rainwater harvesting Mumbai - Geography Ebooks | TheGeoecologist

Question 1

Why does Mumbai face water cuts despite heavy monsoon rainfall?

Accepted Answer

Mumbai relies on seven distant lakes 100+ km away in catchment areas where rainfall may be deficient even when the city floods. Additionally, 27% of treated water is lost to leaks and theft, and concretization prevents local aquifer recharge.

Question 2

What is the current Non-Revenue Water (NRW) loss in Mumbai's supply system?

Accepted Answer

According to BMC's 2023-24 Environmental Status Report, Mumbai's NRW stands at 27.3%, meaning roughly 1,000 million litres per day of treated water never reaches paying consumers due to aging pipes, illegal connections, and metering gaps.

Question 3

How can Mumbai achieve water security by 2035?

Accepted Answer

A five-pillar strategy can close the gap: (1) enforce mandatory rainwater harvesting on all plots >100 sq m, (2) recycle 1,000 MLD of wastewater for non-potable use, (3) replace priority pipelines with smart-metered networks to cut NRW to 15%, (4) establish a cross-district catchment conservation authority, and (5) delink water connections from property titles to ensure universal access.

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