एक खुले चैनल प्रवाह (open channel flow) में, वैकल्पिक गहराइयों (alternate depths) को प्रवाह की उन दो गहराइयों के रूप में परिभाषित किया जाता है:

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.