Volume units are given in cubes such as cubic feet or cubic meters. One cubic foot is equal to 7.481 gallons. A drop test refers to a method of measuring the flow of a filter bed in a water treatment facility by closing the influent valve and observing the volume loss in a specified time. Public water systems must be able to provide enough flow and pressure to fire fighting equipment without damage to existing systems or loss of water service. Flow measurements are calculated by units of volume per unit of time.
Flows determine feed rates and treatment time.
Hydraulics is the act of operating, moving, or employing water or other liquids in motion. The definition of hydraulics also includes the pressure created by forcing liquids through a narrow pipe or orifice. Inertia is the physical property of a body at rest to remain at rest or if in motion to remain in motion along a straight line when not acted upon by an external force. Infiltration is any unwanted contamination source entering into water or sewer service lines or holding areas. To successfully install a pump into an existing system, the pump should be sized according to the source and the need.