A shallow ditch with gently sloping sides and various layers of soils beneath.
A bioswale - sometimes called a vegetated ditch - slows stormwater runoff and directs it to an area where it can soak in. It achieves the same goal as a rain garden, but is usually designed to manage a larger amount of runoff. A bioswale often uses grass and plants to stabilize the soil, reduce erosion, slow the flow, and absorb runoff.
What are the benefits?
Bioswales help filter out harmful pollutants like oil, fertilizer, pesticides, soap, and animal waste so they don't find their way into the storm system and our streams.
They reduce flooding by capturing the rainwater that would otherwise pool up on ground surfaces.