How do you divert water FROM under a house?
Never divert water under a structure unless the plan is approved
by a licensed engineer! Water should be diverted away from, and
around, the house. This requires that the earth around your house
be sloped away from it. If this is not feasible, drainage ditches
should be constructed or install drainage pipe with yard inlets.
Depending on your exact situation, maybe you need a french drain or