My garage floor has settled about 6" and has cracked in the middle. Too expensive to tear out..what to do? Sink a 55-gal. drum with rocks and make a drain? Also I have a 8' x l0' cement slab that was not poured level and the water runs in the garage. What is the proper procedure in pouring a cement slab? Is it best to use steel rods or go with the new cement that has fiberglass in it? Any help will be appreciated.