“The ideal solution of depleting ground water resources in India is water harvesting system.” How can it be made effective in urban areas ?
Approach · directive: “how”
What it asks · Explain how rainwater harvesting and recharge can be made to work in cities, while noting that harvesting alone does not solve groundwater depletion.
The question has 3 parts — answer each
- Examine the premise: what water harvesting can do against urban groundwater depletion, and why it is necessary rather than sufficient
- How it can be made effective in urban areas: mandate and enforcement, incentives, recharge works, water bodies, science-based planning, community and monitoring
- What must accompany harvesting: demand management and wastewater reuse
Open with · Cities pump groundwater heavily while roofs and roads shed rain into drains, so harvesting can recharge aquifers only if it is designed, enforced and maintained well.
Cover
- Mandate and enforce: make rooftop harvesting compulsory in building bye-laws and link approvals and occupancy certificates to working systems; Tamil Nadu's 2003 rule is an example.
- Incentives and finance: property-tax rebates, subsidies for retrofitting, municipal and CSR funds, with priority for government buildings and large complexes.
- Recharge works: recharge pits and wells, percolation trenches, permeable pavements and rain gardens in parks and roads; connect stormwater drains to recharge points to cut flooding.
- Revive water bodies: protect lakes, tanks and stepwells and their catchments from encroachment, since they store and recharge water naturally.
- Science and planning: aquifer mapping (NAQUIM) and local hydrogeology decide where recharge works; rainwater needs first-flush filters and regular maintenance to stay clean.
- Community role and monitoring: resident welfare associations, awareness drives, sensors and public dashboards to track working systems and groundwater levels.
- Beyond harvesting: regulate borewells through the Central Ground Water Authority and State laws, price water sensibly, cut network leakage and reuse treated wastewater.
Close with · Rainwater harvesting can recharge urban aquifers only with enforcement, maintenance and local design, and must be paired with demand management and wastewater reuse.
Question: UPSC's CS (Main) 2018, GS Paper I — paper ↗. Approach: Minimalist IAS, checked 30 Sept 2026 (how we verify) — UPSC publishes no model answers. ·
Model answer · 271 words (UPSC limit 250) · Minimalist IAS
Cities pump groundwater heavily while roofs and roads shed rain into drains; harvesting can turn that runoff into recharge, but only if it is designed, enforced and maintained well.
Harvesting as the solution
- Rainwater harvesting captures rooftop and surface runoff for storage or aquifer recharge, cutting demand on borewells and reducing urban flooding at the same time.
- It is necessary rather than sufficient: unregulated extraction, leaking networks and wasteful use keep depleting aquifers unless harvesting is paired with demand control.
Making it effective in cities
- Mandate and enforce: make rooftop harvesting compulsory in building bye-laws and link approvals and occupancy certificates to working systems; Tamil Nadu made it compulsory in 2003.
- Incentivise: property-tax rebates and subsidies for retrofitting older buildings, with government offices and large complexes leading.
- Recharge works: recharge pits and wells, percolation trenches, permeable pavements and rain gardens in parks and along roads; connect stormwater drains to recharge points.
- Revive water bodies: protect lakes, tanks and stepwells and their catchments from encroachment, since they store and recharge water naturally.
- Plan on science: aquifer mapping (NAQUIM) and local hydrogeology should decide where recharge structures go; first-flush filters and regular cleaning keep recharged water clean.
- Community and monitoring: resident welfare associations, awareness drives, sensors and public dashboards to track working systems and groundwater levels.
Beyond harvesting
- Regulate borewells through the Central Ground Water Authority and State groundwater laws, price water sensibly, cut network leakage and reuse treated wastewater for non-drinking needs.
Rainwater harvesting can recharge urban aquifers only with enforcement, local design and upkeep, and it becomes a real answer to depletion when demand management and wastewater reuse stand alongside it.
Written by Minimalist IAS from facts checked at source (how we verify). UPSC publishes no model answers: compare your structure and coverage with this, then write your own.