Skip to main content

CSI: Collection System Investigations-Causes and Solutions for SSOs

Buy Article:

$17.50 plus tax (Refund Policy)

Or sign up for a free trial


Sanitary sewer overflows (SSOs) have emerged as the single most important indicator of wastewater collection system performance for both agencies and regulators. Managing, controlling, mitigating and eliminating SSOs (and the related parameter wastewater backups) will drive maintenance, rehabilitation, and investment in the collection system for years to come. There is often incomplete understanding into the nature of SSOs, their causes and cost-effective solutions.

SSOs happen for many reasons. Some agencies categorize causes of overflows into “dryweather” and “wet-weather” categories to identify the appropriate resolution. Dryweather overflows are amenable to maintenance directed solutions while wet-weather SSOs and backups often require capital investment into pipe rehabilitation, replacement, relief, and peak flow storage or treatment. Proper diagnosis of the problem is a key to implementing a solution that addresses the nature and frequency of the problem.

This paper will present results of investigations into why sewers overflow and backup, steps management can implement to mitigate SSOs, and examples of successful solutions to particular overflow problems. Reported causes and rates of overflow available in the public domain will be documented and effective measures utilities have adopted will be reported. This paper will present preliminary results from an ongoing research project, “SSO Solutions”, being performed by Black & Veatch Corporation for the American Society of Civil Engineers (ASCE) under a Cooperative Agreement with the US Environmental Protection Agency.

Document Type: Research Article


Publication date: 2003-01-01

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 These proceedings are not peer reviewed.

    WEF Members: Sign in (right panel) with your IngentaConnect user name and password to receive complimentary access.
  • Subscribe to this Title
  • Membership Information
  • About WEF Proceedings
  • WEFTEC Conference Information
  • 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
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