Irrigation in the Pacific Northwest

Historic Average Water Needs Estimate. Using 5Points.

This uses crop coefficients for 5 fixed days of year for Eastern Washington and linear interpolation between those points as in FAO 56. These crop coefficients are the defaults used in the irrigation scheduler. Go here for more information about the historical means and here for more information about the irrigation scheduler.

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WSU Prosser - IAREC, 24106 N Bunn Rd, Prosser WA 99350-8694, 509-786-2226. Contact Us