Miller City levee break and incipient meander cutoff

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On July 15, 1993, the flooding Mississippi River broke through a levee near Miller City, Ill., at the head of the Mississippi Embayment, approximately 55 km upstream from Cairo, Ill. Flow through the break crossed a high-amplitude meander bend and reentered the main channel approximately 24 km upstream from Cairo, bypassing 31 km of the river channel. The incipient meander cutoff is one of the more dramatic examples of geomorphic change accompanying the 1993 flood. Discharge and bathymetry data were collected in the incipient cutoff channel every other day during the 2 weeks before and after the flood peak. During the peak on August 7, as much as 8,100 m3/s, or approximately 25 percent of the Mississippi flood discharge, was bypassing the meander bend. The flow excavated an irregular channel in the flood plain up to 25 m deep. This irregular channel extends as far as 2 km downstream from the levee break. By August 25, as much as 2,900 m3/s was still flowing through the levee break; with recession of the flood, extensive sand deposits were exposed on the margins and downstream from the scoured areas. Preliminary data indicate that local relief, such as relict channels and preexisting county roads, affected the extent of new channel formation.

Additional publication details

Publication type Conference Paper
Publication Subtype Conference Paper
Title Miller City levee break and incipient meander cutoff
ISBN 0784400377
Issue pt 1
Year Published 1994
Language English
Publisher Publ by ASCE
Publisher location New York, NY, United States
Larger Work Title Proceedings - National Conference on Hydraulic Engineering
First page 623
Last page 627
Conference Title Proceedings of the 1994 ASCE National Conference on Hydraulic Engineering
Conference Location Buffalo, NY, USA
Conference Date 1 August 1994 through 5 August 1994
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