A typical catch basin is constructed of a cone, reducer top, riser rings and a steel frame and grate. Over time asphalt will shrink from around the catch basin frames and water often times will seep into that void before it has a chance to drain into the catch basin. In winter, as the runoff is mixed with highly corrosive parking lot salt, there is an even greater chance of the foundation to deteriorate. The freeze/thaw cycles we have in New York further accelerate the deterioration process. If catch basins are left unrepaired the asphalt in the surrounding area will further deteriorated and cave in because of base erosion and asphalt failure.