Flow Over Notches and Weirs

What is a notch?

• A device used to measure the rate of flow of a liquid through a small channel or tank

• An obstruction in an open stream over which flow takes place

• The sheet of water flowing through a notch or weir

• The top of the weir where water flows

What is a weir?

• The sheet of water flowing through a notch or weir

• An obstruction in an open stream over which flow takes place

• A device used to measure the rate of flow of a liquid through a small channel or tank

• The top of the weir where water flows

What is the formula for discharge over a rectangular notch or weir?

• Q = (1/2)Cd.A.v

• Q = Cd.d.L^2.g.H^(3/2)

• Q = (8/15)Cd.2g.tan(θ).H^(5/2)

• Q = (2/3)Cd.d.L^2.g.H^(3/2)

What is the apex of a notch?

• The sheet of water flowing through a notch or weir

• The top of the weir where water flows

• The vertex of the triangular notch where angle originates

• The device used to measure the rate of flow of a liquid through a small channel or tank

What is the discharge coefficient represented by 'Cd' in the formula for discharge over a notch or weir?

• Coefficient of Drag

• Coefficient of Diameter

• Coefficient of Discharge

• Coefficient of Density

What is the function of a notch?

• To generate electricity

• To store water for later use

• To obstruct the flow of water in a river or stream

• To measure the rate of flow of a liquid through a small channel or tank

What is the velocity of approach in the context of notches and weirs?

• The velocity with which the water approaches or reaches the weir or notch before it flows over it

• The speed at which water flows over the weir

• The velocity of water exiting the weir

• The velocity of water at the base of the weir

What is the purpose of a weir?

• To store water for later use

• To generate electricity

• To obstruct the flow of water in a river or stream

• To measure the rate of flow of a liquid through a small channel or tank

What is the formula for calculating the volume of water flowing through a triangular-shaped pipe?

• Q = Cd.d.L^2.g.H^(3/2)

• Q = (1/2)Cd.A.v

• Q = (2/3)Cd.d.L^2.g.H^(3/2)

• Q = (8/15)Cd.2g.tan(θ).H^(5/2)

What is the sill or crest in the context of notches and weirs?

• The height of water above the sill

• The top of the weir where water flows

• The vertex of the triangular notch where angle originates

• The device used to measure the rate of flow of a liquid through a small channel or tank