QUESTIONS
What is the difference between flow depth d
and hydraulic depth D?
The flow depth d
is the distance from the water surface
to the channel bottom. It has particular application to trapezoidal or rectangular channels,
where it is a constant. The hydraulic depth D is the ratio of flow area A
to top width T. In a rectangular hydraulically wide channel, d and D
are approximately the same.
PROBLEMS
Derive the expression for the angle θ
in a circular channel (culvert) as a function of flow depth y and diameter
D, where D = 2r (Fig. 114).
Fig. 114 Definition sketch for a circular channel.


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