Unit roads color drains Filter storage surface terrace flat RCC benefits reliance flooding rainfall turbidity courtyard irrigation clean silt atmosphere open ground contaminants sloping roofs key components catchment area other deposits building roofs water scarcity microorganisms Transportation garden watering toilet flushing laundry washing allegianceindia initial flushing less consumption cleaning products harvesting system groundwater levels Reduced Dependency sustainable method Water Availability rechargeable water rooftop harvesting first flush device Rooftop Rain Water Quality Improvement Harvested rainwater Environmental Impact Soil Erosion Control Allegiance Enterprise Groundwater Augmentation UV-resistant water pipes traditional water sources llegiance Water Management Rooftop Rainwater Harvesting sustainable water management potable household activities