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1. A gravel bed river with large boulders carries a flood discharge of 190,000 cfs during a 100- year flood event. It has a bed slope of 0.0015, with side slopes of 1:1, and the overbank areas are covered with short grass. Find the minimum design elevation of the crest of the levees on both banks (with a freeboard of 3 ft.). The elevation of the flood plain area is 820 ft.

1. A gravel bed river with large boulders carries a flood discharge of 190,000 cfs during a 100- year flood event. It has a bed slope of 0.0015, with side slopes of 1:1, and the overbank areas are covered with short grass. Find the minimum design elevation of the crest of the levees on both banks (with a freeboard of 3 ft.). The elevation of the flood plain area is 820 ft.

Structural Analysis
Structural Analysis
6th Edition
ISBN:9781337630931
Author:KASSIMALI, Aslam.
Publisher:KASSIMALI, Aslam.
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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1. A gravel bed river with large boulders carries a flood discharge of 190,000 cfs during a 100- year flood event. It has a bed slope of 0.0015, with side slopes of 1:1, and the overbank areas are covered with short grass. Find the minimum design elevation of the crest of the levees on both banks (with a freeboard of 3 ft.). The elevation of the flood plain area is 820 ft. Levee 250ft 25ft 4 Elevation 820 ft 250ft Figure 1 25ft 250ft Levee 2. If a bridge is to be built across this section (Figure 1) with embankments on both abutments. Find minimum width of the channel formed as a bridge opening that would meet the criteria in the definition of floodway (if a foot rise over is allowed).
Transcribed Image Text:1. A gravel bed river with large boulders carries a flood discharge of 190,000 cfs during a 100- year flood event. It has a bed slope of 0.0015, with side slopes of 1:1, and the overbank areas are covered with short grass. Find the minimum design elevation of the crest of the levees on both banks (with a freeboard of 3 ft.). The elevation of the flood plain area is 820 ft. Levee 250ft 25ft 4 Elevation 820 ft 250ft Figure 1 25ft 250ft Levee 2. If a bridge is to be built across this section (Figure 1) with embankments on both abutments. Find minimum width of the channel formed as a bridge opening that would meet the criteria in the definition of floodway (if a foot rise over is allowed).
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