1. Department of Earth and Environmental Sciences University of Texas at Arlington Arlington Texas USA
2. Department of Geography and Water and Global Change Observatory University of Costa Rica San José Costa Rica
3. Civil and Environmental Engineering Washington State University Washington USA
4. Stable Isotopes Research Group & Water Resources Management Laboratory, Chemistry School Universidad Nacional Heredia Costa Rica
5. Empresa de Servicios Públicos de Heredia, ESPH S.A. Heredia Costa Rica
6. Escuela de Física & Centro de Investigaciones Geofísicas, CIGEFI Universidad de Costa Rica San José Costa Rica
7. Centro de Investigación en Contaminación Ambiental, CICA Universidad de Costa Rica San José Costa Rica
8. Department of Earth and Atmospheric Sciences University of Houston Houston Texas USA
9. Department of Earth, Environmental and Planetary Science Rice University Houston Texas USA