session structure overview definition & examples actions outputs challenges exercises
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Module 4 Control measures & risk reassessment. Session structure Overview Definition & examples Actions Outputs Challenges Exercises. Module 4 Control measures & risk reassessment. Overview Document existing and potential control measures Assess their effectiveness (validation) - PowerPoint PPT PresentationTRANSCRIPT
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Session structure
•Overview
•Definition & examples
•Actions
•Outputs
•Challenges
•Exercises
Module 4 Control measures & risk reassessment
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Overview
• Document existing and potential control measures
• Assess their effectiveness (validation)
• Recalculate risks accounting for existing control measures
• Prioritize risks
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Module 4 Control measures & risk reassessment
Control measure definition:
Any action or activity that can be used to prevent, eliminate or reduce to an acceptable level any water safety hazard
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Module 4 Control measures & risk reassessment
Examples – Control measures – low tech
Cover
Well headDesignated bucket
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Module 4 Control measures & risk reassessment
Examples – Control measures
Module 4 Control measures & risk reassessment
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Source water protected from livestock
Automated chlorine dosing system
Module 4 Control measures &
Actions
•Identify existing controls
•Document need for new control measures as necessary
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Identify control measures
Assess effectiveness
Reassess risks Prioritize risks
Module 4 Control measures & risk reassessment
Actions continued...
•Assess effectiveness (normal & exceptional circumstances)
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ValidationInvestigative activity to identify the effectiveness of
control measures. It provides the evidence that elements of the WSP can effectively meet the water
quality targets.
Module 4 Control measures & risk reassessment
Actions continued...
•Assess effectiveness (normal & exceptional circumstances)
•Monitoring
•Not in isolation but as part of process chain
•Data from studies / historical records
•Introducing contaminant – testing removal
•Sanitary surveys
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Module 4 Control measures & risk reassessment
Actions continued...
• Reassess risks accounting for effectiveness of control measures
•Based on long-term average performance
•Highlight where controls are not in place
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Module 4 Control measures & risk reassessment
Actions continued...
•Prioritize all identified risks
•Rank the reassessed risks
•Screen for critical risks
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Module 4 Control measures & risk reassessment
Outputs
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Module 4 Control measures & risk reassessment
Challenges
•Uncertainty in prioritizing risks
•Lack of knowledge
•Poor data
•Different approaches = different outcome
•Qualitative versus quantitative
•Assessing effectiveness of certain controls
•Catchment – how to measure/enforce?
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Module 4 Control measures & risk reassessment
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Exercise•In small groups•Part 1 (5 minutes)
• Match up hazardous events with suitable control measures
• Identify possible control measures for three hazardous events
•Part 2 (5 minutes)• Describe how these control measures can be validated
•Part 3 and 4 (20 minutes)• Reassess the likelihood and severity by considering the
implementation of control measures and rank the risks again from highest to lowest
Module 4 Control measures & risk reassessment