1. MBRS Watershed Hydrology Río Motagua, Río Chamelecón and Río Ulúa Paul Kirshen & Ned Spang Río Motagua, Río Chamelecón and Río Ulúa Paul Kirshen & Ned Spang

2. WatershedsWatersheds an area of land within which all waters flow to a single river system ---Heathcote 1998 the specific land area that drains water into a river system or other body of water ---The World Bank an area of land within which all waters flow to a single river system ---Heathcote 1998 the specific land area that drains water into a river system or other body of water ---The World Bank

3. Features of a Typical Watershed Reef Overland flow Groundwater flow

4. Countries: Guatemala, Honduras Watershed Area: 12,670km2 Guatemala: 10,529 km2 Honduras: 2,141km^2 Average Annual Precipitation: 1,400 mm Length: 487 km Average Discharge: 530m^3/sec Countries: Guatemala, Honduras Watershed Area: 12,670km2 Guatemala: 10,529 km2 Honduras: 2,141km^2 Average Annual Precipitation: 1,400 mm Length: 487 km Average Discharge: 530m^3/sec Source: Gulf of Honduras: Preliminary Transboundary Diagnostic Analysis, Final Draft (August 2003) Abt Associates/ Woods Hole Group, Global Environment Facility--Inter- American Development Bank Project Development Facility (PDF-B), pp. 5-6. Photo Source: www.guate360.com/galeria/postcards.php Río Motagua

5. Río Motagua: Monthly Flow Hydrograph - 2004 (Morales) Resumen De Estaciones Hidrometricas De La Republica De Guatemala, (2005) INSIVUMEH, Guatemala.

6. Río Motagua: 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.

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

8. Lead in Río Motagua Río Motagua: Water Quality Source: adapted from Calidad de Agua de los Rios de La Republica de Guatemala (December 2003), INSIVUMEH, Guatemala

9. Phosphate – P Río Motagua: Water Quality 2 Source: adapted from Calidad de Agua de los Rios de La Republica de Guatemala (December 2003), INSIVUMEH, Guatemala

10. Total Dissolved SolidsTurbidity Río Motagua: Water Quality 3 Source: adapted from Calidad de Agua de los Rios de La Republica de Guatemala (December 2003), INSIVUMEH, Guatemala

11. Dissolved Oxygen (mg/L) Dissolved Oxygen Saturation (%) Río Motagua: Water Quality 4 Source: adapted from Calidad de Agua de los Rios de La Republica de Guatemala (December 2003), INSIVUMEH, Guatemala

12. Motagua: Conclusions Findings & Stresses: Sufficient water quantity to meet needs Natural hydrology: peak rainfall conducive to high levels of erosion Even the limited water quality shows water quality stress and the value of water quality sampling Potential exists for future water quality problems from point and non-point source threats Climate Change? Findings & Stresses: Sufficient water quantity to meet needs Natural hydrology: peak rainfall conducive to high levels of erosion Even the limited water quality shows water quality stress and the value of water quality sampling Potential exists for future water quality problems from point and non-point source threats Climate Change? Interventions: Expand water quantity and quality monitoring Manage land use to respond to present and potential water quality threats Ensure effective management of wastewater Harmonization of transboundary water management

13. Río Chamelecón Countries: Honduras Watershed Area: 4,350 km^2 Average Annual Precipitation: 1,445 mm/yr Length: 256 km Average Discharge: ~370m^3/sec Countries: Honduras Watershed Area: 4,350 km^2 Average Annual Precipitation: 1,445 mm/yr Length: 256 km Average Discharge: ~370m^3/sec Source: Gulf of Honduras: Preliminary Transboundary Diagnostic Analysis, Final Draft (August 2003) Abt Associates/ Woods Hole Group, Global Environment Facility--Inter-American Development Bank Project Development Facility (PDF-B), pp. 5-6. Image Source: pr.water.usgs.gov/public/ rt/hn/chamelecon.html

14. Río Chamelecón: Monthly Precipitation Source: Adapted from GIS Data Disc Provided By Secretaría de Agricultura (SAG), Honduras

15. Río Chamelecón: Monthly Flow Hydrograph (Chamelecón) Source: Secretaria de Recursos Naturales y Ambiente (SERNA), Direccion General de Recursos Hidricos, Departamento de Servicios Hidrologicos y Climatologicos (1972-1992)

16. Río Chamelecón : 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.

17. Río Chamelecón: Conclusions Findings & Stresses: Sufficient water quantity to meet needs Significant lack of 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 Significant lack of 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 quality monitoring programs Maintain consistent water quantity monitoring Manage land use to respond to potential water quality threats Ensure effective management of wastewater

18. Río Ulúa Countries: Honduras Watershed Area: 21,230 km^2 Average Annual Precipitation: 1,510 mm/yr Countries: Honduras Watershed Area: 21,230 km^2 Average Annual Precipitation: 1,510 mm/yr Source: Gulf of Honduras: Preliminary Transboundary Diagnostic Analysis, Final Draft (August 2003) Abt Associates/ Woods Hole Group, Global Environment Facility--Inter-American Development Bank Project Development Facility (PDF-B), pp. 5-6. Photo Source: http://trurl.acusd.edu/~najmici/zdjecia/pan_am/h_barbara1.jpg Length: 358 km Average Discharge: ~690 m^3/sec

19. Río Ulúa: Monthly Precipitation Source: Adapted from GIS Data Disc Provided By Secretaría de Agricultura (SAG), Honduras

20. Río Ulúa: Monthly Flow Hydrograph (Ulúa en Chinda) Source: Secretaria de Recursos Naturales y Ambiente (SERNA), Direccion General de Recursos Hidricos, Departamento de Servicios Hidrologicos y Climatologicos (1972-1992)

21. Río Ulúa: 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.

22. Río Ulúa: Conclusions Findings & Stresses: Sufficient water quantity to meet needs in most areas Significant lack of 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 in most areas Significant lack of 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: Plan for potential supply/demand imbalance in eastern portion of the watershed Develop effective water quality monitoring programs Maintain consistent water quantity monitoring Manage land use to respond to potential water quality threats Ensure effective management of wastewater

23. Motagua, Chamelecón and Ulúa: Hydrograph