1. MBRS Watershed Hydrology Yucatán Peninsula & Río Hondo

2. Yucután Peninsula Countries: Mexico (Quintana Roo State) State/Watershed Area: 50,212 km2 Average Discharge: 7,700 Mm3/year Average Annual Rainfall: 1,258 mm Countries: Mexico (Quintana Roo State) State/Watershed Area: 50,212 km2 Average Discharge: 7,700 Mm3/year Average Annual Rainfall: 1,258 mm Source: Sinopsis Geohidrologia del Estado de Quintana Roo, Secretaria de Agricultura y Recursos Hidraulicos, Comision Nacional de Agua CAN, 1988 Rainfall Source: Source: Statistics: Water in Mexico, Edición 2004, Unified System for Basic Data on Water (SUIBA), SEMARNAT, CNA.

3. Quintana Roo Department: Monthly Precipitation Source: Statistics: Water in Mexico, Edición 2004, Unified System for Basic Data on Water (SUIBA), SEMARNAT, CNA.

4. Quintana Roo: Water Use/ Availability Source: Vorosmarty, C. J., P. Green, J. Salisbury and R. B. Lammers. 2000. Global water resources: vulnerability from climate change and population growth, Science, 289: 284-288.

5. Yucatán: Water Quality - Groundwater 2002: national water quality monitoring network was redesigned: Primary network = 362 permanent stations: 205 surface, 44 coastal, 113 aquifers. Secondary network = 276 mobile stations: 231 surface, 17 coastal, and 28 aquifers. Reference Network = 104 additional stations explicitly for groundwater. Aquifers in Quintana Roo Dept. and Yucatan State: not overexploited, no significant salt-water intrusion, soil salinization or brackish groundwater 2002: national water quality monitoring network was redesigned: Primary network = 362 permanent stations: 205 surface, 44 coastal, 113 aquifers. Secondary network = 276 mobile stations: 231 surface, 17 coastal, and 28 aquifers. Reference Network = 104 additional stations explicitly for groundwater. Aquifers in Quintana Roo Dept. and Yucatan State: not overexploited, no significant salt-water intrusion, soil salinization or brackish groundwater Source: Statistics: Water in Mexico, Edición 2004, Unified System for Basic Data on Water (SUIBA), SEMARNAT, CAN, p. 44, p. 35.

6. Yucatán: Water Quality - Surface Water Biochemical Oxygen Demand (BOD): 100% of Yucatan peninsula stations show unpolluted with BOD less than 6mg/L (typical of natural waters) Chemical Oxygen Demand (COD): 86.6% of Yucatan stations show unpolluted COD (less than 20 mg/L, typical of natural waters) 6.7% show good quality (20mg/L<X<100mg/L, water with organic matter) 6.7% show Indications of pollution (100mg/L<X<250mg/L, presence of wastewater, mostly urban) Biochemical Oxygen Demand (BOD): 100% of Yucatan peninsula stations show unpolluted with BOD less than 6mg/L (typical of natural waters) Chemical Oxygen Demand (COD): 86.6% of Yucatan stations show unpolluted COD (less than 20 mg/L, typical of natural waters) 6.7% show good quality (20mg/L<X<100mg/L, water with organic matter) 6.7% show Indications of pollution (100mg/L<X<250mg/L, presence of wastewater, mostly urban) Source: Statistics: Water in Mexico, Edición 2004, Unified System for Basic Data on Water (SUIBA), SEMARNAT, CAN, p. 44.

7. Yucatán: Conclusions Findings & Stresses: Sufficient water quantity to meet needs Summary of water quality: presently there are minimal water quality problems Potential exists for future water quality problem from point and non-point source threats Climate change? Findings & Stresses: Sufficient water quantity to meet needs Summary of water quality: presently there are minimal water quality problems Potential exists for future water quality problem from point and non-point source threats Climate change? Interventions: Continue and expand water quantity and quality monitoring programs Manage land use to respond to potential water quality threats Ensure effective management of wastewater

8. Río Hondo Countries: Mexico, Belize, Guatemala Watershed Area: 14,708 km^2 Mexico: 8,825 km^2 Belize: 3,010 km^2 Guatemala: 2,873 km^2 Average Annual Precipitation: 1,574 mm Length: 205 km Average Discharge: N/A Source: Statistics: Water in Mexico, Edición 2004, Unified System for Basic Data on Water (SUIBA), SEMARNAT, CAN, p. 35. Photo source: http://www.elbalero.gob.mx/explora/images/quintana/qroopaisa.gif

9. Río Hondo: Water Use/ Availability Source: Vorosmarty, C. J., P. Green, J. Salisbury and R. B. Lammers. 2000. Global water resources: vulnerability from climate change and population growth, Science, 289: 284-288.

10. Water Quality Stations Station 1a Puente Orellan a Gualan Río Hondo: -Station 1a Río Motagua: -Gualán -Puente Orellana

11. Dissolved Oxygen (mg/L) Dissolved Oxygen Saturation (%) Río Hondo: Water Quality, 2004 Source: Monitoreo De La Contaminación Marina En La Bahía De Chetumal, Reporte Anual 2003 and 2004, Secretaria De Marina - Armada De Mexico, Sector Naval Yukalpeten, Direccion General Adjunta De Oceanografia, Estacion De Investigacion Oceanografica Progreso, Yuc.

12. Phosphate – P Río Hondo: Water Quality 2 2004 Source: Monitoreo De La Contaminación Marina En La Bahía De Chetumal, Reporte Anual 2003 and 2004, Secretaria De Marina - Armada De Mexico, Sector Naval Yukalpeten, Direccion General Adjunta De Oceanografia, Estacion De Investigacion Oceanografica Progreso, Yuc.

13. Diagnostic for Sustainable Water Management in the International Río Hondo Watershed, Mexico-Belize, 2025 Study Objectives - Natural Framework: Climate, Geology, Flora and Fauna Surface and Subterranean Hydrography Water Quality Extreme Meteorological Phenomena State of water-related soil degradation Study Objectives - Natural Framework: Climate, Geology, Flora and Fauna Surface and Subterranean Hydrography Water Quality Extreme Meteorological Phenomena State of water-related soil degradation Source: Terminos de Referencia para la Realización del Estudio Diagnóstico para el Manejo Sustenable del Agua en la Cuenca Internacional del Rio Hondo, México-Belice, al Año 2025, Comisión Nacional del Agua, Gobierno del Estado de Quintana Roo, Mayo 2004 Study Objectives - Additional Frameworks: Socioeconomic and Demographic Legal and Institutional Water Sustainability

14. Río Hondo: Conclusions Findings & Stresses: Sufficient water quantity to meet needs Currently a significant lack of both quantity and water quality data Potential exists for future water quality problems from point and non-point source threats Natural hydrology: peak rainfall conducive to high levels of erosion Climate Change? Findings & Stresses: Sufficient water quantity to meet needs Currently a significant lack of both quantity and water quality data Potential exists for future water quality problems from point and non-point source threats Natural hydrology: peak rainfall conducive to high levels of erosion Climate Change? Interventions: Develop effective water quantity and quality monitoring programs Manage land use to respond to potential water quality threats Ensure effective management of wastewater Improve coordination for transboundary watershed management