How does rainwater help a city to cope with water crisis?
Most cities have a water tower. This is where the water supply
for a city or town is held. When it rains, it is collected in the
water tower and filtrated into the city water line. When there is a
water crisis, people are advised to use as little of water as
possible, because they share water through the water tower. So when
they run out, absolutely no one has water in the city.