Closure to 'Most Hydraulically Efficient Standard Lined Canal Sections' by David C. Froehlich

摘要

Vantankhah's ingeniously neat simplification of Eq. (20) is greatly appreciated. He also points out that when comparing optimal sections (that is, the shapes that require the least flow area for a specified value of (1), there is little difference between type Arning from 0 to 1 is shown in Fig. 1. Vantankhah further shows that the difference remains small when the side-slope ratio (horizontal to vertical) m is specified as long as m>0.4. For these reasons, the general section shape (given by the value of k) can be selected based on economic considerations, local preferences, or other criteria, such as constructability issues.