1.2 m n2 n3 2.35 m 2 ni 12 m 15 m 4 m 10m 15 m 2 m Figure 1 2.
A channel section which is composed of different roughness along the wetted perimeter is called a composite section whereas a compound channel is a channel consisting of a main channel carrying base flow, and a floodplain on one or both sides that carries overbank flow during times of flooding. Consider the composite compound channel given in Figure 1. The Manning’s roughness coefficients are given as n1, n2 and n3 where the channel are naturally made channel with stones and weeds, tall grasses and reeds, and light brush respectively. The channel bed slope for the whole channel is 0.9%.Determine the discharge passing through the cross section of the compound –composite channel. Use the Horton’s Method to determine the neq.
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