Pacific Islands Water Science Center
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Recent Hydrologic Conditions -- HawaiiLatest update June 6, 2008
Halekauwila Street monitor well (03-1851-19),OahuHalekauwila Street monitor well (site photo) is located at the corner of Richards and Halekauwila Streets in downtown Honolulu (similar to well B in drawing of southern Oahu ground-water system). The well was drilled in 1897 to a depth of about 1,050 ft from an altitude of about 6 ft. By 1949 the well had become too salty for use as a coolant at Hawaiian Electric and it was converted to a monitoring well (see newspaper clipping). The well now has two 0.5-in. sampling pipes open to the aquifer at altitudes of -988 and -1,043 ft (see well-construction details). Since 1973, the U.S. Geological Survey has collected water samples to measure the specific conductance of the water, a measure of salinity near the top of the Koolau Basalt. In 1998, the deepest pipe (A) occasionally stopped flowing as the head in the aquifer dropped below the ground surface due to a combination of ground-water withdrawal and increased salinity of the water. This station is currently operated by Leigh Marcello of the Honolulu field office. Link to NWISWeb data for this well: Pipe A, Pipe B Historical water-quality record Well-construction details
(source of well-construction data: US Geological Survey, Pacific Islands Water Science Center files)
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