Profile: Free Flow, Inc. is a manufacturer of primary elements for open channel flow measurement. We produce accurate flow elements to measure flows from 2 gallons per minute to 335 million gallons per day. We specialize in the design and assembly of parshall flumes, palmer bowlus flumes, trapezoidal flumes, cutthroat flumes, H flumes and metering manhole stations. We expertise to solve difficult flow measurement applications.