johnny skeptical - 7/12/2018 14:39 we had a drainage ditch here that something like a 36” main drained into at the head of the ditch, there is a small natural creek that dumps in about the same spot. The main and the creek come from more or less opposite directions. For years the bottom of the main would be about level with the ditch water level in normal flows, but if the little creek watershed got a pile of rain, and the main watershed didn’t get as much, it would push water back up the main and fill up the slough holes for a mile or so back up the main. So the interesting thing was that when the ditch was dug it was engineered like most ditches in our area. it was discovered a few years ago that the ditch was not being maintained at the depth it was originally engineered for, most likely because the slope gradient for the banks would have been too great for the depth it was supposed to be at, and I suppose beings it was the head end it was called good enough, back in the day. Sooo, they were also having a problem with bank erosion, because of the amount of fall for the first mile or so, so it was decided to increase the ditch depth, and widen the ditch also to get the correct slope. When it was all said and done the water level in normal flows sits about 2’ below the main now. Cured a lot of problems.