DOEE’s RiverSmart programs help to reduce stormwater runoff that harms the District’s waterways and the Chesapeake Bay. RiverSmart programs provide financial incentives to help District property owners install green infrastructure such as rain barrels, green roofs, rain gardens, permeable pavers, shade trees, and more. These practices allow rainwater to stay on site and soak into the ground, where natural processes help remove pollutants. (from website)