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.
There are three types of silos: (1) the. conventional upright or tower silo; (2) the. oxygen-limiting tower silo; and (3) the horizontal. silo. Horizontal silos can be either a pit, an above. ground concrete bunker, or plastic bag. Silos differ in. costs, convenience and storage losses.