Pacific Islands Water Science Center

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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. 

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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. 

Date published: June 1, 2016

PIWSC Main Office--New Home

The main office of the Pacific Islands Water Science Center is located on Ford Island.

Publications

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Year Published: 2020

Local to landscape-level controls of water fluxes through Hawaiian forests: Effects of invasive animals and plants on soil infiltration capacity across substrate and moisture gradients

Given the potential effect of invasive plants and animals to water fluxes through forests, the invasive-driven degradation of native ecosystems is a topic of great concern for many downstream land and water managers. The infiltration rate determines the partitioning between runoff and infiltration into soil in Hawaiian forests and beyond. Thus, to...

Fortini, Lucas B.; Leopold, Christina; Perkins, Kimberlie; Chadwick, Oliver A.; Yelenik, Stephanie G.; Jacobi, James D.; Bishaw, Kaiena; Gregg, Makani; Rosa, Sarah N.
Fortini, L. B., C. Leopold, K. Perkins, O. Chadwick, S. Yelenik, J. Jacobi, K. Bishaw, II, M. Gregg, and S. Rosa. 2020. Local to landscape-level controls of water fluxes through Hawaiian forests: Effects of invasive animals and plants on soil infiltration capacity across substrate and moisture gradients. Hawai`i Cooperative Studies Unit Technical Report HCSU-TR095, University of Hawai'i at Hilo, Hilo. Available: http://hdl.handle.net/10790/5282.

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Year Published: 2020

Numerical simulation of groundwater availability in central Moloka‘i, Hawai‘i

Since the 1990s, increased chloride concentrations of water pumped from wells (much of which is used for drinking water) and the effects of withdrawals on groundwater-dependent ecosystems have led to concerns over groundwater availability on the island of Molokaʻi, Hawaiʻi. An improved understanding of the hydrologic effects of proposed...

Oki, Delwyn S.; Engott, John A.; Rotzoll, Kolja
Oki, D.S., Engott, J.A., and Rotzoll, K., 2020, Numerical simulation of groundwater availability in central Moloka‘i, Hawai‘i: U.S. Geological Survey Scientific Investigations Report 2019–5150, 95 p., https://doi.org/10.3133/sir20195150.

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Year Published: 2019

The ‘Ike Wai Hawai‘i groundwater recharge tool

This paper discusses the design and implementation of the ‘Ike Wai Hawai‘i Groundwater Recharge Tool, an application for providing data and analyses of the impacts of land-cover and climate modifications on groundwater-recharge rates for the island of O‘ahu. This application uses simulation data based on a set of 29 land-cover types and two...

McLean, Jared H.; Cleaveland, Sean B.; Rotzoll, Kolja; Izuka, Scot K.; Leigh, Jason; Jacobs, Gwen A.; Theriot, Ryan