Skip to main content

Selecting a Rainfall that Results in a Peak RDII Condition for Design - Using a Standardized Procedure

Buy Article:

$9.50 plus tax (Refund Policy)

Or sign up for a free trial

Engineers and sewer system operators need tools for predicting peak flow rate conditions in sewers. This paper describes a general approach for projecting peak RDI/I (rainfall dependent I/I) flow rates from flow and rainfall monitoring data to compare the peak flow rates resulting from different types of storms. This approach represents an improvement over previous practices because it includes simple statistical tests for quality control and determining the level of confidence. Therefore, users of peak flow rate information will know the level of confidence for the rate projections and can make better decisions about the level of risk for SSOs (Sanitary Sewer Overflows) and estimating sewer design capacity. This approach was applied to data collected at 14 long-term flow monitors from Atlanta, Brentwood, and Nashville. The results from these southeastern cities indicated that in most cases the 24-hour storm was more useful in for predicting the peak hour I/I rate than shorter, more intense storm events. On average, estimates of peak-hour RDII flow rates using 3-hour storms were 25% less than estimates using the 24-hour storm events. In every case, the 95% confidence interval was tighter when using the 24-hour event data — indicating a higher level of confidence in the final result. That means that the proper duration rainfall event may be selected with a known level of confidence for hydraulic modeling and capacity management in those sewer systems. This study incorporated a non-proprietary procedure using standard spreadsheets and commonly accepted statistical parameters.
No Reference information available - sign in for access.
No Citation information available - sign in for access.
No Supplementary Data.
No Article Media
No Metrics

Keywords: BAMI; Flow Monitoring; Inflow & Infiltration; RDI/I; Sewer Capacity; Standardized Analysis

Document Type: Research Article

Publication date: 2010-01-01

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 These proceedings are not peer reviewed.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
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