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CSO Discharge Reporting using a Continuous Modeling Approach

Srinivas Vallabhaneni, Bob Masbaum, Carl C. Chan and Mario Mazza (2007)
CDM Smith; City of Indianapolis
DOI: https://doi.org/10.14796/JWMM.R227-15
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Abstract

Many combined sewer communities in the United States require reporting combined sewer overflow (CSO) discharges to a state regulatory agency on a regular basis to satisfy National Pollution Discharge Elimination System (NPDES) permit requirements. Typically, these requirements include gathering discharge data using automatic flow meters in each outfall and develop the CSO discharge monitoring reports (DMR).

Reliable and consistent approaches are critical in preparing ongoing CSO discharge reports to satisfy NPDES permit requirements and to track long-term trends in discharges. Outfall flow monitoring presents many challenges and relying upon the outfall monitoring equipment alone to estimate overflow volumes may lead to inconsistent and unreliable information. The DMR data reported based entirely on monitoring data may add more complexity (in addition to the rainfall variations, system changes, etc.) when assessing the efficacy of implemented CSO controls. Continuous simulations with the interceptor hydraulic model supported by CSO activation monitoring data is the most cost-effective, reliable, and consistent method for generating continuous CSO discharge data to meet permit requirements.

This chapter will present a case study based on extensive experience in preparing CSO DMRs for the City of Indianapolis, Indiana by applying the calibrated sewer system hydraulic model on a continuous basis. Continuous modeling techniques and protocols developed for a complex Indianapolis sewer system are presented along with important lessons learned.

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PAPER INFO

Identification

CHI ref #: R227-15 848
Volume: 15
DOI: https://doi.org/10.14796/JWMM.R227-15
Cite as: CHI JWMM 2007;R227-15

Publication History

Received: N/A
Accepted: N/A
Published: February 15, 2007

Status

# reviewers: 2
Version: Final published

Copyright

© 2007 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

CDM Smith, Indianapolis, IN, USA
ORCiD:

Bob Masbaum

City of Indianapolis, Indianapolis, IN, USA
ORCiD:

Carl C. Chan

CDM Smith, Cincinnati, OH, USA
ORCiD:

Mario Mazza

City of Indianapolis, Indianapolis, IN, USA
ORCiD:


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