State of Water Resources: Assessing Climate Change Impacts on Water Resources

An inventory and vulnerability assessment of Haiti's water resources under climate change, produced under the National Adaptation Plan project. It sets out the method and definitions, then divides the country into its hydrographic units and works through them: the major watersheds, then basins grouped by size, including those between 100 and 200 square kilometers and those between 200 and 500.

The climate analysis is gridded rather than station-based, using the CHIRPS version 2 global rainfall product at 5 kilometer resolution, which is what allows a country with sparse gauge coverage to be assessed at all. It projects rainfall erosivity rising by 10 percent, and it crosses detected extremes with population density above 500 inhabitants per square kilometer per pixel, so exposure is expressed as people affected rather than as hazard alone. That crossing is the practical output: it identifies which basins combine a worsening rainfall regime with the density that turns runoff into a disaster.