I think many cbuildings will
collect rainwater and then use
: it in various ways. I I.
have two reasons. Firstly, they
can cut down costs. Thesedays,
Utility bills is very expensive,
so many buildings pay for
it. If they can save
rainwater, they will cost symall
bills for water. Secondly it
is good for environment to
do it. Recently, It's short of
water, so they should use
water efficiently. Therefore, may
buildings will collect vainwater to
Save costs and protect environment.