Accurate flow measurement is critical for many clients. Used for billing, flow projection, and capacity evaluation, dedicated meter stations are used at treatment plants and in collection systems. Designed with careful consideration of the upstream and downstream hydraulic conditions, our engineers are experienced in optimizing the entrance and exit conditions of Parshall Flumes to achieve a distinct, repeatable transition from subcritical to supercritical flow. PECI recently designed multiple meter stations for the Trinity River Authority of Texas. One meter station was particularly challenging as it was experiencing hydraulic wave action that interfered with level measurement. PECI evaluated the installation and determined that the upstream interceptor could not provide the flow conditions needed for accurate measurement. PECI recommended a vortex-type flow baffle in an upstream manhole and flattening the slope of the interceptor to improve entrance conditions. The three-foot flume and associated work is under construction and is expected to be in service by the end of 2017.