Because there is so much
variation among lawns, there is no one single answer for how much
water to apply. Turf species, climate, and sprinkler output must
be taken into account. Use the irrigation scheduling program to tailor
a watering program to your specific conditions.
See the following publications for more information:
deep and infrequently
In general, most lawns require about 1 to 1.5 inches of water per week to keep the root system moist. The root systems of established lawns generally
penetrate about 6 to 8 inches into the soil, although some warm-season
grass root systems may extend even further. Deep and infrequent watering
will help promote a vigorous root system.
If under irrigated, cool-season grasses may become semi-dormant
in the hottest part of the summer, returning to full vigor in cooler
fall weather. Regular deep watering is necessary to keep the lawn
green through the summer. Turfgrass water use rates, and the resulting
irrigation need, also vary based on location and time of year.
In shady areas, use less water than the recommended rates.
Clay soils hold water longer than loamy or sandy soils do, but
it also takes longer for water to absorb. Turf growing on heavy
clay soils should be watered less frequently and at lower rates
than on loamy soils. Sandy soils require more frequent irrigations
since they dry out quickly.