The New River, a London waterway opened in 1613, supplies drinking water from the springs of which river?
London water supply infrastructure:  For much of London's history, private companies supplied fresh water to various parts of London from wells, the River Thames and in the three centuries after the construction in 1613 of the New River, the River Lea, which has springs that divert alongside Hertford at an elevation of 40 metres AOD. New River (England): The New River is an artificial waterway in England, opened in 1613 to supply London with fresh drinking water taken from the River Lea and from Chadwell Springs and Amwell Springs (which ceased to flow by the end of the nineteenth century), and other springs and wells along its course.
River Lea