05/04/2025
In Bengaluru, software engineer and environmental enthusiast Ganesh Shanbhag has been instrumental in helping apartment complexes reduce their reliance on costly water tankers through the implementation of efficient rainwater harvesting (RWH) systems. His innovative approach has led to significant water conservation and financial savings for numerous communities.
Ganesh's journey into water conservation began in 2018 when the borewells in his apartment complex dried up, forcing residents to depend on expensive water tankers. Determined to find a sustainable solution, he turned to rainwater harvesting. Despite initial skepticism from neighbors regarding the cost and complexity, Ganesh successfully implemented an RWH system for his 100-flat apartment complex at a cost of under ₹3 lakh. The results were remarkable: within two months, they saved ₹2 lakh in water bills and significantly reduced their dependence on tankers. Ganesh's RWH model captures and filters rainwater to make it suitable for daily use.
The process involves:
Catchment and Collection: Rainwater is collected from rooftops and directed through PVC gutters to downpipes, ensuring maximum capture even during moderate rainfall.
Initial Filtration: A 'first flush' system diverts the initial runoff containing dust and debris, followed by a coarse mesh filter to remove larger particles.
Advanced Filtration: A series of disc filters further purify the water, and atmospheric ozone generators ensure it meets quality standards.
Storage and Distribution: The purified water is stored in underground tanks and pumped to overhead tanks for household use.
Groundwater Recharge: Excess water is directed to recharge pits, replenishing the local water table.
Encouraged by the success in his own apartment, Ganesh extended his expertise to help other residential communities across Bengaluru. To date, he has assisted over 300 apartment complexes in implementing similar RWH systems, all without charging for his services. His efforts have not only led to substantial financial savings for these communities but have also contributed to replenishing the city's groundwater reserves.
Community Engagement and Recognition
Ganesh's dedication has garnered attention and appreciation. He is a founding member of the I Live Simply movement's Bengaluru chapter and a core executive member of the World of Water Action Forum, advocating for climate change issues, particularly water conservation. His work exemplifies how individual initiative can address urban water shortages and inspire broader community action.
