Project design flood: Difference between revisions
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==See also== |
==See also== |
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*[[Birds Point-New Madrid Floodway]] |
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*[[Morganza Spillway]] |
*[[Morganza Spillway]] |
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==References== |
==References== |
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Revision as of 03:35, 19 May 2011
The project design flood is a hypothetical "maximum possible" flood of the Mississippi River used by the United States Army Corps of Engineers to aid in the design and execution of flood protection in the Mississippi Valley.[1][2]
The current project design flood was developed in 1956.
1928 project design flood
In response to the Great Mississippi Flood of 1927, the Flood Control Act of 1928 authorized the Mississippi River and Tributaries Project (MR&T), which is implemented by the Mississippi River Commission (MRC). The MRC estimated a maximum probably flood discharge of 2.25 million cubic feet per second (cfs) at Cairo, Illinois that was greater than the 1927 flood but less than the 1927 flood combined with the maximum recorded discharge of the Ohio River in 1913. In a separate analysis, the U.S. Weather Bureau determined that a "maximum possible" flood would result in a discharge of 2.4 M cfs based on the maximum recorded flows of the upper Mississippi, Ohio, Cumberland, and Tennessee Rivers. In a combined analysis, the higher flow rate estimate was used.
Adding the flows of the Arkansas and White RIvers and subtracting the flow out the Birds Point-New Madrid Floodway (designed to remove 0.55 M cfs), the maximum flow farther down river at Arkansas City, Arkansas was estimated to be 2.85 M cfs with a flood stage of 74 feet. Adding the flows of the Yazoo and Red Rivers, the Weather Bureau estimated a flow of 3.0 M cfs just North of Baton Rouge at Red River Landing, Louisiana.
1941 project design flood
The Ohio River flood of 1937 caused the flood stage at Cairo to reach 59.5 feet despite a flow of only 2.1 M cfs.[1] In response, the United States Congress ordered the MR&T to review of the flood control plan. Maximum flows were changed to 2.6 M cfs at Cairo, 3.065 M cfs at Arkansas City with the White River backwater area levee overtopped, and Red River Landing unchanged at 3.0 M cfs.
Current project design flood
The current project design flood was developed at the request of the Senate Committee on Public Works in 1954.[3] The Mississippi River Commission and the Weather Bureau worked together to investigate hypothetical flood conditions. The study of a set of 35 combinations of actual storms resulted in the selection of combination called "Hypo-Flood 58A," a combination of previous storms in 1937, 1938, and 1950. The peak discharges were found to be 2.36 M cfs at Cairo, 2.89 m cfs at Arkansas City, and 3.03 M cfs at Red River Landing.
After the 1973 Mississippi RIver flood, the MRC reviewed the project design flood and found that it was still reliable based on current standards.
See also
References
- ^ a b c "The Mississippi River & Tributaries Project: Designing the Project Flood" (PDF), United States Army Corps of Engineers, April, retrieved 2011-05-16
{{citation}}:|format=requires|url=(help); Check date values in:|date=and|year=/|date=mismatch (help) - ^ "MR&T PROJECT" (PDF), MISSISSIPPI RIVER & TRIBUTARIES PROJECT, U. S. Army Corps of Engineers, February, retrieved 2011-05-18
{{citation}}:|format=requires|url=(help); Check date values in:|date=and|year=/|date=mismatch (help) - ^ Wohl. Inland flood hazards: human, riparian, and aquatic communities. p. 387. ISBN 0521624193.
{{cite book}}:|access-date=requires|url=(help)
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