A classic rain garden renovation typically involves creating a natural, landscaped area that captures rainwater from roofs and paved surfaces, allowing it to infiltrate into the ground rather than run off into storm drains. This helps reduce stormwater runoff, filter pollutants, and replenish groundwater. The process may include planning the garden's layout, selecting appropriate plants, constructing a berm to slow water flow, and ensuring proper drainage. The design aims to mimic a natural wetland, often incorporating native plants that are adapted to the local climate and soil conditions.