BIO SWALES Washington DC
When you have a three foot grade change between the backyard and the frontyard, you know there’s going to be runoff from heavy rainstorms, in the Mid Atlantic region. Why not make it work for you? The design of bio swales on the side lines of an urban property, allows the river to run right through it. Storm water management is achieved by deep excavation  to remove impermeable soil, to be replaced with gravel and composted soil. Evergreen shrubs and native plantings on top and no one is the wiser. Downspouts directed into swales add to the flow and rain gardens and permeable paths all allow rain water to soak in rather than run off.