Set your sprinkler output and the rain you already got to see how many minutes to run each session.
How it works
Water still needed ÷ sprinkler output in inches per hour × 60 gives minutes for the week. Divide by your number of waterings. Gallons are area × inches × 0.623.
Before you order
- Run a catch-can test with flat-bottomed cans to find your real output in inches per hour.
- Water in the early morning so leaves dry quickly and less is lost to evaporation.
- Longer, less frequent sessions build deeper roots than a daily sprinkle.
Common questions
How much water does a lawn need per week?
About 1 inch for an established lawn, including rainfall, with more in hot, dry weather.
How do I measure sprinkler output?
Set several flat-bottomed cans around the lawn, run the sprinkler for 30 minutes, then measure the depth and double it for inches per hour.