I own a house in Ct with an exterior basement stairwell that runs parallel to the south side of the house. There is a drain at the bottom of the stairwell but in heavy rains it backs up and water enters the basement through the door. It is also a problem when snow accumulates in the stairwell. I am looking for some sort of hatchway system for this type of stairwell but all I can seem to find is the more conventional type for stairs that are perpendicular to the side of the building. Any suggestions?