If you don't have a sump you could cut a 12 x 12 hole, dig out some of the dirt so it's at least 3-4 feet deep and then line it so the water won't get soaked into the dirt. When it fill's with water use a submersible pump to pump it out.
This is what I did cause my floor sloped forward toward the house. Cut the floor dug it out then put a 5gal bucket and cemented around it to build it back up then got grating from a scrap steel place and dropped it in so it fits flush to the floor have to bail it out with an ice cream pail every spring if it fill up and freezes I add a bit of water on top of the ice and put an aquarium heater in the water next morning it's thawed