All sprinkler systems distribute water unevenly.
This results in the need to apply additional water to insure that all of the plants receive enough water. You can use the application rate to calculate how long to run your sprinklers to apply a specific amount of water. The DU measures the application of water in the driest areas as compared to the average. This is important because we want to water so that all of the grass is healthy. We use DU for scheduling to adjust the average application rate to get a modified application rate used for scheduling the length of irrigation, Well designed home sprinkler systems have typical application rates and uniformity's shown in the table below.