We should have rain water harvesting for all buildings in mumbai, should it be made mandatory?

Question

we get so much of rain that goes down the drain. why not we all try and save this water by rain water harvesting so that we could consume this water may be for washing clothes or utensils. There are many villages where there is no rain, farmers commit suicides so are youll on the line with me........

Answer 1

the rain water is not going thru the drain in Mumbai, it is on the streets, flooding every where.

rain water harvesting is must and should be made mandatory.

it will solve the water shortage problem and flooding problem.

politics must be kept away from water.