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9/24/2019 <br />Conducting an Irrigation Audit <br />Calculating Distribution Uniformity (DID) <br />To estimate DU calculate the average volume of water from the lowest <br />quarter of catch cups (LQ,,) and divide that average by the overall <br />average depth of all cans. <br />—Example from previous slide LQ„q = 0.10 inches <br />—010inches /0.1e inches =56 % Distribution UniPoomiry <br />Irrigation systems with lower than 60% uniformity should be adjusted for <br />more uniform coverage <br />Pai <br />Rain Sensors <br />- $20 to $ao <br />Bypass irrigation �k <br />—Shutoff sprinkler system immediately <br />—Rainfall threshold shutoff <br />Common IRS use cork disks which swell upon <br />wetting which triggers a signal to irrigation <br />controller to bypass scheduled irrigation <br />Ventilation window influences amount of time <br />system remains in bypass mode <br />27 <br />