A small southern California town wants to construct some playing fields on the floodplain adjacent to a nearby river. The main river channel is nearly rectangular and 14 ft. deep, 360 ft. wide, and consists of earth with some grass (n=0.026). The floodplain, on the other hand, consists of tall grass (n=0.035) and extends 695 feet from the edge of the main channel to some vegetated, vertical bluffs (i.e. steep hills) on each side. The channel bed drops about 2.64 ft per mile. (a) Compute the uniform flow depth for the 50-year flood of 51,501 cu. ft/sec. (b) Compute the discharge (Q) and the average velocities (V) in the main channel and in each of the overbank (floodplain) reaches for the 50-year flood. (c) If the town needs 200 yards next to the bluffs on each side of the river to build the playing fields, at approximately what height should vertical levees be constructed to prevent the 50-year flood from inundating the fields. List any assumptions made. *Please start by drawing a dimensioned figure*
A small southern California town wants to construct some playing fields on the floodplain adjacent to a nearby river. The main river channel is nearly rectangular and 14 ft. deep, 360 ft. wide, and consists of earth with some grass (n=0.026). The floodplain, on the other hand, consists of tall grass (n=0.035) and extends 695 feet from the edge of the main channel to some vegetated, vertical bluffs (i.e. steep hills) on each side. The channel bed drops about 2.64 ft per mile.
(a) Compute the uniform flow depth for the 50-year flood of 51,501 cu. ft/sec.
(b) Compute the discharge (Q) and the average velocities (V) in the main channel and in each of the overbank (floodplain) reaches for the 50-year flood.
(c) If the town needs 200 yards next to the bluffs on each side of the river to build the playing fields, at approximately what height should vertical levees be constructed to prevent the 50-year flood from inundating the fields. List any assumptions made.
*Please start by drawing a dimensioned figure*
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