Definitions for "Master Stream"
Keywords:  pumper, ladder, aerial, nozzle, stang
When a large building is too heavily involved in fire to be saved or entry into the building for interior firefighting is deemed too dangerous, water is applied to the burning structure from aerial ladders. Additional water can be sprayed on the fire from other unattended appliances. The large rotatable nozzle assembly mounted on the top deck of a fire engine is called a Deluge gun. The deluge gun can be dismounted from the engine and placed on the ground to produce a monitor stream. A particular type of Deluge nozzle is called a "Stang".
The largest stream within a drainage basin into which all other streams flow. In Horton's Law of Stream Numbers, the master stream has a rank order of 1.
A master stream is a large and fixed stream of water. Master streams are used on the end of aerial ladders on ladder trucks and on top of pumper trucks. Master streams can deliver larger amounts of water than hand-held hose.