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• Place irrigation systems to ensure that plants receive water where they need it. For example, <br /> do not place irrigation systems downgradient of plant's root zones on hillsides. <br /> Recommended Operational BMPs: <br /> . Add a tree bag or slow-release watering device(e.g., bucket with a perforated bottom)for <br /> watering newly installed trees when irrigation system is not present. <br /> . Water deeply, but infrequently, so that the top 6 to 12 inches of the root zone is moist. <br /> . Use soaker hoses or spot water with a shower type wand when an irrigation system is not <br /> present. <br /> • Pulse water to enhance soil absorption,when feasible. <br /> • Pre-moisten soil to break surface tension of dry or hydrophobic soils/mulch,followed by <br /> several more passes.With this method, each pass increases soil absorption and allows <br /> more water to infiltrate prior to runoff. <br /> . Identify trigger mechanisms for drought-stress(e.g., leaf wilt, leaf senescence, etc.)of dif- <br /> ferent species and water immediately after initial signs of stress appear. <br /> . Water during drought conditions or more often if necessary to maintain plant cover. <br /> . Adjust irrigation frequency/intensity as appropriate after plant establishment. <br /> . Annually inspect irrigation systems to ensure: <br /> • That there are no blockages of sprayer nozzles. <br /> O Sprayer nozzles are rotating as appropriate. <br /> • Sprayer systems are still aligned with the plant locations and root zones. <br /> . Consult with the local water utility, Conservation District, or Cooperative Extension office to <br /> help determine optimum irrigation practices. <br /> . Do not use chemigation and fertigation in irrigation systems.This will help avoid over applic- <br /> ation of pesticides and fertilizers. <br /> 2019 Stormwater Management Manual for Western Washington <br /> Volume IV-Chapter 4-Page 536 <br />