The damage caused by improper water runoff management can be extensive, leading to mold and mildew buildup, foundation damage, and even flooding. If the ground around the home is uneven, this can cause further issues and result in more water flowing toward the house than away from it. To fix the issue, a well-planned and installed system of drains, gutters, and downspouts are necessary to ensure that rainwater is diverted away from the building.