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.
silo (plural silos) ( 1 agriculture) A vertical building, usually cylindrical, used for the storage of grain. ( 2 military) An underground bunker used to hold missiles which may be launched. ( 3 pejorative, management) An organizational unit that has poor interaction with other units, negatively affecting overall performance.