Fire hose coupling with American National Standard (NH) threads.

A hose lay in which double shutoff wye (Y) valves are inserted in the main line at intervals and lateral lines are run from the wyes to the fire edge, thus permitting continuous application of water during extension of the lay.

An appraisal of the interaction of hazard, exposure, and effects to a given set of values in a given area.

The average maximum vertical extension of flames at the leading edge of the fire front. Occasional flashes that rise above the general level of flames are not considered. This distance is less than the flame length if flames are tilted due to wind or slope. 

Situation Unit staff collect, process, and organize situation information, prepare situation summaries, produce maps, and develop projections and forecasts related to the incident. They gather and disseminate information for incident and agency decision processe.

The internal diameter of a tube, conductor, or coupling, as distinguished from its OD (Outside Diameter). Fire hose sizes are classified by a nominal internal diameter.

The ratio between the surface area of an object, such as a fuel particle, to its volume. The smaller the particle, the more quickly it can become wet, dry out, or become heated to combustion temperature during a fire.

A plan for responding to a variety of potential hazards.

Use of two or more fire pumps to move water a distance which would require excessive pressures in order to overcome friction loss if only one pump were employed at the source.

Green leaves and succulents, uncured vegetation which bends and curls inwards towards the heat source due to desiccation. One of the 11 NWCG categories of fire pattern indicator.