A wetland overlay district is a defined area a specified distance within the ordinary high-water mark of navigable streams, rivers, lakes, ponds, flowage, or the floodplain’s landward edge. Wetland overlay districts can require that some existing vegetation is maintained as a buffer to protect water quality and the amount of tree and shrub clearing is limited. The amount of vegetation removed within a certain distance of navigable streams can also be limited. Public review and hearings can be required for earthmoving activities and conditional uses within the protection zone.