What is a crump weir?

Crump weirs are control structures. They are broad-crested weirs. The triangular shape of the weir has several advantages, e.g. only minor siltation occurs upstream of the weir. Crump with defined inclinations both upstream and downstream. The Crump weir is preferably used as a sill.

Does CD increase or decrease with increasing flow rate?

The obtained results show that Cd values will increase with increasing flow rate as well as with decreasing in crump height; an increase in surface roughness of crump weir can makes great reduction in Cd value.

What is non modular flow?

Non-Modular Flow occurs when the weir operates drowned, with downstream water level high (Figure 2). In this condition, a single measurement of upstream head is not adequate to determine the actual flow because the upstream head is affected by changes in the downstream head.

Why weir must be broad?

Head-discharge relationship When the length, L, of the crest is greater than about three times the upstream head, the weir is broad enough for the flow to pass through critical depth somewhere near to its downstream edge. Consequently this makes the calculation of the discharge relatively straightforward.

Does the height of the weir affect the discharge coefficient?

Results revealed that the discharge coefficient of the weir increases with the increase in inclination of the weir plane.

What is narrow crested weir?

To lift small quantity of water to a greater height when a large quantity of water is available at a smaller height.

What is a Cipolletti weir?

: a weir that is trapezoidal in shape with the sides inclining outward from the base.

How do you escape a weir?

Water falls over the weir, drives to the bottom of the riverbed, bounces back up and then rejoins the downward flow at the top. These circulating stoppers can be aggressive and impossible to escape. You can try to swim down or sideways to and exit the circuit, and then rise to the surface.