Skip to main content

EVALUATION OF SPATIAL AND TEMPORAL VARIABILITY OF STORM EVENTS: APPLICATION TO CSO FACILITY DESIGN

Buy Article:

$9.50 plus tax (Refund Policy)

Or sign up for a free trial

In the state of Washington, one method of evaluating combined sewer overflow reduction methods is via the utilization of models that simulate historical rainfall and subsequent runoff, sanitary flows, and collection system hydraulic dynamics where the simulated combined sewer o overflow frequencies and volumes are evaluated to assess regulatory compliance. The results of this work showed that the storm data (and the underlying storm dynamics) at local City of Spokane rain gages, which only have 6 years of data, differed statistically significantly from, and could be correlated with, precipitation measured at the regional Spokane International Airport rain gage, which has over 50 years of data. Based on statistical analyses of the differences between Airport and City rain gage rainfall volumes, regressions between these differences and distance from the Airport gage to the City rain gage provided a correlation coefficient of 0.64. This linear regression was then extended to the each combined sewer overflow basin to developed basin-specific design storms that are scaled from the Airport rain data. The benefit of developing customized rainfall data for each CSO basin based on regressions between the local gages and the City gage, can be demonstrated by comparing to two single, system-wide design storm scenarios: 1) use of the largest regression multiplier times the SIA data to ensure compliance for the worst-case basin and 2) use of the airport data directly. Using the first case, CSO reduction facilities were over-designed by approximately 70%, corresponding to increased costs of approximately 40 to 60 million, whereas, in the second case, CSO facilities would be under-designed by approximately 35%, corresponding to potential regulatory violations over one third of the time.
No Reference information available - sign in for access.
No Citation information available - sign in for access.
No Supplementary Data.
No Data/Media
No Metrics

Document Type: Research Article

Publication date: 2002-01-01

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