The water in Prospect Park originates at the top of Fallkill Falls in the center of the park, just north of Quaker Hill and east of Long Meadow. The Well House on the north side of the Lake originally provided the water for the watercourse, and was connected to an underground aquifer. The Well House became outdated when Prospect Park was connected to the New York City water supply system in the early 20th century. Today, Fallkill Falls is fed by a pipe from the city's water system.