Depending on the source of water and your home, an interior or exterior drainage system may be better. An interior system gathers excess water and sends it to a sump pump, permanently resolving the leak. This is for when water is gathering around the basement floor where it meets the wall. Crawlspace Renovations will determine if an interior or exterior drainage system will be the best solution for your home. An exterior system will redirect water away from the home and protect the foundation from other elements.