You must consider the new options available for heelguard drains. The best of designs cannot make a good heelguard if good quality products are not used while making the heelguard drains. Gravel and other porous materials were the first choice of people when they were thinking of making or remodeling the heelguard exhaust because they lasted for a longer period. The problem is that heelguards have a short span between street and the garage. We cannot push excess water on the streets so we have to hurl the asphalt on the middle of the heelguard and install a heelguard drain at a low point.