When the contractor poured the concrete of the driveway, it was not pitched for water runoff. Water runs back into the garage during a hard rain. I'd like to cut out a section and install a drain with a grate across the front of garage; out about 3 feet under the eaves--it's about 20' wide. I'm thinking cutting out a foot reforming the concrete by pouring a sloping bottom with 3" wall and 1" recess and 4" drain. While I'm at it, planning on a 1' X 1' catch basin with gravel bottom. We're on sand. Any help, experience or ideas would be appreciated.