Skip to main content

Advanced Method of Projecting Manhole I/I Quantification for Specific Storm Events Improves Rehabilitation Prioritization Scoring Process

The full text article is not available for purchase.

The publisher only permits individual articles to be downloaded by subscribers.

or click here to sign up for a free trial


Manholes represent a rather complex structure for assessing its structural condition and “leakiness” potential. Factors such as the assembly of components with multiple construction materials and exposure mechanisms to rainfall and runoff make computational scoring and I/I quantification logic complicated. Manholes have the potential to be significant sources of extraneous infiltration/inflow (I/I) but it is difficult converting visual inspections into I/I quantification. The American Society of Civil Engineers (ASCE) 2009 publication titled Manhole Inspection and Rehabilitation and other publications were used to develop an analysis tool for assigning infiltration/inflow (I/I) to standard manhole defects and projecting the I/I rates to vary with specific storm event rainfall frequency, intensity, and duration. The tool also adjusts the I/I rates depending the defect's component location and on which one of four rainfall runoff exposure mechanisms the manhole is exposed; sheet-flow, ponding/tributary limited, ponding/tributary un-limited, and elevated. The tool's I/I quantification process and development basis improves the engineering integrity of rehabilitation cost effective analysis and prioritization decisions.

Keywords: Condition Assessment; Defects; I/I; I/I Quantification; Infiltration; Inflow; Manhole; Prioritization; SCREAMâ„¢; ehabilitation

Document Type: Research Article


Publication date: January 1, 2010

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 These proceedings are not peer reviewed.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
Free content
New Content
New content
Open Access Content
Open access content
Partial Open Access Content
Partial Open access content
Subscribed Content
Subscribed content
Free Trial 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