The downspout and drain tile are the most important pipes in a rainwater drain system. When these pipes become cracked or broken, water collects at the base of your home. This water then seeps into your basement walls, causing property damage and mold. This is when you want to make sure you have the right sump pump installed as well. A PVC downspout drain can easily become clogged with leaves or other trash. These clogs can happen quickly, especially during the fall.