Question

In which of the following units, design period is maximized?

(a) Distribution system

(b) Demand reservoir

(c) Water treatment unit

(d) Pipe mains

The question was posed to me in a job interview.

Question is from Water Demand topic in portion Water Demand and Quantity of Environmental Engineering

Answer 1

Correct choice is (b) Demand reservoir

The explanation is: Distribution system is designed for 30 years, the demand reservoir for 50 years, the water treatment unit for 15 years and the pipe mains for 30 years.

A B C D

1 2 3 4

2 3 4 1

2 1 4 3

1 2 4 3