Example 2.1 Flow is occurring in a rectangular channel at a velocity of 0.9m/s and a depth of 0.3m. Neglecting the effect of velocity of approach, determine the height of a sharp-crested suppressed weir that must be installed to raise the water depth upstream of the weir to 1.2m. Example 2.2 Uniform flow occurs in a long rectangular channel 4m wide at a depth of 2m. The channel is laid on a slope of 0.001 and the Manning coeff is 0.025. Determine the minimum height of a low weir that can be built on the floor of this channel to produce critical depth. Example 3.2 The rectangular siphon shown has a constant cross section of 1m x 1m and is 40m long. The distance between the entrance and the crown is 10m. The friction factor f = 0.025, the inlet coeff = 0.1, the bend loss coeff = 0.8 at the crown, and the exit loss coeff = 1.0. Determine the discharge and the pressure head at the crown section. 2 m m\\ 1 mn 3 mn