Alden conducted a physical model study of a self cleaning wet well for the Hartford Water Pollution Control Facility Wet Weather Expansion project’s influent wet well pump station.   The purpose of the study was to evaluate the hydraulic conditions within the proposed screening facility and influent pumping station, including flow distribution to operating screen channels, flow patterns, free and subsurface vortex formation and swirl that may adversely affect the performance of the proposed IPS, and derive modifications, if needed, to provide satisfactory hydraulic performance, based on the Hydraulic Institute Standards, ANSI/HI 9.8-2012 (HIS) acceptance criteria.  The performance of the wet well under clean-out mode was also evaluated.