Use the National Centers for Environmental Information website to obtain long-term rainfall data (over 10 years) for the project location (http://www.ncdc.noaa.gov/cdo-web/results). If rainfall data for the project location is not available through this database, the databases of the UN Food and Agriculture Organization (FAO) and Aquastat can be good sources of information for country-level data. Just remember that local-level data is best, and country-level data should be used only if necessary.