Real-Time Control Implementation within a Combined Sewer System: An Operational Perspective

Whether you're planning to implement a multi-million dollar robust Real Time Control (RTC) system or a scaled-down simple version, there are several critical elements necessary for successful implementation and utilization by the Publicly Owned Treatment Works (POTW) staff. These critical components range from changing performance expectations to inclusion of the wastewater treatment plant operators and collection systems staff in all phases of program development and implementation. The Louisville and Jefferson County Metropolitan Sewer District (MSD) has initiated the second phase of their RTC program, with plans to ultimately implement a program targeted to cost approximately $83M. The in-line control portion of the program is targeted to cost approximately $30M, with the remaining cost for off-line storage facilities. The first phase contained five control points and is projected to provide a system-wide average annual overflow volume reduction of 10 to 20%. The second phase, currently being designed, includes the addition of four control points. Ultimate build-out of the entire RTC program is targeted to be approximately 20 control points. During the planning, design and implementation of the first phase, Louisville MSD staff successfully navigated past an intense learning curve. This paper will summarize their lessons learned, offering advice on program implementation which may assist other POTWs currently considering implementation of similar programs.