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Standardised survey method for identifying catchment risks to water quality.

D L Baker1, C M Ferguson1, P Chier1

  • 1GHD Pty Ltd, Level 6, 20 Smith St, Parramatta, New South Wales 2150, Australia

Journal of Water and Health
|June 10, 2016
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Summary
This summary is machine-generated.

A new systematic methodology quantifies risks to water quality in catchments. It identifies microbial and chemical contaminants from various sources, aiding in effective risk management for drinking water and recreational areas.

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Area of Science:

  • Environmental Science
  • Water Resource Management
  • Risk Assessment

Background:

  • Drinking water and recreational water quality are critical public health concerns.
  • Catchment-based risk assessment is essential for managing water quality.
  • Identifying and quantifying contaminant sources is a key challenge.

Purpose of the Study:

  • To develop and apply a systematic methodology for identifying and quantifying risks in drinking water and recreational catchments.
  • To assess microbial and chemical contaminants from diffuse and point sources.
  • To provide a tool for prioritizing risk management efforts.

Main Methods:

  • Utilized a sanitary survey process with a software tool to categorize hazards into six types.
  • Assessed risks based on the likelihood of site impact and potential consequences.
  • Integrated individual site risks to calculate cumulative risks at sub-catchment and catchment levels.
  • Incorporated contaminant transfer from upstream to downstream areas.

Main Results:

  • Developed risk matrices highlighting relative risk sources for index contaminants (e.g., Escherichia coli, protozoan pathogens, fuel, pesticides).
  • Identified key sources impacting water quality at sub-catchment and catchment scales.
  • Verified assessments and prioritized risks using water quality data and microbial source tracking.

Conclusions:

  • The developed methodology provides a systematic approach to risk assessment in catchments.
  • It effectively identifies and quantifies risks from various sources, aiding in water quality management.
  • The approach allows for prioritization of interventions to protect drinking and recreational water resources.