Date post: | 14-Nov-2014 |
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Education |
Upload: | food-and-agriculture-organization-of-the-united-nations |
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Coping with water scarcity
Water accounting: getting the water budget right
The conceptual framework
• What is scarcity? • How to conceptualize water scarcity?• How to quantify water scarcity?• What response options are available ?• How to establish priorities?
Defining water scarcity
“an excess of water demand over available supply”
Scrutinizing water balance
Measuring water scarcity
Water accounting – mapping supply and demand:• Volumes and Flows• Quality• Water use:
• consumptive, non consumptive; • formal, informal
• Efficiencies and return flow• Non beneficial ‘losses’
Water accounting
• Environmental-Economic Accounting for Water (SEEAW)
• Water cost curve approach• Participatory groundwater monitoring • Trade in water rights • Water accounting for firms• Water footprint Network• Remote Sensing based Water accounting
Water accounting
• Environmental-Economic Accounting for Water (SEEAW)
Water accounting
• Environmental-Economic Accounting for Water (SEEAW)- Merits:
Standardized approachConsistent with other types of Environmental-Economic Accounting
- Drawbacks:Huge amount of data requiredMethodology focusses on stocks rather than
flows
Water accounting• Water cost curve approach
Water accounting
• Water cost curve approach- Methodological drawbacks:
Measures are inter dependentCosts and benefits cannot be summedDownstream impacts are not taken into
account- Merits:
Planning toolNegotiation tool
Water accounting
• Participatory groundwater monitoring- FAO project in Andra-Pradesh - 4500 farmers in 630 communitees- Measure daily rainfall and fortnightly groundwater levels- Groundwater committees recommend water management practices
Water accounting
• Trade in water rights (Australia)- General Purpose Water Accounting Reports
prepared by Water Managersfor Water Users, Water Traders,
Environmental Organizations , Policy Makers- Needs detailed information on volumes of water used- Needs clear legislation and law enforcement
Water accounting
• Water accounting for firms- Reduce reputational risk- Life Cycle Assessment- Global water tool (WBCSD) Global sustainability tool (GEMI)- Methodological challenges:
traceability;consumptive vs non- consumptive use;renewable vs non renewable water
resources
Water accounting
• Water footprint Network- Water use per product - Useful to show impact of consumption patterns - Methodological challenges:
traceability;consumptive vs non- consumptive use;rainfed vs irrigated agriculture (green vs
blue)
Water accounting
• Remote Sensing based Water accounting- Measures water consumption- Area based- Suitable for agriculture (irrigated, rainfed) and natural land use- Not suitable for Industry and Municipalities- Does not take into account withdrawals and return flow
From water accounting to water auditing
Water auditing methodology overview
Component 1:
Land and water resources database
Component 2:
Water resources availability assessment
Component 3:
Water resources use assessment
Component 5:
Decision support tool
Component 4:
Water resources policy review
Component 6:
Water Audit concluding comprehensive and
summary reports
Rapid water accounting methodology overview
Component 1:
Land and water resources database
Component 2:
Water resources availability assessment
Component 3:
Water resources use assessment
Component 4:
Analysis
Component 1: Land and water resources database
Statistical databases
• AQUASTAT• FAOSTAT
Spatial databases
• Climate• Soils• River basins• Irrigation• Population• Cattle density
Component 2: Component 3:
Component 4: Analyses