They have to have discharge copabilities the area is a water shed for farm fields and a feeder to a small river.My mothers town of 98 people becomes an Island nearly every spring from rains and the river flooding.The main lake will also act as a flood control project. If they can get it built before a spring it would fill in 1 flood. The area that floods now is about 3 miles wide and up to 12-15 miles long and I have seen it 4 ft deep for days.Tnriverrat knows the area.It is out side Fairfield IL all the way to the interstate 64 and almost to carmi Illinois. When the Little Wabash river floods they don't measure it in acres they measure it in Miles and it floods often.They oil wells it that area are all setting on platforms 6 ft up just from the regularity of water.We often get water in the Wabash river between Indiana and Illinois that is 28-29 ft and has a flood stage at 24 ft.The little wabash floods at 16 ft and has often(sometimes 2x yearly) hit 28 ft.The areas that flood are mostly farm ground bottom land.
Dennis