This is the process of redirecting rooftop runoff onto pervious infiltration surfaces, most commonly a lawn or garden.
Disconnected Rooftop Runoff Areas. Rooftop disconnection involves directing flow from rooftop downspouts onto vegetated areas where it can soak into or filter over the ground. This disconnects the rooftop from the sewer/storm drain system and reduces both runoff and pollutants delivered to receiving waters.
Disconnected Non-Rooftop Areas. Non-rooftop disconnection involves directing flow from impervious surfaces, such as driveways, streets and sidewalks onto vegetated areas where it can soak into or filter over the ground.
Rainwater harvesting is the practice of collecting and storing rainwater in large, durable containers, usually from rooftop gutters. Rainwater harvesting systems typically use a storage container such as a cistern, rain tank, or rain barrel for capturing rainfall for future use.
Rainwater harvesting captures the first flush of stormwater, which contains the highest concentrations of pollutants.