Pacific Islands Water Science Center

Home

Hydrologic Monitoring and Investigations

Hydrologic Monitoring and Investigations

The USGS Pacific Islands Water Science Center provides reliable, objective scientific information to address water-related issues in the State of Hawaiʻi and the U.S. Affiliated Pacific Islands. 

Learn More

News

Date published: October 7, 2019

Adaptive management strategies for potential impacts of climate change on Guam

Guam’s water demands are anticipated to increase. Potential impacts of sea-level rise and a changing climate on surface-water and groundwater resources are assessed. 

Date published: August 16, 2019

Understanding Freshwater Availability on Maui Under Projected Future Climate Conditions

Demand for freshwater on the island of Maui is expected to increase by 45 percent between 2015 and 2035. Wetter and drier climate scenarios impact the availability of groundwater to meet this demand. 

Publications

Publication Thumbnail
Year Published: 2021

Groundwater conditions and trends, 2009–19, Saipan, Commonwealth of the Northern Mariana Islands

Groundwater is the primary source of municipal water for Saipan. Nearly all groundwater for the municipal water supply is withdrawn from a freshwater-lens system with a limited amount of freshwater that is susceptible to saltwater intrusion. The status of Saipan’s groundwater resources has not been thoroughly assessed since 2003. The U.S....

Mitchell, Jackson N.; Presley, Todd K.; Carruth, Robert L.
Mitchell, J.N., Presley, T.K., and Carruth, R.L., 2021, Groundwater conditions and trends, 2009–19, Saipan, Commonwealth of the Northern Mariana Islands: U.S. Geological Survey Scientific Investigations Report 2020–5129, 51 p., https://doi.org/10.3133/sir20205129.

Publication Thumbnail
Year Published: 2021

Numerical simulation of the effects of groundwater withdrawal and injection of high-salinity water on salinity and groundwater discharge, Kaloko-Honokōhau National Historical Park, Hawaiʻi

Kaloko-Honokōhau National Historical Park (KAHO) is located on the west coast of the island of Hawaiʻi and contains water resources exposed in fishponds, anchialine pools, and marine waters that are cultural resources and that provide habitat for threatened, endangered, and other culturally important native species. KAHO’s water resources are...

Oki, Delwyn S.
Oki, D.S., 2021, Numerical simulation of the effects of groundwater withdrawal and injection of high-salinity water on salinity and groundwater discharge, Kaloko-Honokōhau National Historical Park, Hawaiʻi: U.S. Geological Survey Scientific Investigations Report 2021–5004, 59 p., https://doi.org/10.3133/sir20215004.

Publication Thumbnail
Year Published: 2021

Volcanic Aquifers of Hawai‘i—Construction and calibration of numerical models for assessing groundwater availability on Kaua‘i, O‘ahu, and Maui

Steady-state numerical groundwater-flow models were constructed for the islands of Kaua‘i, O‘ahu, and Maui to enable quantification of the hydrologic consequences of withdrawals and other stresses that can place limits on groundwater availability. The volcanic aquifers of Hawai‘i supply nearly all drinking water for the islands’ residents,...

Izuka, Scot K.; Rotzoll, Kolja; Nishikawa, Tracy
Izuka, S.K., Rotzoll, K., and Nishikawa, T., 2021, Volcanic Aquifers of Hawai‘i—Construction and calibration of numerical models for assessing groundwater availability on Kaua‘i, O‘ahu, and Maui: U.S. Geological Survey Scientific Investigations Report 2020-5126, 63 p., https://doi.org/10.3133/sir20205126.