By: Kelley Williams, Chair Bigger Pie Forum   Backwater flooding happens when the Mississippi River is higher (about 43’ at Vicksburg) than the Yazoo River and blocks its discharge.  It takes less rain to raise and keep the Mississippi above 43’ than it used to. ( See More Flood for Less Rain .) So backwater flooding and batture flooding inside the levees are more frequent and longer — over three times longer since 2015.  Why? What happened to cause a step change in flooding in 2015? The...