Subsurface water is a threat to your basement and crawlspace if you haven’t planned for it. If your landscaping is sloped towards your home, this subsurface water will always run into your home. Also, homes that don’t have rain gutters allow buildup of water at the base of the structure. Another issue is downspouts that empty too close to the structure and cause flooding. If you check your basics (gutters, downspouts, and landscaping) you have already done as much as you can to prevent subsurface water from entering your home.