“The ideal solution of depleting ground water resources in India is water harvesting system.” How can it be made effective in urban areas? (Answer in 250 words)

Urbanisation replaces permeable soil with concrete, accelerates runoff and intensifies groundwater extraction. Rainwater harvesting can recharge aquifers and reduce dependence on piped and borewell supplies, but it must be hydrogeologically planned.

Making it effective

• Mandate rooftop harvesting, recharge pits and storage in new buildings, with designs suited to local rainfall, aquifer depth and water quality.
• Retrofit existing colonies, schools, markets and public buildings; use parks, medians and open spaces for infiltration where safe.
• Separate first-flush water, filter contaminants and prohibit recharge where groundwater is polluted or saline.
• Restore urban lakes, wetlands, drainage channels and permeable surfaces to retain stormwater rather than channel it away.
• Combine harvesting with metering, groundwater budgeting, regulated extraction and wastewater treatment for non-potable reuse.

Institutions and incentives

• Urban local bodies should map aquifers, approve plans, inspect systems and publish groundwater data.
• Property-tax rebates, user charges, penalties for non-compliance and community maintenance can create durable incentives.
• Resident associations, technical institutions and private operators should share responsibility for operation and monitoring.

Water harvesting is not a stand-alone cure. Its success depends on scientific siting, maintenance, demand management and basin-level urban planning.

Keywords: aquifer recharge; sponge-city planning; urban lakes; first-flush; groundwater budgeting.