I have a 1954 ranch with an attached garage. Water from melting snow (and rain the rest of the year) accumulates in the center of the garage floor. By late winter, I have a small lake in the garage. Short of putting in a dock, is there anything I can do?
First, attempt to eliminate any water that may be caused by poor surface drainage. The soil outside the garage should be at least 6 inches below the foundation of the garage. The soil should direct surface water away from the slab and footing. Make sure the gutters and downspouts are directing water away.
If the real problem is snow and ice from the car, the best bet is to sweep and shovel it whenever it accumulates, and before it melts. Technically, the garage floor slab should have a pretty good pitch or slope to the garage door, and water should just flow out the door.
If you have a low spot that collects water, consider drilling a 1/2-inch hole through the slab at the low spot. You will need a hammer drill and a special masonry bit. Plan on a little bit of work, noise and dust. The hole will drain away most water into the gravel under the floor slab. Since the hole is small, you will need to clear it periodically.