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Water Supply Reserve Account ? Grant Application Form <br />Form Revised May 2007 <br />_______________________________________ <br />Task 2: Evaluate the Penman-Monteith equation for growing conditions in the Arkansas Valley. <br />2a. Collection of weather data - Accurate weather data are required to use the Penman-Monteith equationto <br />compute reference ET. A comprehensive weather station has been installed at the Arkansas Valley Research <br />Center (CSU AVRC) adjacent to the lysimeter. In addition, this project maintains and operates a series of <br />weather stations in Arkansas Valley. These stations are a component of the COAgMet system at CSU and their <br />locations are shown in the following map. <br />2b. Maintenance of weather instrumentation ? One major task for the project staff will be to insure that each <br />weather station is collecting accurate data. Equipment failures are detected by routine monitoring of the data <br />collected and appropriate repairs are conducted as soon as possible. Routine maintenance and regular calibration <br />of instruments are needed and will be conducted in the off-season whenever possible. Since one objective of the <br />project is to determine crop coefficients for the Penman-Monteith equation, accurate meteorological and water <br />use are both critical components. The data required to calculate reference ET with the Penman-Monteith <br />equation is mean daily maximum and minimum air temperature, humidity, net radiation and wind speed. <br />2c. Deliverables ? The weather station network will provide daily information on daily maximum and minimum <br />air temperature, humidity, net radiation and wind speed. An example of the data collected from the weather <br />station network is shown below for August 1, 2007 for the COAgMet sites in the Arkansas River Basin. <br />9 <br />