College of Tropical Agriculture and Human Resources
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Hawaii Water Quality Extension Program
nps 319 | oahu watersheds | pearl harbor | project 93-095
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Natural Resources Extension

Project Name: Contaminant Control by Cover and Residue Management on Agricultural Land in the Pearl Harbor Basin
ASO Log No.: 93-095
Start/End Date: November 1992 to June 1996
Federal Funds: 90,000.00
Matching Funds: 36,000.00
Contractor: Samir El-Swaify
University of Hawaii – CTAHR
Department of Agronomy and Soil Sciences
1910 East-West Road, Sherman Lab
Honolulu, HI 96822
Phone: (808) 956-8825
In 1990 the Department of Health identified Pearl Harbor as a Water Quality Limited Segment requiring remedial action. Both surface and groundwater in the region are vulnerable to nonpoint source pollution (NPSP) from agricultural lands; the first is from runoff and erosional sediments and the second from leaching of mobile agrichemicals beyond the crop’s root zone.
Objectives/Goals: To establish demonstration locations on agricultural lands in the basin in order to define and evaluate biological control and cultural practices capable of controlling erosion and subsequent NPSP into the estuary.
Methods Employed: • Demonstrate alternative technologies involving the use of live ground cover and crop residues
• Monitor and quantify the benefits of the demonstrated technologies
• Accelerate the transfer and adoption of recommended technologies by land users and agency clientele
• Design a user-friendly, computer-based decision aid to recommend optimum management practices for NPSP control
Pollutants of Concern: Turbidity, chemical, and biological contaminants
Watershed: Pearl Harbor Waterbody Segment consisting of 10 subwatersheds: Manuwai, Halawa, Aiea, Kalauao, Waimalu, Waiawa, Waipio, Kapakahi, Waikele, Honouliuli, and Kaloi, island of Oahu
Size of Project: Demonstration sites in crop fields
Affected Water Bodies: Not described in report
Deliverables: • “Water Quality Expert System (WATER QUEST)” computer-based decision aid
• photos of demonstration sites and techniques used
• newsletter
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Cooperative Extension Service programs, conducted in cooperation with the U. S. Department of Agriculture, are provided to the people of Hawaii without regard to race, sex, age, religion, color, national origin, ancestry, disability, marital status, arrest and court record, sexual orientation, or veteran status. The University is an equal opportunity / affirmative action institution.