Novelty
A natural siphon can only lift water about 30 feet (9.1 m), with the aqueduct located several hundred feet underground in places – however the water head is only about 25 feet (8 m) on the suction side of the aqueduct. Portions of the aqueduct follow the route of the Ware River Railway that was discontinued with the building of the Quabbin Reservoir. The siphon starts at the Ware River Diversion by feeding the river water into the aqueduct. If the aqueduct branch which travels to the Wachusett Reservoir (the Wachusett-Coldbrook branch) is closed, then Ware River water feeds into the Quabbin Reservoir for storage; however, if the Wachusett branch is open, then water flows in both directions. When the Wachusett branch begins to create sufficient suction as it fills, then the Ware River Diversion inlet is closed and water flows from the Quabbin to the Wachusett Reservoir as a natural siphon.
Read more about this topic: Quabbin Aqueduct
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—Henry David Thoreau (1817–1862)