In what year was the River Lea constructed as part of the London water supply infrastructure?
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. River Lea:  A diversion known as the New River, opened in 1613, abstracts clean water away from the lower stretch of the river for drinking.
1613