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Standardised survey method for identifying catchment risks to water quality

D. L. Baker, C. M. Ferguson, P. Chier, M. Warnecke, A. Watkinson
Available Online 19 December 2015, wh2015054; DOI: 10.2166/wh.2015.054
D. L. Baker
GHD Pty Ltd., Level 6, 20 Smith St, Parramatta, New South Wales 2150, Australia E-mail: Danielle.Baker@ghd.com
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C. M. Ferguson
GHD Pty Ltd., Level 6, 20 Smith St, Parramatta, New South Wales 2150, Australia E-mail: Danielle.Baker@ghd.com
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P. Chier
GHD Pty Ltd., Level 6, 20 Smith St, Parramatta, New South Wales 2150, Australia E-mail: Danielle.Baker@ghd.com
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M. Warnecke
GHD Pty Ltd., Level 6, 20 Smith St, Parramatta, New South Wales 2150, Australia E-mail: Danielle.Baker@ghd.com
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A. Watkinson
Seqwater, PO Box 16146, City East, Brisbane, Queensland 4002, Australia
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Abstract

This paper describes the development and application of a systematic methodology to identify and quantify risks in drinking water and recreational catchments. The methodology assesses microbial and chemical contaminants from both diffuse and point sources within a catchment using Escherichia coli, protozoan pathogens and chemicals (including fuel and pesticides) as index contaminants. Hazard source information is gathered by a defined sanitary survey process; involving use of a software tool which groups hazards into six types: sewage infrastructure, on-site sewage systems, industrial, stormwater, agriculture and recreational sites. The survey estimates the likelihood of the site affecting catchment water quality, and the potential consequences, enabling the calculation of risk for individual sites. These risks are integrated to calculate a cumulative risk for each sub-catchment and the whole catchment. The cumulative risks process accounts for the proportion of potential input sources surveyed and for transfer of contaminants from upstream to downstream sub-catchments. The output risk matrices show the relative risk sources for each of the index contaminants, highlighting those with the greatest impact on water quality at a sub-catchment and catchment level. Verification of the sanitary survey assessments and prioritisation is achieved by comparison with water quality data and microbial source tracking.

  • catchment
  • chemicals
  • pathogens
  • QMRA
  • risk
  • sanitary survey
  • First received 5 March 2015.
  • Accepted in revised form 22 October 2015.
  • © IWA Publishing 2015

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SELECTED ISSUE

Journal of Water and Health: 16 (2)
  Volume 16,issue 2

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Standardised survey method for identifying catchment risks to water quality
D. L. Baker, C. M. Ferguson, P. Chier, M. Warnecke, A. Watkinson
Journal of Water and Health Dec 2015, wh2015054; DOI: 10.2166/wh.2015.054
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Standardised survey method for identifying catchment risks to water quality
D. L. Baker, C. M. Ferguson, P. Chier, M. Warnecke, A. Watkinson
Journal of Water and Health Dec 2015, wh2015054; DOI: 10.2166/wh.2015.054

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Keywords

catchment
chemicals
pathogens
QMRA
risk
sanitary survey
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