Mail id future use storage tank More Ditalls roof gutters water supply water levels Drought Risks water quality water scarcity Mitigates Flood Collection Pipe water resources watering gardens Distribution Pipe impermeable areas valuable technique Water Conservation intended destination impermeable surfaces surface water runoff Allegiance Enterprise other system parameters traditional water sources potable household activities Rooftop Rainwater Harvesting System Allegiance Water Management YouTube AllegianceWaterManagement Rooftops Rain Water Harvesting