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Data Built into ISAM <br />•Crop Potential Evapotranspiration (PET) is from composite crop mix from county crop statistics for the particular ditch by year <br />•Effective Precipitation is determined using the USBR Method applied to actual precipitation by month at weather stations closest to each ditch <br />•Irrigation supply is from actual DWR diversion record data pro-rated to the farm headgate by share distribution by year along with pumping data if applicable