Find the discharge over a broad crested weir with a breadth of 18", a length of 6' and a head of 1.6 feet.

the river flow passes through a 2.08 wide rectangular sharp crested weir. If the water level several meter upstream is 1.4 m what is the discharge (m^3/s) over the weir given that the flow reaches 0.1m above the crest? assume cw=0.637 and do not consider the velocity approach

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.

Determine the required length of a contracted weir similar to that shown in Fig. 14.17(b) to pass 15 ft³/s of water. The height of the crest is to be 3 ft from the channel bottom, and the maximum head above the crest is to be 18 in.