A rectangular, sharp-crested weir with end contractions is 1.4 m long. How high should it be placed in a channel to maintain an upstream depth of 2.35 m for 0.40 m³/s flow

A contracted from the two ends sharp-crested weir is installed in a channel and has a crest heigh of 7.2 m and a crest effective length of 4 m. The discharge coefficient (Cd) is 1.81. At design flow, a 1.1 m static head develops upstream of the weir. Determine the crest height of a non- contracted-90°-V-notch (replacement) weir with Cd =2 that would discharge the same design flow rate without raising the upstream flow depth in the channel. Y

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

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