Before revision: Controlling watersources Bankstown Reservoir in Sydney Recreational-only Kupferbach reservoir near Aachen, Germany Reservoirs can be used in a number of ways to control how water flows through downstream waterways: Downstream water supply – water may be released from an upland reservoir so that it can be abstracted for drinking water lower down the system, sometimes hundreds of miles further downstream.
After revision: Controlling watersources Bankstown Reservoir in Sydney Recreational-only Kupferbach reservoir near Aachen, Germany Reservoirs can be used in a number of ways to control how water flows through downstream waterways: Downstream water supply water may be released from an upland reservoir so that it can be abstracted for drinking water lower down the system, sometimes hundreds of miles further downstream.