College of Tropical Agriculture and Human Resources
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Hawaii Water Quality Extension Program
nps 319 | oahu watersheds | waialua | project 04-198
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Natural Resources Extension

Project Name: Controlling Water Contamination at the Source by Integrated Technologies, Kaiaka-Waialua Watersheds
ASO Log No.: 04-198
Start/End Date: October 2003 to April 2006
Federal Funds: $153,800.00
Matching Funds: $154,200.00
Contractor: Dr. Ali Fares
College of Tropical Agriculture and Human Resources
Department of Natural Resources and Environmental Mngmnt
1910 East-West Road, Sherman Lab Room 101
Honolulu, HI 96822
Phone: (808) 956-8708
Fax: (808) 956-6539
Kaiaka Bay and Waialua Bay, two adjacent water bodies on the North Shore of Oahu, have been classified by the Department of Health as water quality limited segments. Sediment loads from agricultural lands and effluent discharged from household cesspools are two of the major sources of pollution
Objectives/Goals: To demonstrate and implement erosion control practices as an efficient tool to help manage erosion throughout Kaiaka-Waialua watershed. To reduce sediment and pollutant loads (phosphorous and nitrogen) into the surface and ground water sources, thereby improving water quality of the coastal area. To demonstrate the quantification of the improvement of water quality of the surface and subsurface soil waters.
Methods Employed:

• Plant two cover crops and compost to reduce surface erosion and water quality degradation
• Monitor erosion rates, sediment loads in surface water, weather, runoff rates and soil water content, soil water quality, surface runoff water quality, N and P levels, and rainfall.
• Train high school students on installing and maintaining scientific equipment, experimental site maintenance, data collection and analysis, soil sampling procedures, surface, subsurface water measurements, presenting results in science fairs, participating in workshops.

Pollutants of Concern: Phosphorous, nitrate, nitrite nitrogen, chlorophyll a exceeding maximum allowable levels, turbidity
Watershed: Waialua, Kiikii, Poamoho, Kaukonahua, Paukaulia, Opaeula, Helemano, Anahulu, Kawailoa, Kawaiiki, Loko Ea and Keamanea Watersheds, island of Oahu
Size of Project: 1 acre sampling site
Affected Water Bodies: Kaiaka and Waialua Bays
Deliverables: • Fact sheets
• Journal articles
• Web site with project information
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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.