Generally speaking, the application of 1 to 1-1/2” of water per week is ok.  This figure is based loosely on historical evapotranspiration (ET) data for the hottest driest part of the summer.  A zone of rotor heads should run 3-4 hours per week to accomplish this.  Spray or mister zones may require 45-60 minutes per week.  Adjust the amount of water needed in a week into zone run times that match your soil type to prevent run off or to prevent water from percolating to quickly. For instance, clay soils may need shorter run times but multiple start times during the day to allow water to soak in.  Sandy soils “perk” very quickly so the same idea will apply. Drip irrigation zones are programmed similarly but the run time will be in hours instead of minutes.

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