The document discusses water management issues in Mumbai, India. It notes that Mumbai receives around 2000 mm of annual rainfall but only 20% is used for drinking and cooking while over 60% is used for bathing, washing, and flushing toilets. Much of this water is wasted as 80% of water ends up as wastewater with only 24% being treated before disposal. It recommends that rainwater harvesting be implemented more widely, as harvesting from 70% of roofed areas could provide around 589 MLD of water, compared to upcoming projects of 455 MLD. For better water management, it emphasizes the importance of public education, legislation, and citizen participation in making water conservation their business.

2. Once consisted of group of seven islands called Colaba, Mazagaon, Old woman’s Island, Wadala, Mahim, Parel and Matunga – Sion .

3. Vehar lake Tulsi Lake Tansa Dam Vaitarna

8. The amount that goes ‘unaccounted for’… About 20 to 25 per cent is lost in leakage and pilferage.

9. GROUNDWATER QUALITY… SEA WATER INTRUSION – Colaba, Dharvi, Khar, Anderi, Chembur, Malad etc. INDUSTRIAL POLLUTION – Greater mumbai area ( High Nitrate, trace elements like Cu, Cr, Hg etc are found in water) Source: Central Ground Water Board

10. MIDDLE VAITARNA STILL WAITING FOR CLEARENCE

14. Area – 437 sq kmts Annual avg .rainfall – 2000 mm Potential - 2394.52 MLD Present water supply = 2900 MLD Options:Storage;recycling; and recharge Even if we assume 70 % of the area to be developed, 50 % of it to be roofed and we collect 70 % of the water falling over it, the quantity of rainwater that can be harvested works out to 589.34 MLD. This is a sizeable quantity compared to water supply to Mumbai. It may also be reminded that the Middle Vaitarna project is for 455 MLD. WATER HARVESTING POTENTIAL OF MUMBAI

15. SUCCESS STORIES IN MUMBAI… BEST BUS DEPOT TATA INSTITUTE OF SOCIAL SCIENCE