In flowing from section (1) to section (2) along a rectangular open channel, the water depth decreases by a factor of three and the Froude number changes from a subcritical value of 0.7 to a supercritical value of 3.4. Determine the channel width at (2) if it is 8 ft. wide at section (1). Assume stead-state flow.

A circular corrugated-metal water channel has a slope of1:800 and a diameter of 6 ft. (a) Estimate the normal discharge,in gal/min, when the water depth is 4 ft. (b) For thiscondition, calculate the average wall shear stress.

Q4: The flow is occurring in a rectangular channel at a velocity of (571/500) m/sec and a depth of 0.2 m. Neglecting the effect of the velocity of approach & applying the relation; Q=1.84*L*H3/2, Analyze that what should be the height of a sharp-crested weir that mustbe installed to raise the water depth upstream of the weir to 1.2 m.

7. A long triangular open channel with two different side slopes, these are: 2:1 and 3:1 (H: V). The Manning coefficient is 0.014. The longitudinal bed slope =0.004, this channel is converted to the best economic section by using the same amount of material at depth 1.5m in the old section. The old and new flow discharges in m3/s (respectively) are: 9.9 & 57.5 29.8 & 67.3 20.5 & 14.5 19.9 & 37.3 None