Posted by Janicholson on May 08, 2020 at 07:52:43 from (24.240.46.228):
In Reply to: Conservation corps dam posted by rockyridgefarm on May 08, 2020 at 05:58:13:
If you take care to watch the soil horizons, you should be able to detect the original cut contours. Since it has been stable all these years, going to that depth can hurt nothing. If you desire more volume, (as noted below) going into sand, or gravel can drain the pond in short order, or fill it is the surface water is near the level of the spillway. But with the bottom in porous material, the level will be dependent on surface water level, and subject to drought. The two options are to go bigger, or deeper, or some of both. Bigger is OK, but increases water evaporation, and temperature. deeper should be done tapering away from the containment side of the dam at no greater angle than originally built in. 12 to 1 grade is reasonable for bank edges. if you intend to take out 100 of those dump trailer loads, it will not make much of a dent. If you need real volume you will need to put heavy equipment in the pit, and bottom dumps to haul it away. (I, and my family, own a 8 acre lake which was constructed to make I-94. It ran into gravel at 28 feet below projected water level, and started filling. The contractor cut about 6 feet deeper in that lowest spot, and filled it with the same yellow clay from the main cut then compacted it by scraper traffic to plug the porosity. Jim
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