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Geophysical survey, ground water evaluation, Kaupulehu Project, Kulolo Quadrangle, Island of Hawaii

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Title:Geophysical survey, ground water evaluation, Kaupulehu Project, Kulolo Quadrangle, Island of Hawaii
Authors:Nance, Tom
Big Island
LC Subject Headings:Geology--Hawaii
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Date Issued:26 Apr 1990
Publisher:Blackhawk Geosciences, Inc.
Tom Nance Water Resource Engineering
Abstract:"This report contains the results of a geophysical survey to assist the evaluation of fresh water resources near Puu Nahaha, Kulolo Quadrangle, on the Island of Hawaii. The work was performed by Blackhawk Geosciences, Inc. (BGI) for Potomac Investment Associates (PIA) on the Kaupulehu Project on April 1 through 4, 1990.
The objectives for the geophysical survey can be understood from the hydrogeologic cross-section, typical of a volcanic island. The volcanic rocks are generally highly permeable and rainfall rapidly infiltrates into the ground and migrates downward to the water table, and eventually discharges into the ocean. Fresh water in these settings is found in two environments: 1. Dike-confined waters -- Typically, above the rift zone, intrusive dikes originating from a magma source below can form ground water dams, and behind these natural dams significant quantities of ground water can be stored. 2. Basal fresh water -- The high permeability of the volcanic rocks allows sea water to enter freely under the island, and a delicate balance is reached where a lens of fresh water floats on sea water. In cases of hydrostatic equilibrium, the Ghyben-Herzberg relation states that for every foot of fresh water head above sea level there will be about 40 ft of fresh water below sea level. The specific geophysical method employed was time domain electromagnetic (TDEM) soundings. This method was selected because it has proven effective in prior surveys in similar settings in Hawaii."
Pages/Duration:45 pages
Appears in Collections: Big Island
Tom Nance Water Resource Engineering

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