1.5
2
3
4
Answer is Right!
Answer is Wrong!
The correct answer is B. 2.0.
The ratio of maximum sewage flow to average sewage flow for trunk mains having diameters more than 1.25 m is 2.0. This means that the maximum flow of sewage in a trunk main with a diameter of more than 1.25 m is twice the average flow. This is because trunk mains are designed to handle peak flows, which can be much higher than the average flow.
The other options are incorrect. Option A, 1.5, is too low. Option C, 3.0, is too high. Option D, 4.0, is also too high.
The ratio of maximum sewage flow to average sewage flow is important because it affects the design of trunk mains. Trunk mains need to be able to handle peak flows without overflowing. The higher the ratio, the larger the trunk main needs to be.