Hydrology of the leeward aquifers, southeast Oahu, Hawaii

Water-Resources Investigations Report 85-4270
By: , and 



The leeward southeast Oahu ground-water area includes the Waialae and Wailupe-Hawaii Kai aquifers. The Waialae aquifer is separated from the ground water of Kaimuki to the west by Palolo valley fill and the Kaau rift zone, and from the Wailupe-Hawaii Kai aquifer to the east by a line of northeast-trending volcanic dikes. The distinct ground-water head changes across these boundaries indicate that the aquifers are separate, with little or no leakage between them. A water budget of leeward southeast Oahu determined the quantity and spatial distribution of ground-water recharge. These estimates of recharge, 6 million gallons per day over the Waialae area and 9.1 million gallons per day over the Wailupe-Hawaii Kai area, were used as input to a finite-element two-dimensional ground-water flow model. Ground-water heads were simulated in the modeled aquifer for several pumping scenarios. Projected pumpage from the recently drilled wells int he area is predicted to draw the water table down about one foot from its present mean position. The existing ground-water development of 1.4 million gallons per day is small compared to the quantity of ground water that flows through the area and discharges to the sea. Because the Waialae and Wailupe-Hawaii Kai aquifers are isolated from adjacent ground-water bodies, they can be fully developed without affecting ground-water resources outside the area.

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Publication type Report
Publication Subtype USGS Numbered Series
Title Hydrology of the leeward aquifers, southeast Oahu, Hawaii
Series title Water-Resources Investigations Report
Series number 85-4270
DOI 10.3133/wri854270
Year Published 1986
Language English
Publisher Geological Survey (U.S.)
Contributing office(s) Pacific Islands Water Science Center
Description vii, 75 p.
Country United States
State Hawaii
Other Geospatial Oahu
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