How can I stop water from coming into my house? (If it's possible )

Last October I lost pretty much everything I owned to a flood. I blocked the door, and my window with clay from our yard. The seal was water tight. But as the rain fell the water got to knee deep around my house, and then the water seemed to just come in everywhere.

I’m on a cement slab, at ground level.

Hurricane Mathew is potentially going to hit my city (Charleston SC. )

Does anyone have any ideas about how to keep the water out?

I’ve been told that the water can come up through the concrete slab, so even if I put sandbags all around my house, it would still flood.

Any help would be greatly appreciated.