It will soak in alot of water. The wet spot your talking about is on the back side of the damn?

"Anyway, The toe of the dam has a wet spot about 20 foot across that stays wet, and continues to flow ( Maybe a couple gal/min) after the rest of the are has stopped draining. A few days after a rain, it will essentially stop flowing, but stay wet. Is this likely to settle and seal?"

Kinda confused on this part.. If its leaking all the way through the damn at the bottom. I would consider starting over..

I believe in catch and release. I catch then release to the grease..

BG. CSBG. LMB. HSB. RES.

[Linked Image from i90.photobucket.com]