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Higher Study | Fluid Mechanics | Open Channel Flow

How many types of weirs are there based on the shape of the crest?
Water hammer pressure is relieved by
In case of depressed nappe the pressure of air below the nappe is
The weir with thick crest is known as
When the crest length of the weir equals the width of the channel, on which water flows, the number of end contractions 'n' in Francis formula will be
When perimeter is minimum, discharge is:
Statement (I): Open channel flow in a channel is said to be critical when the specific force is maximum for a given discharge. Statement (II): Direct integration for steady non-uniform flow by Bresse’s method was developed for very wide rectangular channels.
When the water in a channel is flowing at critical velocity
Consider the following statements with respect to weir under discussion: 1. Its design corresponds to soft sandy foundation. 2. The difference in weir crest and downstream river bed may not exceed 3. When water passes over it, the longitudinal location of the formation of a hydraulic jump is variable. This weir is of the type
A hydraulic jump is formed when 
When there is no air left blow the nappe, it is known as
For an accurate flow measurement in open channel, an arrangement for aeration under the nappe is necessary when the weir used is:
When the depth of water in an open channel is greater than the critical depth then flow is said to be
The most economical section of circular channel for maximum discharge is obtained when (Where, d is the diameter of circular section)
Uniform flow in an open channel exists when the:
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