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.
11 Incredible Images Of America's Ageing Minuteman 3 Missile Silos. 08/07/2014 15:14 | Updated 08 July 2014. The Cold War has long-since passed, but many of the weapons and infrastructure that defined the near-50 year bi-polar conflict still remain.