Online course from the Irrigation Training & Research Center.Two of the most important concepts in landscape irrigation are distribution uniformity and precipitation rate. DU refers to how evenly water is applied to a landscape. DU is used to measure the performance of an existing irrigation system and is determined through a catch can test. Precipitation rate identifies the rate at which irrigation water reaches the ground surface, and is affected by sprinkler flow rate and area of coverage. PR is an important value that is used in both system design and irrigation scheduling.
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