Wastewater is any water stream that has been contaminated in some way by domestic, commercial, agricultural, or even natural influences. Wastewater evacuation refers to a variety of dirty water applications including drainage, sewage, and stormwater management. Regardless of the dirty water source, wastewater is diverted into municipal storm and sewage networks. Municipal wastewater networks transfer water to treatment plants designed to remove contaminants and impurities from the water. Wastewater evacuation systems can also be implemented with a reserve flood control system for emergency storm dewatering.