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<br />, <br />I <br />I: <br /> <br />f <br />f <br />I <br />I <br /> <br />i <br />I <br />I <br /> <br />I <br /> <br />I <br /> <br />I <br />I <br />, <br />I <br />I <br />I <br /> <br />i, <br />, . <br /> <br />II <br />; <br />I <br /> <br />, <br />-- <br /> <br />""',' ," "r.... <br />Uu l.,-,,)J <br /> <br />HYDROLOGIC MODELS INVENTORY <br /> <br />',''4" <br /> <br />EVALUATION FORM <br /> <br />NAME OF MODEL: XETCMP <br /> <br />FUNCTION: Estimates daily crop evapotranspiration using 16 different methods <br />or variations <br /> <br />AGENCY & OFFICE: USBR - Denver Office - Water Resources Section <br /> <br />TECHNICAL CONTACT: Eldon Johns (05752) 303-236-3810 <br />FTS 776-3810 <br /> <br />MACHINE COMPATIBILITY: CDC Cyber Main Frame <br /> <br />DOCllMENTATION: "Comparison of Equations Used for Estimating Agricultural Crop <br />Evapotranspiration with Field Research" by R.W. Hill, E.L. Johns, and <br />O.K. Frevert, Bureau of Reclamation, October 1983. <br /> <br />SPATIAL PRECISION: Point estimates based on weather station locations. <br /> <br />TEMPORAL PRECISION: Daily (summations give monthly) <br /> <br />OVERVIEW OF CAPABILITIES, ASSUMPTIONS: Allows comparisons of strengths and <br />weaknesses of various predictive equations. This model is mainly a research <br />tool. Assumptions vary with each of the methods. <br /> <br />STRENGTHS: Easy comparison of many widely used methods. Thoroughly tested. <br /> <br />WEAKNESSES: Rather extensive input/output requirements. <br /> <br />INPUT REQUIREMENTS: Daily climate and related data' including temperature, <br />precipitation, solar radiation, h11midity, wind speed and crop phenology. <br /> <br />OUTPUT PRODUCED: Daily evapotranspiration estimates for crops by various <br />predictive methods. <br /> <br />1-5 <br />