The Delaware Aqueduct is a major water supply system that delivers drinking water to over nine million people in the New York City metropolitan area. It is the longest continuous water supply tunnel in the world, stretching approximately 137 miles. The aqueduct primarily transports water from the Delaware River and its tributaries, ensuring a reliable source of clean water. Constructed in the 1940s and 1950s, the aqueduct is a crucial part of the New York City Water Supply System. It consists of a combination of tunnels and reservoirs, helping to maintain water quality and manage supply during dry periods. Regular maintenance is essential to prevent leaks and ensure the system operates efficiently.