Revision summary
City aquifers fall because pumping is high and paved catchments block recharge. Harvesting of roof and plot rain, plus lake revival, is the fitting structural reply. Urban success needs bye-law checks, silt traps, storm–sewage separation, and greywater reuse. Public plots must lead, and slums need community catchments, not only private roofs. Harvesting complements, but does not replace, bulk river and reuse systems in a drought year.
Model answer
Flow diagram
flowchart TD R[Urban rain] --> H[Roof plot lake harvest] H --> A[Recharge aquifer] P[Paving sewage mix] --> L[Runoff flood depletion] B[Bye-laws meters RWAs] --> H A --> S[Less tanker and deep pumping]
Conclusion
- Tie floor-area permission to a working recharge test, restore urban lakes as infrastructure, and publish ward-wise groundwater depth so harvesting is scored like any other civic work.
Water harvesting is the sound urban answer to falling groundwater if roofs, pits, lakes, and clean storm drains work together. Effectiveness is enforcement, desilting, sewage separation, and fair access in slums, not a one-time pipe on an elite terrace.
Quick related
Students also ask
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Defining blue revolution, explain the problems and strategies for pisciculture development in India.
Next question in the 2018 paper (Q15). View answer →
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Is rooftop harvesting enough for a whole city?
It is necessary on every large roof. Lakes, drains, and reuse must sit with it, or aquifers still fall.
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Why do many urban pits fail?
Silt, no desilting, and mixing with sewage. A pit is a system that needs a caretaker, not only a sanction drawing.
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