Question

why do we need an effective drainage system ​

Answer 1

Answer:

This is the most important use of a good drainage system; it allows the free flow of water and in most cases prevents accumulation that can lead to flooding. Drainage systems also prevent the accumulation of stagnant water, which can encourage mosquitoes to breed

Answer 2

Answer:

We need an effective drainage system because to keep water safe for some reason such as

To prevent accumulation of stagnant water for some disease such as malaria,worms etc