Unit dust tear tanks leaves system debris process concept filters Purpose recharge rooftops sediments later use Wide Range Components Efficiency structures impurities Definition storage tank crucial role Leaf screens key features minimal wear efficient use allegianceindia External Energy Easy Installation essential practice rainfall intensity gravitational force roof catchment area Allegiance Enterprise various site conditions different rooftop areas Allegiance Water Management variable rainfall intensities Rooftop Rain Water Harvesting Roo ftop Rainwater Harvesting The Rainy Dual Intensity Filter Rainy Filter Rooftop Rainwater Harvesting