Abating Indianapolis’ Combined Sewer Overflow System – An Overview of the DigIndy Tunnel System
Michael Miller, PE, Citizens Energy Group
Citizens Energy Group is implementing a Long Term Control Plan (LTCP) to comply with a federal consent decree requiring combined sewer overflow (CSO) abatement. The DigIndy Tunnel System is the backbone of Citizens’ $2B LTCP, and includes seven primary components. They are; the Deep Rock Tunnel Connector Pump Station, the Deep Rock Tunnel Connector, the Eagle Creek Deep Tunnel, the White River Tunnel, the Lower Pogues Run Tunnel, the Fall Creek Tunnel and the Pleasant Run Tunnel. Each tunnel is constructed in the bedrock nearly 250 feet below ground. After more than eight years of construction, three of the seven key projects are complete. The remainder of the system is in various phases of design and construction. Once the system is fully constructed, it will prevent over five billion gallons of combined sewage from entering Indianapolis’ waterways annually. The intent of this presentation is to provide an in depth look into the DigIndy Tunnel System and share the benefits to our environment that the program will provide.