Hubbell, Roth & Clark, Inc. provided the planning and design, and construction engineering for the City of Saginaw's Combined Sewer Overflow Control Program.  The City of Saginaw was awarded EPA's National Excellence Award for their CSO Control Program.

The $110 million program consists of six (6) new retention treatment facilities (RTF), collector sewers, pump stations, additional in-system storage and renovations to an existing RTF and pump station.  In general, the three phases (A, B, & C) consist of the following:

Phase A provides control of 1/2 inch-one hour storm rainfall by constructing RTFs and collector sewers or modifications to existing regulator structures to prevent overflows up to the 1/2 inch-one hour event.

Phase B provides elimination of all uncollected/untreated overflows to the Saginaw River by extending collector sewers to collect the outfalls or bulkheading existing outfalls.

Phase C consists of meeting the MDEQ's current definition of adequate treatment.

Many of HRC's unique design features for CSO retention treatment basins have become state-of-the-art for CSO control.  These features include:

• Gravity flow through basins with multiple effluent weirs for low head losses,
• Some of the first uses of tipping troughs for flushing the RTFs,
• High energy sodium hypochlorite disinfection systems,
• Low velocity RTF flow measurement for automatic chemical disinfection pacing.