About this map:

This map shows the distribution of rainfall in southern Guam. It uses different colors to show differences in total annual rainfall in different areas. This map is a digitized version of the map published by U.S. Geologic Survey (Stephen Gingerich, 2003, Water Resources of Guam, U.S. Geological Survey Water-Resources Investigations Report 03-4126) in cooperation with Water and Environmental Research Institute of the Western Pacific.