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Module 2 Describe the water supply system

Module 2 Describe the water supply system. Session structure Overview System components and description Outputs Challenges Factors to consider Exercise. Module 2 Describe the water supply system. Overview First task of WSP team Aim: To enable risks to be assessed and managed

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Module 2 Describe the water supply system

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  1. Module 2Describe the water supply system • Session structure • Overview • System components and description • Outputs • Challenges • Factors to consider • Exercise

  2. Module 2Describe the water supply system • Overview • First task of WSP team • Aim: To enable risks to be assessed and managed • Involves field investigations and local knowledge • Each system assessed on its own • Involves documentation, review and update

  3. Module 2Describe the water supply system System components Water supply and quality Land use Abstraction method and location Catchment Treatment Distribution User Filtration Coagulation Clarification Disinfection Networks Service reservoirs Tankers General public Potable

  4. Module 2Describe the water supply system • Description also involves • Knowing water quality standards • Assessing the likely changes to source water quality following changes in weather • Describing any interconnectivity of source waters (e.g. 2 wells, 1 aquifer) • Gathering information relating to water storage • Identifying the operational & managerial staff involved • Familiarization with existing documents relating to the supply • Etc.

  5. Supply flow diagram Tropical forest Coagulant & pH adjustment River catchment 1 pH Turbidity UV254 pH Turbidity UV254 pH Private connection pH pH Turbidity UV254 Run-off Output 1 Abstraction from river RAPID MIX FLOCCULATOR CLARIFICATION FILTRATION Raw water transfer Water treatment Water treatment Refer to C1 description Users City 1 Distribution system

  6. Module 2Describe the water supply system Output 2 – understanding of current water quality Regulatory limit Nitrate concentration leaving works

  7. Module 2Describe the water supply system Outputs 3 Identification of users and uses

  8. Module 2Describe the water supply system • Challenges • Out of date or no maps • Unknown catchment land use • Little stakeholder interaction / unknown stakeholders • Unknown risks • Limited staff time / resources available • Out-of-date documentation

  9. Module 2Describe the water supply system Factors to consider

  10. Module 2Describe the water supply system • Exercise – create a system flow diagram • In small groups • Use symbols to describe a supply system known to you • Describe from catchment to user • Add star where information is not known • Add banner to cross-reference to other documentation • List the most important items to consider • Plan how to obtain unknown information • 25 minutes

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