A cipolleti weir is constructed across a trapezoidal channel. The discharge is estimated to be 3.50 m³/s with a head not exceeding 0.50 m. Find the crest length.

a rectangular suppressed weir is placed on the side of a reservoir whose plan area is a constant 1034m^2. When the weir is opened the flow reaches elev 5.13m eventually it reaches 4.88m If the crest is situated at 4.46 when the wier is opened how long does it take to lower the depth flow to 4.88m? the weir is 2m long and has c=0.61

4) Find the discharge of the rectangular, sharp-crested, two-stage weir show below. Assume P = 3ft for the lower crest and that the upper crest touches the edges of the channel it is in.

The flow rate of water in a 3-m-wide horizontal open channel is being measured with a 0.25-m-high sharp-crested rectangular weir of equal width. If the water depth upstream is 0.9 m, the flow rate of water is(a) 1.75 m3/s (b) 2.22 m3/s (c) 2.84 m3/s(d) 3.86 m3/s (e) 5.02 m3/s