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<math>WU= Et * Kc * Cp * A</math>
<math>WU= Et * Kc * Cp * A</math>


Where WU is water usage, Et is evapotranspiration, Kc is crop factor, Cp is canopy factor, and A is the area in m2. This allows the calculation of the water used from the soil by plants each day. The water irrigation then needs to match the outflow used by the plants and lost through evaporation. Evapotraspiration depends on the specific crop and its current growth stage. Crop appearance should not be used as the indicator for soil moisture conditions. Once crops become visibly malnourished, the yield has been irreparably damaged.
Where WU is water usage, Et is evapotranspiration, Kc is crop factor, Cp is canopy factor, and A is the area in m2. This allows the calculation of the water used from the soil by plants each day. The water irrigation then needs to match the outflow used by the plants and lost through evaporation.  


The amount of time the irrigation system needs to run each day is then WU divided by the flow rate of the emitters.
The amount of time the irrigation system needs to run each day is then WU divided by the flow rate of the emitters.
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