A branch drain accepting waste products delivered to it vertically, by gravity, from one or more similar but usually smaller fixtures, and conducting them horizontally to the primary disposal drain.
When the Minuteman III retires, the silos and launch facilities at Malmstrom Air Force Base in Montana, which oversees 150 nuclear ICBMs scattered across a 13,800 square miles, will have been buried for 70 years.
The Cold War may have ended a generation ago, but a fascinating new map put together by Mother Jones magazine, shows exactly where highly radioactive nuclear material is situated on mainland America. Atomicland: The new map showing the location of nuclear facilities on the mainland U.S.