 This is typically done when the Wachusett Reservoir water level is increasing due to run-off from its own watershed.If the aqueduct route from the Ware River Diversion to the Wachusett Reservoir is open, diversion of water from the Ware River water into both the Wachusett and the Quabbin Reservoir routes will start the siphon.Once the siphon starts, water from the Ware River Diversion stops and the water flows from the Quabbin to the Wachusett Reservoirs continue naturally.