Abstract
Setting of critical control and monitoring point trigger limits for water quality in managed aquifer recharge (MAR) schemes ensures human health, environmental, and operational risks are controlled. Application of a transferrable methodology for selection of appropriate critical limits and setting of alert limits for MAR systems is demonstrated for a storm water aquifer storage and recovery scheme used for nonpotable applications in Parafield, South Australia. This is the first demonstrated application of an approach incorporating hazard analysis and critical control point principles for setting water quality targets in a storm water MAR system consistent with Australian Water Recycling Guidelines and Australian and international drinking water guidelines. Salinity and Escherichia coli (E. coli) are used as example parameters but others follow the same principles. A decision tree was developed for systematic selection of relevant targets and setting of critical and alert limits. Up to 10 years of operational water quality data across the system were used for the analyses. Comparison of injected and recovered water using a stochastic model showed the aquifer could be expected to provide a mean E. coli removal of approximately . A mean E. coli reduction of 39% in the distribution system following a change in operational procedures was predicted using the probabilistic model. Long-term data were used to set alert limits for critical control and quality monitoring points in the system. Management actions following occasions where limits were not met are discussed.
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Acknowledgments
The authors acknowledge support of the partners to the Managed Aquifer Recharge and Stormwater Use Options research project. They are the National Water Commission through the Raising National Water Standards Program, the South Australian Government through the Goyder Institute for Water Research, CSIRO Water for a Healthy Country Program, City of Salisbury, the Adelaide and Mt Lofty Ranges Natural Resources Management Board, the South Australian Water Corporation, and the former United Water International.
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Information & Authors
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Published In
Journal of Hydrologic Engineering
Volume 20 • Issue 3 • March 2015
Copyright
© 2014 American Society of Civil Engineers.
History
Received: Oct 9, 2013
Accepted: Mar 12, 2014
Published online: Jun 24, 2014
Discussion open until: Nov 24, 2014
Published in print: Mar 1, 2015
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