Global assessment of groundwater systems in SIDS
Leszek BIALY, UNESCO-IHP
What is TWAP?
2 years project funded by GEF providing global baseline assessment
of transboundary water systems
Five compo...
SIDS
American Samoa
Anguilla
Antigua and Barbuda
Aruba
Barbados
Belau/Palau
British Virgin Islands
Cape Verde
Comoros
Cook...
TBA Assessment Methodology
1. Mean annual groundwater recharge depth
2. Annual amount of renewable groundwater
resources p...
Data collection - Questionnaires
Complementary research by SFU
• Predominant aquifer lithology
• Predominant type of voids (pores, fissures, fissured karst...
OUTPUT
• Categorization of each SIDS on the basis of its
geomorphologic nature
• Categorization of each SIDS, including an...
Data base and Information Management System
•Documents
•Images
Geo-referenced
data:
•Core Indicators
•Main parameters
•Add...
Objectives
It is expected that the assessment will to find answers for following questions:
• What human and ecosystem use...
Global Objectives
• The assessment will respond to the need of GEF International Waters and
many Official Development Assi...
• Level 1 = baseline assessment: description and
indicator-based assessment of TBAs and SIDS
• Level 2 = in-depth assessme...
Thank you
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D1 02 leszek - twap sids (uk)

  1. 1. Global assessment of groundwater systems in SIDS Leszek BIALY, UNESCO-IHP
  2. 2. What is TWAP? 2 years project funded by GEF providing global baseline assessment of transboundary water systems Five components Transboundary Aquifers, and SIDS groundwater Transboundary River basins Transboundary Lake Basins and Reservoirs Large Marine Ecosystems (LME) Open Ocean
  3. 3. SIDS American Samoa Anguilla Antigua and Barbuda Aruba Barbados Belau/Palau British Virgin Islands Cape Verde Comoros Cook Islands C'wealth of the Northern Marianas Dominica Federated State of Micronesia Fiji French Polynesia Grenada Guam Jamaica Kiribati Maldives Marshall Islands Mauritius Montserrat Nauru Netherlands Antilles New Caledonia Niue Puerto Rico Saint Kitts and Nevis Saint Lucia Saint Vincent &the Grenadines Samoa Sao Tome & Principe Seychelles Singapore Solomon Islands The Bahamas Timor-Leste Tonga Trinidad & Tobago Tuvalu US Virgin Islands Vanuatu
  4. 4. TBA Assessment Methodology 1. Mean annual groundwater recharge depth 2. Annual amount of renewable groundwater resources per capita 3. Natural background groundwater quality 4. Human dependency on groundwater 5. Groundwater depletion 6. Groundwater pollution 7. Population density 8. Groundwater development stress 9. Groundwater management legal frameworks 10.Groundwater management institutional frameworks 10 core indicators
  5. 5. Data collection - Questionnaires
  6. 6. Complementary research by SFU • Predominant aquifer lithology • Predominant type of voids (pores, fissures, fissured karst, mixed) • Predominant hydraulic condition (confined, semi-confined, unconfined, mixed) • Depth: range(min-max)and average (location of top in meters below surface) • Thickness: range(min-max)and average (meters) • Transmissivity: range and average • Predominant sources of virgin recharge (precipitation, runoff influent streams, lakes, ect.) • Mean annual virgin recharge • Areal extent of recharge area • Predominant sources of natural discharge • Interlinked lakes, river systems and large marine ecosystems • Stored volume of fresh groundwater • Predominant natural groundwater quality
  7. 7. OUTPUT • Categorization of each SIDS on the basis of its geomorphologic nature • Categorization of each SIDS, including an inventory of collected data and information • Conceptual(representative) hydrogeological cross section for each representative SIDS • Values of groundwater indicators for each SIDS – including current state indicators and projected groundwater stress indicators organized as best as possible • Summary profile for each SIDS • GIS layers and related MS Access database summarizing the attributes of each SIDS
  8. 8. Data base and Information Management System •Documents •Images Geo-referenced data: •Core Indicators •Main parameters •Additional parameters One aggregated value per TBA or SIDS •Georeferenced Images • Projections Water GAP
  9. 9. Objectives It is expected that the assessment will to find answers for following questions: • What human and ecosystem users of the water resources are currently affected or impaired (use of conflicts, depletion and degradation) • How will water conditions and users develop during the next decades? Global change is likely to produce increased pressures during the next decades, such as higher water demands for food security/irrigation and domestic use, more intensive use of fertilizers and nitrogen, and increasing seawater intrusion in costal zones. • Where will all this problems be occurring? Increasing droughts or floods are observed in some areas and have been projected though modelling – these projections will be incorporated and summarized in this assessment
  10. 10. Global Objectives • The assessment will respond to the need of GEF International Waters and many Official Development Assistance providers, IFIs and governments to prioritize, and to focus scarce resources where they can be more cost- effective in addressing groundwater concerns; • It will allow to monitor evolving trends, and the impacts of GEF IW programs, and those of other agencies and actors; • It will bring to the global attention the vulnerability of water systems, and catalyze action.
  11. 11. • Level 1 = baseline assessment: description and indicator-based assessment of TBAs and SIDS • Level 2 = in-depth assessment, limited number of TBA case studies, extended set of indicators Level 1 – Level 2 Assessment
  12. 12. Thank you
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