Session structure Overview Definition & examples Actions Outputs Challenges Exercises

Module 4Control measures & risk reassessment • Session structure • Overview • Definition & examples • Actions • Outputs • Challenges • Exercises

Module 4Control measures & risk reassessment • Overview • Document existing and potential control measures • Assess their effectiveness (validation) • Recalculate risks accounting for existing control measures • Prioritize risks

Module 4Control 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

Module 4Control measures & risk reassessment Examples –Control measures – low tech Cover Well head Designated bucket

Module 4Control measures & risk reassessment Module 4Control measures & Examples –Control measures Automated chlorine dosing system Source water protected from livestock

Module 4Control measures & risk reassessment • Actions • Identify existing controls • Document need for new control measures as necessary Identify control measures Assess effectiveness Reassess risks Prioritize risks

Module 4Control measures & risk reassessment • Actions continued... • Assess effectiveness (normal & exceptional circumstances) Validation Investigative 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 4Control 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

Module 4Control 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

Module 4Control measures & risk reassessment • Actions continued... • Prioritize all identified risks • Rank the reassessed risks • Screen for critical risks

Module 4Control measures & risk reassessment Outputs

Module 4Control 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?

Module 4Control measures & risk reassessment • 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

Session structure Overview Definition & examples Actions Outputs Challenges Exercises