https://en.wikipedia.org/wiki/New_York_City_Water_Tunnel_No....

https://www.nyc.gov/assets/dep/downloads/pdf/water/drinking-...

https://old.reddit.com/r/nyc/comments/in5lm7/cross_section_s...

Potentially related:

Discussing Waterworks, Stanley Greenberg's Photos of NY's Hidden Water System [video] - https://news.ycombinator.com/item?id=46416871 - December 2025

(Tunnel 3 will deliver 1B gallons/day and has a 200-300 year expected service life)