Leaky water

Plumber’s Job on a Giant’s Scale: Fixing New York’s Drinking Straw

Excerpt:

All tunnels leak, but this one is a sieve. For most of the last two decades, the Rondout-West Branch tunnel — 45 miles long, 13.5 feet wide, up to 1,200 feet below ground and responsible for ferrying half of New York City’s water supply from reservoirs in the Catskill Mountains — has been leaking some 20 million gallons a day. Except recently, when on some days it has lost up to 36 million gallons.

Comment: Worthwhile read if you are interesting in civil engineering projects