An industry standard for determination of pipeline carrying capacity is the Hazen-Williams friction coefficient “C”. This “C” value is a unit less, dimensionless number that reflects the flow characteristics of the existing pipeline compared to that of a new pipe. The quantity flowing in a pipe with a given head loss varies directly as the value of “C”. Testing is conducted by measuring the pressure differential and water flow over the distance of the pipe under study. This is done with our Polcon ® pressure recorders and differential pressure recorders, the Sentry and the Pacer.