Geoff Lawton demonstrates what swales do.
A look at what they are doing on a farm in Pennsylvania to retain topsoil and prevent fertilizers, animal waste and pesticides from getting into streams and ending up in Chesapeake Bay.
Some features looked at: swales, creating a non-cultivated space near streams, using vegetation as a buffer…
Michael Gladnick and Deborah Seif talk about using vegetative swales to control and direct stormwater and to filter out particles. They are looking at a commercial or academic property not being used for food production, but the principles would be the same for productive land.