Determine the discharge, in L/s, over the weir having a head of 0.30 m if a a contracted rectangular sharp crested weir 2 m long is used.

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

4. Determine the discharge of the weir having a head of 1.5 m (in L/s). C = 0.61 A) If V-notch were used, 0 = 75° B) If a trapezoidal weir with sides inclined 10° with the vertical and a length of crest is 3 m C) If a rectangular weir 2 m long is used

A sharp-crested suppressed rectangular weir 1m long and a standard 90- degree V-notch weir are placed in the same weir box with the vertex of the V- notch weir 150mm below the crest of the rectangular weir. Determine the head on the rectangular weir. Determine the head on the rectangular weir when their discharges are equal. Use Francis Formula.