The most effective way to eliminate water in a celler is to seal the foundation from the outside. Sometimes though, the water comes in through the floor.
Trenching, or banking dirt against the house, will divert a lot of water and may reduce or eliminate the problem if you cant dig near the foundation. Water-blocking paints help too but are not always successful if applied on the "down-stream" side, regardless of what it says on the can. In some towns landscaping that alters the drainage needs a permit so be discreet if you want to experiment.
Good luck!
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