Skip to main content

Systemwide Operation Planning as an Integral Aspect of Specific CSO Facility Designs

Buy Article:

$9.50 plus tax (Refund Policy)

Or sign up for a free trial

In 1994, the City of Portland signed an Amended Stipulation Final Order (ASFO) with the State of Oregon Department of Environmental Quality, agreeing to control combined sewer overflows (CSOs) on the Willamette River by 2011. To achieve the goal of controlling CSO volume by 97 percent, the City has embarked on a series of projects consisting of the expansion of wet-weather treatment capacity at the Columbia Boulevard wastewater treatment plant (CBWTP) and the construction of interceptors, tunnels, and pump stations. This paper focuses on the interconnected Westside and Eastside CSO tunnels. The Westside tunnel is currently being designed and the Eastside CSO tunnel is in the predesign phase. The subject of this paper is the series of analyses performed to ensure that the tunnel designs:

Incorporate real-time facilities to optimize operation of the tunnels themselves


Include planning for future real-time control (RTC) activity that is in harmony with other attributes of the overall CSO program to be completed by 2011


The analyses included comprehensive hydrologic and hydraulic modeling of the combined sewer drainage system and the tunnel system, RTC simulation of gates, weirs, and pumping facilities, and planning for instrumentation, monitoring, operation, control, and maintenance.

Hydraulic modeling software was used to evaluate and determine the feasibility of a number of operational scenarios and strategies for a variety of objectives. The analysis focused on operating the system in real time to ensure adequate velocities for flushing, maximizing use of the system for storing flows (controlling filling and evacuation), optimizing power consumption at pumping stations, minimizing sharp changes in flow rate arriving at the CBWTP, and controlling the amount of “first-flush ”separate stormwater accepted into the tunnel system.

An evaluation matrix was developed to summarize the RTC scenarios and their performance relative to criteria and objectives. Recommendations were then made to the tunnel design steering committee on measures and facilities to incorporate into the design.
No Reference information available - sign in for access.
No Citation information available - sign in for access.
No Supplementary Data.
No Article Media
No Metrics

Document Type: Research Article

Publication date: 2001-01-01

More about this publication?
  • Proceedings of the Water Environment Federation is an archive of papers published in the proceedings of the annual Water Environment Federation® Technical Exhibition and Conference (WEFTEC® ) and specialty conferences held since the year 2000. These proceedings are not peer reviewed.

    A subscription to the Proceedings of the Water Environment Federation includes access to most papers presented at the annual WEF Technical Exhibition and Conference (WEFTEC) and other conferences held since 2000. Subscription access begins 12 months after the event and is valid for 12 months from month of purchase. A subscription to the Proceedings of the Water Environment Federation is included in Water Environment Federation (WEF) membership.

    WEF Members: Sign in (right panel) with your IngentaConnect user name and password to receive complimentary access. Access begins 12 months after the conference or event
  • Subscribe to this Title
  • Membership Information
  • About WEF Proceedings
  • WEFTEC Conference Information
  • Learn about the many other WEF member benefits and join today
  • Ingenta Connect is not responsible for the content or availability of external websites
  • Access Key
  • Free content
  • Partial Free content
  • New content
  • Open access content
  • Partial Open access content
  • Subscribed content
  • Partial Subscribed content
  • Free trial content
Cookie Policy
X
Cookie Policy
Ingenta Connect website makes use of cookies so as to keep track of data that you have filled in. I am Happy with this Find out more