No pumps made can keep up with 2 feet of rainfall.
No way the Feds would allow the canal to be built. They would argue it would hurt the wetlands and impact an alligator.
Not to mention the mighty Mississippi into which many other rivers flow.
They can’t stop the flooding in Memphis any better when the Mississippi goes into FLOOD STAGE, all the smaller inlet/outlets over flow too.
We have seen more heavy rain this year than is normal for the regions of MS, AR and TN that are a tri state area and all flow into the Mississippi River.