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Vision-Based System for the Control and Measurement of Wastewater Flow Rate in Sewer Systems

L.S. Nguyen, B. Schaeli, D. Sage, S. Kayal, D. Jeanbourquin, D.A. Barry, L. Rossi

Water Science & Technology, vol. 60, no. 9, pp. 2281-2289, 2009.


Combined sewer overflows and stormwater discharges represent an important source of contamination to the environment. However, the harsh environment inside sewers and particular hydraulic conditions during rain events reduce the reliability of traditional flow measurement probes. In the following, we present and evaluate an in situ system for the monitoring of water flow in sewers based on video images. This paper focuses on the measurement of the water level based on image-processing techniques. The developed image-based water level algorithms identify the wall/water interface from sewer images and measure its position with respect to real world coordinates. A web-based user interface and a 3-tier system architecture enable the remote configuration of the cameras and the image-processing algorithms. Images acquired and processed by our system were found to reliably measure water levels and thereby to provide crucial information leading to better understand particular hydraulic behaviors. In terms of robustness and accuracy, the water level algorithm provided equal or better results compared to traditional water level probes in three different in situ configurations.

@ARTICLE(http://bigwww.epfl.ch/publications/nguyen0903.html,
AUTHOR="Nguyen, L.S. and Schaeli, B. and Sage, D. and Kayal, S. and
	Jeanbourquin, D. and Barry, D.A. and Rossi, L.",
TITLE="Vision-Based System for the Control and Measurement of Wastewater
	Flow Rate in Sewer Systems",
JOURNAL="Water Science \& Technology",
YEAR="2009",
volume="60",
number="9",
pages="2281--2289",
month="",
note="")

© 2009 IWA. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from IWA. This material is presented to ensure timely dissemination of scholarly and technical work. Copyright and all rights therein are retained by authors or by other copyright holders. All persons copying this information are expected to adhere to the terms and constraints invoked by each author's copyright. In most cases, these works may not be reposted without the explicit permission of the copyright holder.
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