(b) A 3.5 m wide rectangular channel has Manning's roughness coefficient of 0.016 and longitudinal slope of 1 in 800. The channel carries discharge of 15 m/s. If a 0.7 m-high broad-crested weir is constructed at the middle of the channel, detemine (i) Depth of flow far upstream of the weir, and (ii) Depth of flow just upstream of the weir. Prove that the specific energy equation can be reduced to Fr = 1 for critical flow condition. (c)

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(b)
A 3.5 m wide rectangular channel has Manning's roughness coefficient of 0.016
and longitudinal slope of 1 in 800. The channel caries discharge of 15 m/s. If a
0.7 m-high broad-crested weir is constructed at the middle of the channel, determine
(i) Depth of flow far upstream of the weir, and
(ii) Depth of flow just upstream of the weir.
(c)
Prove that the specific energy equation can be reduced to Fr = 1 for critical flow
condition.
Transcribed Image Text:(b) A 3.5 m wide rectangular channel has Manning's roughness coefficient of 0.016 and longitudinal slope of 1 in 800. The channel caries discharge of 15 m/s. If a 0.7 m-high broad-crested weir is constructed at the middle of the channel, determine (i) Depth of flow far upstream of the weir, and (ii) Depth of flow just upstream of the weir. (c) Prove that the specific energy equation can be reduced to Fr = 1 for critical flow condition.
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