The outlet structure for a stormwater detention pond consists of a broad-crested weir for the design flood overflow. It has a crest height of 8.0 ft above the bottom of the pond. The head on the weir cannot exceed 2.0 ft at the maximum outlet discharge of 400cfs. Calculate the required crest length of the weir.

The Peripheral overflow weir of a settling tank has 60 identical 90 degree V notch weirs, all set in the same apex level.if the daily flow rate is 1296m3 fine the flow over an individual V notch in L/s

During major flood events water flows over the top of a roadway. (a) Determine the head (H) on the broad-crested weir for a discharge rate of 15,000 cfs if the overflow section of roadway is horizontal and 500 ft long. Assume a discharge coefficient of 0.33. (b) Assume that a vehicle stalled on the roadway will be washed off the roadway into the downstream channel if the water depth exceeds 4.0 ft. Compute the water depth and velocity on the roadway. Will a stalled vehicle on the roadway remain on the road during the flood?