depletion Factor (SDF) method of lagging irrigation water <br />requirements to the South Platte River. The wells were located on the <br />United States Geological Survey Map Showing Stream Depletion Factor of the <br />