Question: water approaches a sharpcrested rectangular weir through a channel that...

Water approaches a sharp-crested rectangular weir through a channel that is 2 m wide. The depth of flow in the channel is 1 m. The weir crest is 0.6 m above the base of the channel and has a crest width of 0.8 m. It is located in the centre of the channel.

Assuming a coefficient of discharge of 0.61, and ignoring side contractions, determine the discharge over the weir:

a)      Assuming the approach velocity is zero                                                           [4 marks]

b)      Including the approach velocity (iterative procedure)                                      [6 marks]