The Natural Treatment System is a cost effective, environmentally sound alternative for handling dry weather runoff. In very simple terms it will work much like the San Joaquin Marsh with smaller manmade wetlands placed strategically in many areas throughout the watershed. Low-flow natural and urban runoff, as well as smaller storm flows will be diverted into man-made wetlands throughout the San Diego Creek Watershed where contaminants will be removed and prevented from reaching the Upper Newport Bay. At the same time the system will provide a natural resource, riparian habitat, wildlife and water quality benefits throughout the watershed.