CE 451 Water Resource Engineering
4/21/2010
Home Work #9
10.14.
Water flows steadily at 16.0 cfs in a very long triangular flume that has side slopes
1 on 1. The bottom of the flume is on a slope of 0.0035. At a certain section A the depth
of flow is 2.00 ft. Is the flow at the section subcritical or supercritical? At another section
B, 200 ft downstream from A the depth of flow is 2.5 ft. approximately what is the value
of Manning’s n? Find y
n
. Under what conditions can this flow occur?
10.17
. The flow in a long 12ftwide rectangular channel that has constant bottom slope is
870 cfs. A computation using the manning equation indicates that the normal depth of
flow for this flow rate is 6.3 ft. At a certain section A the depth of flow in the channel is
4.0 ft. will the depth of flow increase, decrease, or remains the same as one proceeds
downstream from section A? Sketch a physical situation where this type of flow will
occur.
10.23.
A rectangular drainage channel is 16 ft wide and is to carry 500 cfs. The channel is
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 Spring '07
 Lee
 Water Resource Engineering, normal depth, long triangular flume

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