The most economical section of a rectangular channel is one in which the hydraulic mean depth is equal to:
Options:
Explanation:
In an economical (most efficient) rectangular channel section, the hydraulic mean depth (also called hydraulic radius) is equal to half the depth of flow (d/2). This condition provides maximum discharge for a given cross-sectional area, minimizing the wetted perimeter and therefore frictional losses.
Answer:
The most economical section of a rectangular channel is one in which the hydraulic mean depth is equal to: d/2.
