We had a listener who had a severe problem with drainage. An area in his yard was like a swamp. Moss would grow everywhere and the excess water would stand for days. We recommended using a product called Penmax to eliminate the standing water fast. The listener told us he used the Penmax, went inside and drank 2 beers. When he went back outside the water was Gone. Yes, it really works that fast! You can almost watch the water drain away. Penmax will open up the pores of the soil up to 8 feet deep.