Pune Days mind surat Nasik tanks hours waste Nagpur Answer Baroda Rajkot Rupees Indore Bhopal average storage Gujarat Bharuch process Filters Vadodara Rainfall Ahmadabad roof tops Ahmedabad future use Piezometer reservoirs Civil Cost Ankaleshwar Nominal cost new question Rooftop Area Plumbing Cost spell of rain household needs roof catchments Percolating Pit liters of water Percolation Pit Lakhs of Litter Harvested rain water appropriate location Rainy Rooftop Rainwater Borewell Recharge System Digital Water Flow Meter cost of Harvest Rainwater Allegiance Water Management Digital water Level Recorder Rooftop Rainwater Harvesting Rainy Session total rainwater Rooftop Rain Water Harvesting artificial recharge techniques sub-surface ground water reservoir