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SSO Evaluations: Infiltration and Inflow using SWMM RUNOFF and EXTRAN

Srinivas Vallabhaneni, Joseph Koran, Susan Moisio and Charles Moore (2002)
Camp Dresser & McKee; Camp Dresser & McKee
DOI: https://doi.org/10.14796/JWMM.R208-12
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Abstract

Rainfall dependent inflow and infiltration (RDI/I) into sanitary sewer systems has long been recognized as a source of operating problems in wastewater collection and treatment systems. RDI/I can cause sanitary sewer flows to increase during wet weather to rates that exceed the hydraulic capacity of the wastewater collection system in one or more locations. When this occurs, the hydraulic grade line is elevated to a level that can cause sanitary sewer overflows (SSOs), with the resulting surcharged flows entering basements, overflowing to the street surface through manholes, or discharging to nearby streams through constructed overflow points. RDI/I has also been observed to contribute to serious operating problems at wastewater treatment facilities, including hydraulic overloading and disruption of biological and other plant processes. Thus, the need to understand and control the RDI/I problem is crucial.

Two very different hydrologic processes are involved in the sanitary and combined sewer systems in response to wet weather. The more straightforward and well-understood process is that of the combined sewer system, where surface runoff is the predominant response. However, hydrologic processes in the sanitary sewer system are not as well understood, nor are they as accurately modeled with reasonably available data. As a result, empirical data are used to estimate the hydrologic response in the sanitary sewer system, rather than deterministically model the physical process. Attempts to simulate the sanitary sewer response using algorithms and tools developed for simulating combined sewer response typically yield less reliable results and solutions.

This chapter presents methodology to develop accurate sanitary sewer models which can be used to cost-effectively address wet-weather problems such as excessive RDI/I and resulting SSOs and basement backups.

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PAPER INFO

Identification

CHI ref #: R208-12 976
Volume: 10
DOI: https://doi.org/10.14796/JWMM.R208-12
Cite as: CHI JWMM 2002;R208-12

Publication History

Received: N/A
Accepted: N/A
Published: February 15, 2002

Status

# reviewers: 2
Version: Final published

Copyright

© 2002 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

Srinivas Vallabhaneni

Camp Dresser & McKee, Cincinnati, OH, USA
ORCiD:

Joseph Koran

Camp Dresser & McKee , Cincinnati, OH, USA
ORCiD:

Susan Moisio

Camp Dresser & McKee , Cincinnati, OH, USA
ORCiD:

Charles Moore

Camp Dresser & McKee, Cincinnati, OH, USA
ORCiD:


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