A little flood education
Posted: Fri Apr 29, 2011 9:19 pm
Had to wrap my mind around this yesterday talking to Dan P.
The levee system on the MS River that starts at Memphis goes all the way down to where the Yazoo enters the MS just north of Vicksburg. Then the Yazoo levee picks up and wraps all the way back up through Delta National, up the west side of the Whittington Canal (west levee of Panther Swamp), hits the main Yazoo levee just south of Silver City and goes up past Belzoni, all the way up toward Greenwood (and maybe a little farther, I'm not sure).
So you have all of the Delta west of the Yazoo and east of the MS surrouned by a levee. The Sunflower River flows from north of Clarksdale and the Quiver flows from near Webb. The Quiver runs into the Sunflower between Indianola and Moorhead. The Sunflower continues south all the way down to DNF, between Rolling Fork and Holly Bluff. The Sunflower runs into the Yazoo on the south end of the Forest and there is a gate there (Little Sunflower Control Structure). If the gate is shut, the Sunflower turns SW and follows a man-made channel right beside the Yazoo levee, under 61 just north of Redwood, and then it joins Steele Bayou. There is another gate here (Steele Bayou Structure) that can also be closed off. Deer Creek and every tributary in the Delta that doesn't run into the Coldwater, Tallahatchie or Yazoo north of Belzoni eventually drains down to one of these 2 structures. When they shut them, it's like putting the plug in the bathtub. There is no way for the water to get out of the Delta until the Yazoo/MS drops below the level of the water on the Delta side of the structures.
Now, jump across to the east side of the Yazoo. There is a levee from a little north of Greenwood where the Yalobusha comes into the Tallahatche, which is where the Yazoo starts. This levee protects everything between the Yazoo and the hills. There is a gap somewhere south of Yazoo City, but for the most part, the narrowing strip between the hills and the Yazoo all the way down to Redwood is protected by a levee. When the Yazoo gets up, all the creeks coming out of the hills get backed up if the control structures that go under the levee are shut.
The levee system on the MS River that starts at Memphis goes all the way down to where the Yazoo enters the MS just north of Vicksburg. Then the Yazoo levee picks up and wraps all the way back up through Delta National, up the west side of the Whittington Canal (west levee of Panther Swamp), hits the main Yazoo levee just south of Silver City and goes up past Belzoni, all the way up toward Greenwood (and maybe a little farther, I'm not sure).
So you have all of the Delta west of the Yazoo and east of the MS surrouned by a levee. The Sunflower River flows from north of Clarksdale and the Quiver flows from near Webb. The Quiver runs into the Sunflower between Indianola and Moorhead. The Sunflower continues south all the way down to DNF, between Rolling Fork and Holly Bluff. The Sunflower runs into the Yazoo on the south end of the Forest and there is a gate there (Little Sunflower Control Structure). If the gate is shut, the Sunflower turns SW and follows a man-made channel right beside the Yazoo levee, under 61 just north of Redwood, and then it joins Steele Bayou. There is another gate here (Steele Bayou Structure) that can also be closed off. Deer Creek and every tributary in the Delta that doesn't run into the Coldwater, Tallahatchie or Yazoo north of Belzoni eventually drains down to one of these 2 structures. When they shut them, it's like putting the plug in the bathtub. There is no way for the water to get out of the Delta until the Yazoo/MS drops below the level of the water on the Delta side of the structures.
Now, jump across to the east side of the Yazoo. There is a levee from a little north of Greenwood where the Yalobusha comes into the Tallahatche, which is where the Yazoo starts. This levee protects everything between the Yazoo and the hills. There is a gap somewhere south of Yazoo City, but for the most part, the narrowing strip between the hills and the Yazoo all the way down to Redwood is protected by a levee. When the Yazoo gets up, all the creeks coming out of the hills get backed up if the control structures that go under the levee are shut.