A culvert is designed for a flood frequency of 100 years and a useful life of 20 years. The risk involved in the design of the culvert is in percentage?

1. What is the chance that the culvert designed for an event of 95-year return period will have its capacity exceeded at least once in 50 years?

A culvert is designed to pass a 50-year storm runoff, and it is designed for a 40 year life. What is the hydrologic risk of failure during the 40-year project life? A.2% B.55% C.64% D.82%

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?