Exterior drainage plan feedback
As part of my remodel of my lower level (~4′ below grade, zone 5a Colorado), I found evidence of some moisture and bulk water issues, though I wouldn’t say I classically have a ‘wet basement’.
Per the attached drawings, I’m planning on adding drainage as shown, and would welcome any feedback on the plan. I think it is mostly a surface water issue, versus groundwater.
A few open questions:
1. I had intended to tie the radon system into the sump, and thus the perimeter footer drain. Since I’m using the dimple mat, I’m not sure if I will lose suction out the top when it is capped and a few inches beneath the surface, or if there are any ideas how to prevent this.
2. I’m not sure the trench/french drain approach will work for me near the surface, given my soil is 60%+ sand, and drains easily. I added a liner, though am not sure if that will work, and ultimately I’d tie it into the rest of the gutter system.
3. Anyone see any significant issues with the length of the perimeter drain being up to 110′ from the sump, and being almost flat?
Any ideas of other forums where drainage is routinely discussed would be welcomed.