Question

Why is a closed drainage system preferred over open drainage system?

• A. Closed drainage is cheaper to build than open drainage.
• B. Closed drainage prevents human exposure to harmful waste.
• C. Cleaning of closed drainage is easier than open drainage.
• D. No wastewater treatment is needed for closed drainage.

Answer 1

The correct option is B Closed drainage prevents human exposure to harmful waste.

Wastewater flowing through drainage also contains bacteria and other disease causing microbes. Open drainage system consists of uncovered channels due to which it becomes a breeding place for mosquitoes.

The purpose of closed drainage is to prevent direct exposure of harmful waste to humans. Closed drainage systems can prevent the accumulation of stagnant water, thus avoiding mosquitoes breeding.