For an open rectangular channel, the Froude number at critical flow is equal to:

Hydraulically most efficient rectangular open channels are designed primarily to:

Which of the following statements are true/false regarding the most economical trapezoidal channel? Statement 1: The most efficient section for a trapezoidal channel is a half-hexagon. Statement 2: For the most efficient trapezoidal section, the length of the sloping side should be equal to half of the top width.