1. I actually did read the whole thing, just can't quite picture the entire fiasco just yet.
2. I smell bankruptcy's in the near future.
3. You need all the professional help you can muster including lawyers,
4. When you tire of screaming at people, scream even louder, No one is going to find the solution(s) but you, and you're going to have to become merciless.
5. Are you talking erosion from storm water? from the gutters and downspouts? If so immediately disconnect the downspouts, But I'm sure that's been discussed already.
Where is all this water coming from and why is it not being diverted properly?
Even with a sag in the building drain It takes greater pressures to back up, (overcome the static head pressure) and then how is the water from inside the drainage system backing up into the crawlspace? Broken pipe or open receptor somewhere?
Might be some dumb questions here but I just cant visualize the scenario your trying to describe.
Underground erosion, sinkholes and stuff, enough erosion that counter-tops are pulling away from walls?
You're in for a hell of a fight.
Best of Luck.
