Years ago, when I first started working a builder I was working with bought the wettest lot I had seen. We dug a foundation only to watch it fill up to the top with water. We left it until spring at which time I was charged to pump it out. Another builder came out and looked at it and came up with a brillant plan. We were sitting on a layer of fairly hard soil and impentibrible soil, upon which was 4 feet of saturated, poor soil. He put in a wider footing, built up the walls and pads to almost 7 feet. The then brought in load after load of pit run and packed the inside of the foundation to above the outside trade. He then packed almost 1 foot on the outside and graded it slightly away. This put the ground level of the inside of the foundation 1 foot above the normal grade of the lot and had adequate flow away from the lot. It worked perfect. Ended up with one of the driest crawlspaces around on a lot that was pretty much flooded. I was surprised he got away with building on the lot and am sure we never could today, but man, it saved the guy I was working with from losing $40 to $50 thousand. Never, ever, heard of one problem with the set up.