1. Groundwater Assessment Platform
Free, interactive online GIS platform for mapping, statistical modeling and dissemination of information on natural groundwater contamination
Joel Podgorski, GAP Project Coordinator,
Michael Berg, GAP Project Manager,
Jay Matta, GAP Expert Hydrogeologist,
Swiss Federal Institute of
Aquatic Science and Technology

2. Groundwater Assessment Platform (GAP) www.gapmaps.org
Core functionality
PUBLIC
View existing models and data
PRIVATE (login)
Upload, display & share own data
Create own predictive model at all scales
Add publicly available layers to map and use in modeling
PDF ausdrucken können
COMMUNITY
Share data and models with user-created communities
Groundwater Assessment Platform (GAP)

3. Groundwater Assessment Platform (GAP) www.gapmaps.org
Share data publicly
Example: arsenic concentrations from Mexico
Groundwater Assessment Platform (GAP)

4. Groundwater Assessment Platform (GAP) www.gapmaps.org
Reach of GAP
Blue: registered users, Red: site visits
121 countries
Groundwater Assessment Platform (GAP)

5. Groundwater Assessment Platform (GAP) www.gapmaps.org
Overview geostatistical prediction modeling
Concentration data
Geo-statistical modeling
Identifying risk areas
Mitigation
Relevant geospatial data
Increasingly available in digital GIS format
Often free of charge
Resolution and coverage increasing
Groundwater Assessment Platform (GAP)

6. Groundwater Assessment Platform (GAP) www.gapmaps.org
1st global hazard map for As >10 µg/L
Groundwater Assessment Platform (GAP)

7. Groundwater Assessment Platform (GAP) www.gapmaps.org
Modeling comparison: China
Arsenic prediction map for China created offline
Arsenic prediction map for China created in GAP
Rodríguez-Lado et al., 2013
 Very similar results between modeling via manual coding and modeling with GAP
Groundwater Assessment Platform (GAP)

8. Groundwater Assessment Platform (GAP) www.gapmaps.org
Various organizations as users of GAP
UNICEF/WHO – have shared their independently created arsenic maps on GAP
UNICEF – plans to use GAP for supporting global WASH disaster preparedness
UNEP – possible collaboration with GAP on standardizing, sharing and modeling water quality data (pH, EC, nitrate, phospate, O2)
UNHCR – interested in modeling fluoride contamination in refugee camps
ICRC – plans to share/model data from a current borehole drilling campaign
IFRC – interested in using GAP to model (predict) natural groundwater contaminants and vector-borne diseases (e.g. malaria, zika, dengue)
International Atomic Energy Agency (IAEA) – interested in using GAP to evaluate aquifer vulnerability using stable isotope data
World Meteorological Organization (WMO) – interested in modeling with GAP
Aquagenx – recommending customers share their E. Coli data
Groundwater Assessment Platform (GAP)

9. Thank you