The answer to 'how to care for drainage system' is to regularly inspect, clean, and maintain your home's drainage system. This includes clearing debris from gutters, downspouts, and storm drains, as well as ensuring proper drainage around your home's foundation.
Start by visually inspecting your drainage system at least twice a year, in the spring and fall. Look for any blockages, cracks, or other issues that could prevent proper water flow. Use a garden hose or high-pressure washer to flush out gutters and downspouts, removing leaves, twigs, and other debris. Check that downspouts are directing water at least 6 feet away from your home's foundation. If you have storm drains, use a drain snake or other tool to remove any built-up debris.