The Bangalore Development Authority (BDA) has installed 1,441 rainwater‑harvesting percolation wells in 77 parks and residential sites, capable of recharging 184.59 million litres of water annually. The project, part of the ‘One Billion Drops’ initiative, aims to benefit over 82,300 residents and enhance the city’s flood resilience.

  • 1,441 percolation wells completed
  • Annual recharge of 184.59 million litres
  • Benefits around 82,300 people

Background of the Initiative

Bengaluru has grappled with chronic water scarcity as rapid urbanisation and dwindling surface water sources strain groundwater levels. In response, the BDA launched the ‘One Billion Drops (OBD) – Groundwater Recharge through Percolation Wells’ program to bolster the city’s water security.

Implementation Timeline

Implemented between February 2025 and February 2026, the project was a joint effort by United Way of Bengaluru (UWBe) and the BDA. A total of 1,441 wells were installed across 77 BDA parks and residential premises, each featuring concrete rings, aggregate packing, iron mesh and protective covers.

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Technical Specifications

Each well, typically about 12 feet deep, was sited after rigorous geological and GIS‑based assessments that identified locations with high recharge potential, favorable runoff patterns, available open space and feasible maintenance logistics.

Digital Monitoring Platform

The BDA also unveiled GreenBengaluruByBDA.in, an online portal to track greening initiatives, monitor sapling health, manage maintenance, and provide volunteering opportunities and citizen query handling.

Why This Matters

BozokMedia analysis shows that Bengaluru’s rapid urban expansion has outpaced natural recharge zones, making projects like these crucial for long‑term water sustainability and climate resilience.

“Every drop we recharge today fortifies Bengaluru’s tomorrow,” said water expert Dr. Anjali Singh.
Did You Know?: Each percolation well can replenish roughly 128,000 litres of water per year – enough to meet the five‑year water demand of an average household.

Frequently Asked Questions

Q1: How many percolation wells were installed?

A: 1,441 wells.

Q2: Who will be responsible for their maintenance?

A: The respective BDA authorities have been tasked with ongoing upkeep and monitoring.