Hawai‘i Geothermal Digital Collection

The Hawai‘i Geothermal Digital Collection digitizes and disseminates data and information relating to geothermal exploration and development in Hawai‘i and participates in the National Geothermal Data System project. The collection includes documents, photographs, maps, and videos. The collection includes over 1,000 digital documents are freely available online.

Hawai‘i State Water Wells

The Hawai‘i State Water Well project lists water wells and additional information in tabular/database format. This project digitized all of the water well files at the Department Land and Natural Resources, Commission of Water Resource Management (CWRM).

Hawai‘i Play Fairway Project

The U.S. Department of Energy-funded Hawaii Play Fairway project has provided the first updated geothermal resource assessment for the State of Hawaii since 1985. In Phase 1, the project identified, compiled, and ranked existing datasets related to geothermal resources, developed a statistical methodology to evaluate subsurface resource probability, and identified a roadmap for future exploration activities. In Phase 2, the project collected new groundwater data from the ten locations; geophysical data on the islands of Lanai, Maui, and central Hawaii; and modeled the effect of topographically induced stress to further characterize subsurface permeability.

Hydrogeochemistry of Lāna‘i’s Groundwater

This proposed project is an effort by the University of Hawai‘i to better understand the unique hydrology of the Lāna‘i Island. Water wells within the Pālāwai Basin, the caldera region of Lāna‘i volcano, tap high level brackish water that is at elevated temperatures. This is the only location in the state where brackish water exists above sea level, and here it is hundreds of feet above sea level. The origin of this high-level brackish water is unknown. The proposed action is to deepen two existing wells within Lāna‘i’s Pālāwai Basin using core drilling technology (core will be less than 4 inches diameter). This study will improve the overall understanding of the groundwater system within the Island of Lāna‘i and therein provide valuable information for conservation of this resource. It will expand our understanding of the dynamics of groundwater systems within specific geologic regimes (the caldera regions of the Hawaiian volcanoes), which is applicable to groundwater management statewide. Although the preparation of an EA for small diameter test wells is often waived, we have elected to prepare this document to evaluate any environmental impacts of this program, and to ensure that stakeholders are informed and able to provide input on the project.

Humu‘ula Groundwater Research Project

The U.S. Army-funded Humuʻula Groundwater Research Project (HGRP) drilled two test holes in Hawaiʻi Island’s ‘Saddle’ region between Mauna Loa and Mauna Kea volcanoes to investigate groundwater resources. Results included the discovery of: i) groundwater at a much shallower depth than expected, ii) a dike-impounded aquifer, and iii) a potential geothermal reservoir. HGRP collected a continuous sequence of rock core, making a complete stratigraphic record of the region, and documenting the area’s environmental, geologic, hydrologic, and thermal history.