The Oahu National Water-Quality Assessment:
Groundwater Special Study
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Map of Oahu showing location of special study wells and land use (Hawaii State Office of Planning Land Use Districts, 2000).
A Special Study (SPCG) was completed in the summer of 2001 to assess the age and quality of groundwater in the irrigation-return layer of central Oahu. The objective of this study was to supplement the Study-Unit Survey (SUS) by sampling 15 existing monitoring wells for young, newly recharged water from forested, agricultural, and urban areas of Oahu’s main drinking-water aquifer (see map below). Groundwater in the irrigation-return layer beneath the latter two land uses is known to contain higher concentrations of inorganic constituents than deep, older water. Many of the SUS municipal wells are solid-cased through the irrigation-return layer potentially biasing the SUS results low. Results of the SUS and SPCG were integrated to more fully characterize the effects of human activities on central Oahu groundwater and to provide better early detection of new compounds. Well characteristics, along with land-use and land-cover information were collected for each well.
Use links below to download available NAWQA data (Excel 2000 spreadsheet).
USGS's National Water Information System-Web Interface (NWISWeb) provides access to additional USGS surface-water, groundwater and water-quality data for Hawaii and the Pacific Islands.
For More Information
If you have questions and comments related to the Oahu NAWQA study, contact:
Stephen Anthony (firstname.lastname@example.org)
Oahu NAWQA Project Chief
U.S. Geological Survey
677 Ala Moana Blvd., Suite 415
Honolulu, HI 96813