Tackling the Issues with Rainwater Harvesting

• Context (DTE): Despite mandating rainwater harvesting (RWH) in all three mega-cities (Delhi, Bengaluru, Chennai) implementation struggles persist. This has led these cities towards Day Zero.

Measures taken to Install rainwater harvesting systems in the three mega-cities

• Bengaluru has mandated rainwater harvesting in residential colonies since 2010.
  • In 2021, the Bangalore Water Supply and Sewerage Board (BWSSB) made it mandatory for buildings on sites measuring 60×40 feet and more.
• Chennai Metropolitan Development Authority (CMDA) mandated rainwater harvesting system designs in building plans since 2002.
• Delhi Jal Board (DJB) enforced RWH systems since 2012, with penalties for non-compliance and financial incentives for adhering to regulations.
  • DJB offers financial assistance up to Rs 50,000 and a 10% water bill rebate for residents with adequacy certificates for their rainwater harvesting systems.

Challenges in implementing rainwater harvesting systems

• Communities are losing interest due to a lack of space and high installation costs.
• Weak enforcement and insufficient monitoring.
• Inadequate awareness and support for maintenance.
• Insufficient measures to prevent sewage contamination.

What needs to be done?

• Focus on community-level rainwater harvesting due to limited land availability for household RWH.
• Provide technical assistance and raise awareness about rainwater harvesting.
• Rejuvenating traditional rain harvesting structures like lakes, ponds, and temple tanks.
• Stringent guidelines for rainwater harvesting installation and maintenance, including piezometers for groundwater monitoring (National Green Tribunal Committee).
• City water authorities should conduct regular monitoring of structures and their impact.
• Implement both incentives and penalties to encourage communities to build effective RWH systems.