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An Improved Water Distribution System Chlorine Decay Model Using EPANET MSX

Walter M. Grayman, Sudhir Kshirsagar, Melixa Rivera-Sustache and Mark Ginsberg (2012)
Engineering Consultant; Global Quality Corp.; USACE
DOI: https://doi.org/10.14796/JWMM.R245-21
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Abstract

One of the most common uses of water distribution system water quality modeling is to simulate the chlorine residual in the network. Most standard software packages such as EPANET model the decay of chlorine using a bulk decay rate and a wall decay coefficient. In EPANET, the bulk decay rate is either defined as a single constant for the entire distribution system or is assigned different fixed values for specific pipes. If there are multiple sources within a distribution system that produce finished water with different chlorine decay characteristics, it is not possible within EPANET to accurately represent the decay in areas of the system where the water from multiple sources is blended.

The multiple species extension (MSX) to EPANET allows the user to create a simple text file (MSX file) that more accurately represents the bulk decay when there are multiple sources with different decay rates. This chapter describes how an MSX file was developed that first calculated the percentage of water coming from each source to each pipe over time, and secondly used the percentages to calculate a bulk decay rate for each pipe for each time step as a weighted combination of the bulk decay rate for each of the multiple sources.

This MSX representation was tested and demonstrated using the standard EPANET NET3 distribution system example, and is currently being applied to a water distribution system at an army base. Similar MSX representations can be written to simulate other parameters such as disinfection byproducts.

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PAPER INFO

Identification

CHI ref #: R245-21 733
Volume: 20
DOI: https://doi.org/10.14796/JWMM.R245-21
Cite as: CHI JWMM 2012;R245-21

Publication History

Received: N/A
Accepted: N/A
Published: February 15, 2012

Status

# reviewers: 2
Version: Final published

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© 2012 CHI. Some rights reserved.

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

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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

Walter M. Grayman

Engineering Consultant, Cincinnati, OH, USA
ORCiD:

Sudhir Kshirsagar

Global Quality Corp., Covington, KY, USA
ORCiD:

Melixa Rivera-Sustache

USACE, Champaign, IL, USA
ORCiD:

Mark Ginsberg

USACE, Champaign, IL, USA
ORCiD:


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