Garden Watering Needs
Calculate how much water a lawn or garden needs per week from the area, rainfall and irrigation efficiency, free online.
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Most lawns and vegetable gardens need about 25 mm (1 inch) of water a week including rain. 1 mm of water on 1 m² is 1 litre. Required irrigation = (target − rainfall) × area ÷ efficiency. Sprinklers are 65–75% efficient; drip irrigation 90%.