Why Disconnect Downspouts?
In Montgomery County, a 1-year storm event (the type of storm that is expected to occur every year) typically dumps 2.6 inches of rain. If your roof is 1,000 square feet (average for the area), about 1,560 gallons of water will run off the roof, into your downspouts, and into the storm drain system over the course of the storm. Downspout disconnection keeps more of that rainfall on-site and reduces the amount of water that flows directly into the sewers. This helps reduce the amount of erosion caused by high volumes of water that flow from storm drain outfall pipes into local waterbodies.
