Table A4.4 Zinc: preventive measures for roofwater irrigation Control points Preventive measures Target criteria Verification Irrigation rates should be Source less than approximately water 300 mm/year. Limit irrigation using roofwater to 10 years unless monitoring shows soil zinc levels are below Irrigation target criteria. or watering No zinc-coated roofing material. Median zinc concentration in soil should be less than 200 mg/kg. Not applicable. Soil zinc concentrations are below critical limit for plant toxicity. Avoid irrigating using roofwater from roofs (eg galvanised iron) or painted roofs. Irrigation tools
Table A4.4 Zinc: preventive measures for roofwater irrigation Control points Preventive measures Target criteria Verification Source water Irrigation or watering Avoid irrigating using roofwater from roofs (eg galvanised iron) or painted roofs. Irrigation tools Irrigation rates should be less than approximately 300 mm/year. Limit irrigation using roofwater to 10 years unless monitoring shows soil zinc levels are below target criteria. No zinc-coated roofing material. Median zinc concentration in soil should be less than 200 mg/kg. Not applicable. Soil zinc concentrations are below critical limit for plant toxicity.
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