BM Cassia Rain Water Harvesting - Rajesh Agrawal
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Challenges & Learnings of Rain Water Harvesting. A case study.
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BM Cassia Rain Water Harvesting - Rajesh Agrawal
- 1. BM Cassia RWH Challenges & Learnings Rajesh Agrawal Water workshop Organized jointly by BAF, ADDA, Citizen Matters & Biome 23 Mar 2019 at TERI Auditorium, Domlur Presented for ADDA Water Workshop III
- 2. RWH – Challenges & Learnings Challenges Solutions Requirements • Confusion regarding RWH Objective Dialogue with Residents & Vendors Balance – Storage vs Ground-Water Recharge Design & Implementation • Space for Tanks • Space for Recharge-Pits • Type of Filter Dialogue with Multiple Vendors Tanks under a Ramp Recharge-Pits in garden near Storm-water outlet Bottoms-Up conventional Sand/Charcoal filter Testing & Acceptance • Lack of Rains for 2 years • Basement Flooding Negotiation with Chosen vendor Basic functional testing was done with piped water RWH Bypass designed and implemented Operational • Rooftop Gardening/ Wet Waste Processing • Pipes bursting & flooding during heavy rains • Inability to leverage more than 30 min of heavy rain Leverage Operational Staff to Diagnose & Fix Education and regular maintenance Additional Storm-water outlets created Added more pipes to pump RWH water to sumps
- 4. To Recharge Pit & Storm Water Drain Rain water from Rooftop Multiple RWH Bypass Valves Pressure Guage Filter bypass/ Cleaning Valve Basement Water Tanks 30KL 2KL RWH Valve Pump Ground level Water Tank Gardening/ Car-Wash Water to Sump Sump Valve Filter Lake BM Cassia RWH Schematic
- 5. BM Cassia RWH Pictures Recharge Pit At Construction At Completion Filters, Gauge and Storage Tanks in Basement
- 6. RWH Project Information • Initial Project Vendor – Refurb India • Rooftop Surface Area – 1700 Sq. M • Total Cost – Rs 5.75 Lakhs • Pipes & Valves • Tapping into rooftop water & diverting to filters that take it to Tanks • Tanks to Sumps • Storage Tanks • Pumps • 2 Recharge Pits • Project Dates Nov 2011 to Jan 2012 • Upgrades Done • Additional Stormwater Outlets – For use during excessive rains • Additional connection from Tank to Sumps – To utilize more RainWater • RWH Water-Meters – For Accounting