Among the best of these methods is to install a sub-floor drainage system along the perimeter of the floor. Here are a few challenges to this method. One is to keep the drain from being clogged by mud over the years. Many homeowners go years without a water problem and then develop one because of existing sub-floor and sub-surface drains clogging with mud. Another is to set up the system to accept water from the walls without leaving a large unsightly gap at the edge of the floor which can collect dirt and debris from the floor, also clogging the drain.