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Identifying Wet-Weather Sanitary System Problems by Combining Field Investigations with Computer Modeling

Fang Cheng, Greg Barden, Julie A. McGill, John Schroeder and Edward Burgess (2009)
CDM Smith; City of Columbus
DOI: https://doi.org/10.14796/JWMM.R235-10
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Abstract

The combination of field investigation and hydraulic modeling is an effective tool to identify the causes of basement flooding. Field investigation (closed conduit televising) provides detailed information on conditions of the sanitary sewer system, while computer modeling assists in developing a better understanding of overall system performance by allowing an investigation of system response under a range of scenarios that may not be witnessed in the field. During the Livingston/James Sewer System Inflow and Infiltration (I/I) Project (City of Columbus, Ohio), over 700,000 linear feet or 130 mi (213,000 m or 213 km) of sanitary sewer was cleaned and televised, 273 homes were tested to identify the sources of I/I contribution. The information gathered from the field investigation was used as a resource for model calibration and quality assurance/quality control (QA/QC). Meanwhile, a hydraulic model (including sanitary sewers with diameter 8 in. (200 mm) and larger) was applied to quantify the impacts of operation and maintenance and system capacity deficiency.

By comparing the locations of deficient sewer carrying capacity with the patterns of historical water-in-basement (WIB) complaints, the authors summarized the causes of the complaints into two categories: system capacity deficiencies and localized insufficient operations and maintenance(e.g. roots, deposits, etc.). Based on the causes, the recommended solutions include both system capacity improvements (replacement pipes, parallel relief pipes, etc.) and local solutions (back flow prevention devices, roottreatment, cleaning, etc.).

This chapter discusses what the potential improvements would have been without routine sewer maintenance, and demonstrates that either field investigation or a modeling approach alone is insufficient to fully understand and identify wet-weather sanitary system problems. It is the combination of these two activities that may prove to be the best approach in understanding the collection system performance.

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PAPER INFO

Identification

CHI ref #: R235-10 794
Volume: 17
DOI: https://doi.org/10.14796/JWMM.R235-10
Cite as: CHI JWMM 2009;R235-10

Publication History

Received: N/A
Accepted: N/A
Published: February 15, 2009

Status

# reviewers: 2
Version: Final published

Copyright

© 2009 CHI. Some rights reserved.

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Creative Commons License
This work is licensed under a Creative Commons Attribution 4.0 International License.

The Journal of Water Management Modeling is an open-access (OA) publication. Open access means that articles and papers are available without barriers to all who could benefit from them. Practically speaking, all published works will be available to a worldwide audience, free, immediately on publication. As such, JWMM can be considered a Diamond, Gratis OA journal.

All papers published in the JWMM are licensed under a Creative Commons Attribution 4.0 International License (CC BY).

JWMM content can be downloaded, printed, copied, distributed, and linked-to, when providing full attribution to both the author/s and JWMM.


AUTHORS

Fang Cheng

CDM Smith, Columbus, OH, USA
ORCiD:

Greg Barden

City of Columbus, Columbus, OH, USA
ORCiD:

Julie A. McGill

CDM Smith, Columbus, OH, USA
ORCiD:

John Schroeder

CDM Smith, Columbus, OH, USA
ORCiD:

Edward Burgess

CDM Smith, Cincinnati, OH, USA
ORCiD:


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