In Northern Virginia trickles can quickly turn into streams when it rains and large areas of your property can erode in no time. Tree roots are exposed and mulch beds wash away with every rain. Low spots form in the yard and eventually, erosion patterns spread.
Drainage swales in strategic places stabilize the soil and eliminate washout of the mulched area. They create a channel for the water to flow through your property and depending on the materials used, such as river jack and boulders, it can be a beautiful landscape feature while managing surface water.