Probably the most important reason why correct drainage is so important for your foundation is that it prevents water damage. Concrete is porous, so water can get into the material, especially if there’s any cracks or similar damage. This is a problem because as the water freezes and thaws as the weather changes it can cause the concrete to expand. This is in turn and result in cracks and other major, and more serious, damage occurring. Working drains can prevent water damage from occurring, and the real headaches that often come with it.