The conveyance of a channel section of a given area increases with a decrease in its perimeter. Hence a channel section having the minimum perimeter for a given area of flow provides the maximum value of the conveyance. With the slope, roughness coefficient and area of flow fixed, a minimum perimeter section will represent the hydraulically efficient section as it conveys the maximum discharge. This channel section is also called the best section. Proportions of some most efficient sections is given in Table
Where,
n : Manning’s Coefficient
e subscript : most efficient
Ye : Depth of flow for the most efficient section in m
Qn : Discharge in m3/sec
So : Bed slope
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Urban Infrastructure and Network Study notes for M. plan Sem-III
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