Question

why is it necessary to stop rain water answer in one sentence​

Answer 1

Answer:

Mains water is a precious resource due to increases in demand from our ever growing population. ... Rainwater harvesting can provide around 50 per cent of a family's water needs. This not only saves water, but saves money and reduces our impact on the environment.

Answer 2

It reduces soil erosion and flood hazards by collecting rainwater and reducing the flow of stormwater to prevent urban flooding.