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Fire hydrant in Charlottesville, Virginia, United States. A fire hydrant, fireplug, [1] firecock (archaic), [2] hydrant riser or Johnny Pump [3] [better source needed] is a connection point by which firefighters can tap into a water supply. It is a component of active fire protection.
Forestry hose is a fabric-covered, flexible hose used to fight fires in grass, brush, and trees where a lightweight hose is needed to maneuver it over steep or rough terrain. Forestry hose comes in 1.0 and 1.5 in (25 and 38 mm) nominal inside diameters and is designed to operate at pressures up to about 450 psi (3,100 kPa).
It is used in the design of water pipe systems [1] such as fire sprinkler systems, [2] water supply networks, and irrigation systems. It is named after Allen Hazen and Gardner Stewart Williams. The Hazen–Williams equation has the advantage that the coefficient C is not a function of the Reynolds number , but it has the disadvantage that it is ...
In 2000, in the city, 26.7% of the population was under the age of 18, 11.2% was from 18 to 24, 23.6% from 25 to 44, 20.5% from 45 to 64, and 18.1% was 65 years of age or older. The median age was 35 years. For every 100 females, there were 101.7 males. For every 100 females age 18 and over, there were 98.5 males.