A rectangular channel with a bottom slope of 0.0004 is to be built to transport water at a rate of 1500 ft3/s. Determine the best dimensions of the channel if it is to be made of (a) unfinished concrete and (b) finished concrete.

A trapezoidal channel has a base of 2 m and 45-degree walls. A smooth asphalt lining is used and the channel slopes at 2.5%. If the water speed is measured at 10 m3/s, what is the water depth in the channel?

An elliptical culvert is 4.5 feet tall and 6.9 feet wide it is filled with water to a depth of 1.05 feet.  Find the width of the stream.

1. In the upstream portion of a river, it has a rectangular channel 10m wide and 1.2m deep of water flowing with a mean velocity of 0.75 m/s. Determine the height (head H) in meters of a standard rectangular weir considered without contraction at the downstream portion, if the length of weir is half of the upstream channel width. 2. The river is measured through float method. It has a length marking of 10 meters. Trials were made for 10 times and tabulated the following recorded time in seconds: 12.4 15.5 16.8 17.1 14.9 14.4 16.6 17.2 18.2 15.8 Estimate the flow rate in m3/s of the river if the mean velocity is 75% of the maximum velocity at the top surface. The cross-section area of the channel is close to 15m x 2m.

A 6.0 m rectangular channel carries a of 30 m³/s at a depth of 2.5 m. the channel width that produces discharge Determine the critical depth.