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The Morganza Spillway, a 4,159-foot (1,268 m) controlled spillway using a set of flood gates to control the volume of water entering the Morganza Floodway from the Mississippi River, consists of a concrete weir, two sluice gates, seventeen scour indicators, and 125 gated openings which can allow up to 600,000 cubic feet per second (17,000 cubic metres per second) of water to be diverted from ...
The proposed operation would have diverted 150,000 cfs from the Mississippi River into the Morganza Floodway. The planned operation was postponed (and eventually cancelled) when subsequent forecasts indicated that stages would be lower than originally predicted. [57] [58]
English: United States Army Corps of Engineers estimated Inundation Map Scenario 1a depicts the anticipated impacts from operation of the Morganza Floodway at 25% of its capacity with full operation of the Bonnet Carre’ Spillway.
The floodway can reduce stress by diverting additional water from the Mississippi into the Atchafalaya. [15] The Morganza Floodway was never used before the construction of Old River Control Structure, and as of 2016 has been opened only twice [16] for flood control since completion of the Old River Control Structure.
Levee breaches or "crevasses" occurred at Morganza and Grand Levee just downriver in 1850, 1865, 1867, and 1890. The Morganza Spillway, a major flood diversion project of the U.S. Army Corps of Engineers, is located immediately north of the town. Construction on this mammoth work began in 1939 and was completed in 1955.
The 1973 flood was the first time the Morganza Spillway was opened: from April 19 through June 13. At Memphis, Tennessee, the Mississippi was over flood stage for 63 days, more than that of the historic 1927 flood, and the river was above flood stage for an even longer 107 days at upstream Cairo, Illinois. [3]
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Scenario 2: Do not open the Morganza Spillway, and keep the Old River Control Structure at its routine operating level of only 30% of the Mississippi's flow; no additional water would be diverted Scenario 3: Do not open the Morganza Spillway, and open the Old River Control Structure somewhat more, which would divert an extra 150,000 cubic feet ...
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