Question

In Water treatment plants , water is allowed to stand undisturbed in large water tanks . Why?

Answer 1

For its sedimentation.. here dirt particles, sands etc settle down and water is free from any of these impurities.

Answer 2

In water treatment plant water is allowed to hold in big tank because this help to settle the waste & dirt in the bottom .

This tank have some pipes which pour chemicals like chlorine etc in dirt water and this dirt get purified

I hope this will help you

Thank you