This calculator estimates the maximum weekly hours of irrigation need based upon weekly estimates of crop ET and the hourly water application rate of your system. The maximum weekly hours of irrigation may not be needed because in-season rainfall or soil storage may also supply the orchard with water. Feedback from monitoring plant water status with a pressure chamber or from soil moisture sensors may help guide this decision.

Depending on the irrigation system application rate, the area of soil wetted, soil intake rates, and the desired depth of wetting, the hours of weekly irrigation may need to be divided into more than one irrigation set per week.

Enter your orchard specific information into the yellow boxes and the results will display under the ‘Calculation Results’ heading below.

See our FAQs for more information on using Weekly Crop ET Reports or check our other ET calculators if you need a different conversion.