Rainwater flows off of your roof into your gutters and then into downspouts. From the downspout storm water flows into the sewer system and then into the Anacostia and Potomac Rivers.

To help protect our rivers from pollution, it is a good idea to disconnect your downspout from the storm sewer system. However, it is important that this concentrated flow of water be safely managed.

Storm water from your roof and gutters may be stored in rain barrels for later use, but a rain barrel system may not be appropriate for all situations. It may be more appropriate to direct storm water elsewhere on the property. However, thought must be given to where the water will go once it leaves the downspout. Not only is this water a valuable resource and should be viewed as such, most municipalities have very specific guidelines about where rooftop runoff may be discharged.

At minimum, the downspout should discharge rain water on to a stone, flagstone or plastic splash block to slow it down and decrease erosion and ponding near the foundation of your house. However it is best to direct your storm water runoff to a planted or grassy area, or to a rain garden where the rain will water these plants as well as allow for increased infiltration, groundwater recharge and pollutant removal.

You can direct the water coming out of your downspout by using a rigid or perforated pipe, logs, an earth berm or some combination of these. To prevent damage to the foundation, it is important to ensure that the water flows at least 4 feet away from the house. Make sure the redirected storm water does not pond, unless it is directed to a rain garden, and then only for a short time. If ponding or erosion is occurring, digging or tilling some compost into the soil to improve drainage and planting some ground cover or water loving plants may alleviate the problem. If not, it may be necessary to regrade the surrounding area or redirect the storm water to a more appropriate area.