Water resources management controls water resources systems, that are combinations of constructed water control facilities and natural, or environmental elements that work together to achieve water management. A constructed water resources system, consisting of structural facilities, provides control of water flow and quality and includes facilities for water supply and wastewater management; for drainage of land and control of floods; and for water control in rivers, reservoirs, and aquifers. Examples include conveyance systems (channels, canals, and pipes), diversion structures, dams and storage facilities, treatment plants, pumping stations and hydroelectric plants, wells, and all appurtenances. Natural water resource systems comprise sets of environmental or hydrologic elements in nature that include the atmosphere, watersheds, stream channels, wetlands, floodplains, aquifers and groundwater systems, lakes, estuaries, seas, and the ocean.
