15 cumecs, the depth d and width are related by For drains up to A. d = 0.2 B B. d = 0.5 B C. B = 0.2 d D. B = 0.5 d

The correct answer is: A. d = 0.2 B

The discharge of a drain is the volume of water that flows through it per unit time. It is measured in cubic meters per second (cumecs). The depth of a drain is the vertical distance from the top of the drain to the bottom. The width of a drain is the horizontal distance from one side of the drain to the other.

The discharge of a drain is related to its depth and width by the following equation:

$Q = \frac{1}{2} B d^2$

where:

• $Q$ is the discharge of the drain (in cumecs)
• $B$ is the width of the drain (in meters)
• $d$ is the depth of the drain (in meters)

For a drain with a discharge of 15 cumecs, the