Sam, I'm no expert, but my ears perked up when you said the dam was all clay & rocks. Rocks cause obvious problems, but too much clay can create issues just as too little clay. You want a mix of other soils with the clay, otherwise the dam will tend to crack as it goes through a wet/dry cycle.
Of course, you might have just meant you had adequate clay for the job, in which case this is not a concern. Keep an eye on things, my neighborhood lake washed out ten years ago and caused a lot of problems due to an improperly constructed dam!
Last edited by anthropic; 01/05/22 02:56 AM.
