Having ready access to an ample supply of water is critical in an emergency. Large cities provide pressurized hydrants for use in fighting fires. In rural areas, however, small water systems may not have enough water in reserve to fight a fire. Private wells can seldom provide the necessary flow for firefighting. Ponds, streams, and even wastewater treatment lagoons can be considered as a source of water to combat a fire.
Dry hydrants provide an easy access to fill tank trucks regardless of weather.
The top of the pipe extends above the ground next to a body of water and the bottom of the pipe extends down into the water. A minimum of two feet of water must be maintained over the bottom of the pipe to assure year-round water supply. The vertical dimension is the most limiting. Water cannot be lifted by suction greater than 20 feet. The hose connection must be positioned 2 feet from the ground so it is accessible year-round, even in snow.