The Washington Aqueduct is a water supply system that delivers drinking water to the District of Columbia and parts of northern Virginia. Constructed in the mid-19th century, it draws water from the Potomac River and transports it through a series of pipes and reservoirs. The aqueduct is managed by the U.S. Army Corps of Engineers and plays a crucial role in providing clean water to residents. It includes several key components, such as the Dalecarlia Reservoir and the Great Falls intake, ensuring a reliable water supply for the region.