Mexico's New Mega-Tunnel Diverts Floods, Protecting 1.2 Million Residents
A major new drainage tunnel is now operational in Nezahualcóyotl, Mexico. The Xochiaca-Churubusco interceptor tunnel aims to tackle severe flooding that has affected the eastern region of the State of Mexico and Iztapalapa for years. Authorities say the project will protect over 1.2 million residents from heavy rainfall damage. The tunnel connects to three key pumping stations—Carmelo Pérez, Kennedy, and Sor Juana—and directs excess water into an oxidation lagoon with a capacity of 1.06 billion gallons. At full capacity, the system can divert 16,000 litres of water per second, equivalent to emptying 36 tanker trucks every minute.
Construction took just five months and cost $27 million USD (475 million pesos). The project is now the highest-capacity hydraulic infrastructure in the eastern Valley of Mexico. Two of its seven access shafts are already active and ready for use during storms. Previous governments had delayed funding for essential drainage upgrades in this area. The new system is designed to reduce flood risks not only in Nezahualcóyotl but also in Los Reyes La Paz and Iztapalapa, where waterlogging has been a persistent problem.
The tunnel’s activation marks a significant step in managing chronic flooding across the region. With its high diversion capacity and strategic connections, the system is expected to limit water damage during the rainy season. Local authorities have confirmed that all components are now fully prepared for operation.
