Alden (Alden Research Laboratory, Inc.) is an internationally acclaimed leader in solving flow-related engineering and environmental problems. For over 125 years, Alden has provided engineering, field, and laboratory technical assessments to address regulatory agency compliance and operational requirements. With laboratories in Massachusetts and Washington and offices across the country, Alden provides engineering services, environmental services, physical and computational flow modeling, flow meter calibration, and field services. Founded in 1894, Alden is the oldest continuously operating hydraulic modeling and testing laboratory in North America.
You can visit the Alden website here