About
Last Updated: 2025
This is the first version of the highest-resolution hydrologic map of Guam’s watersheds. The analysis builds on recent terrain and hydrologic studies of the Northern Guam Lens Aquifer, particularly the Surface Hydrology of the Northern Guam Lens Aquifer (WERI Technical Report 175), and continues through an iterative process that delineates runoff paths within surface depressions. The final stage—assigning place names to hydrologic features—was completed in collaboration with the Kumision I Fino’ CHamoru and the Kumision I Na’an Lugat Guåhan team.
WERI Technical Report No. 190
The technical report for this map is now available in the Sort & Search Library.
A PDF is also available for viewing and download, here.
Downloadable Map Content
Click on an item below to begin the file download.
GIS Files
The features (shapefiles) and rasters were used to build the map above. These GIS files were developed based on the technical report (coming soon), and is intended for scientific use and reference. Please see the technical report for details.
The file is a layers package of features and rasters. To use, simply drag/add into ArcGIS Pro’s (version 3.7, recommended) content panel.
