Water Resources
Hawaiʻi and the Pacific Islands
Hawaiʻi and the Pacific Islands
Pacific Islands Water Science Center
The USGS Pacific Islands Water Science Center conducts hydrologic monitoring and investigative studies on a wide variety of issues affecting water resources in the State of Hawaiʻi and the U.S. Affiliated Pacific Islands.
Science
Science
The USGS Pacific Islands Water Science Center provides reliable, objective scientific information to address water-related issues in Hawaiʻi and the Pacific Islands.
News
Community Meeting for Reimagining Molokaʻi's Wetlands
Community Meeting for Reimagining Molokaʻi's Wetlands
USGS Unveils Mobile Flood Tool for the Nation
USGS Unveils Mobile Flood Tool for the Nation
Adaptive management strategies for potential impacts of climate change on Guam
Adaptive management strategies for potential impacts of climate change on Guam
Publications
Effects of drought and cloud-water interception on groundwater recharge and wildfire hazard for recent and future climate conditions, Kauaʻi, Oʻahu, Molokaʻi, Maui, and the Island of Hawaiʻi
The Water-budget Accounting for Tropical Regions Model (WATRMod) code was used for Kauaʻi, Oʻahu, Molokaʻi, Maui, and the Island of Hawaiʻi to estimate the spatial distribution of groundwater recharge, soil moisture, evapotranspiration, and climatic water deficit for a set of water-budget scenarios. The scenarios included historical and future drought conditions, and a land-cover condition where s
Estimated groundwater recharge for mid-century and end-of-century climate projections, Kaua‘i, O‘ahu, Moloka‘i, Lāna‘i, Maui, and the Island of Hawai‘i
Demand for freshwater in the State of Hawaiʻi is expected to increase by roughly 13 percent from 2020 to 2035. Groundwater availability in Hawaiʻi is affected by a number of factors, including land cover, rainfall, runoff, evapotranspiration, and climate change. To evaluate the availability of fresh groundwater under projected future-climate conditions, estimates of groundwater recharge are needed
Groundwater and surface-water interactions in the He‘eia watershed, O‘ahu, Hawai‘i—Insights from analysis of historical data and numerical groundwater-model simulations
He‘eia and ‘Ioleka‘a Streams in the He‘eia watershed on O‘ahu, Hawai‘i, receive substantial discharge from dike-impounded groundwater. Previous studies indicated that groundwater withdrawals from the watershed affect streamflow. Resource managers and users seek information that can be used to balance the needs of competing uses of groundwater and streamflow in the watershed.In this study, analyses
Science
Effects of Drought and Cloud-Water Interception on Wildfire Hazard in Hawaiʻi
Understanding the effects of drought and cloud-water interception on wildfire hazard is critical to Hawai‘i’s water-resource managers, farmers, ranchers, and forest, watershed, and wildfire managers for developing adaptive management strategies. Identifying areas of increased wildfire hazard is also important for developing strategic monitoring programs to help assess and predict the effects of...
Groundwater Recharge in Hawaiʻi
Groundwater provides 99 percent of Hawai‘i’s drinking water and about 50 percent of all freshwater used in the State. Groundwater recharge is water derived from precipitation and other sources, such as irrigation and leakage from surface reservoirs, that moves through or bypasses the plant-soil system and replenishes aquifers. Groundwater availability in Hawai‘i is affected by changes in...
Effects of High-Priority Non-Native and Dominant Native Plant Species on the Water Cycle
The spread of highly-invasive non-native plant species in Hawaiʻi’s forests may be reducing freshwater availability across the islands. However, little information has been collected to determine the effects of highly-invasive non-native plant species on freshwater resources. The lack of information, in turn, limits the development of effective management strategies for preserving Hawaiʻi’s...