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Hawaii Water Quality Extension Program
nps 319 | oahu watersheds | waialua | project 95-002
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Natural Resources Extension

Project Name: Erosion Control Studies for Agricultural Roads in the Kaiaka - Waialua HUA
ASO Log No.: 95-002
Start/End Date: September 1994 to September 1995
Federal Funds: $36,580.00
Matching Funds: $24,460.00
Contractor: Peter Gibson
West Oahu Soil and Water Conservation District
1001 Kamokila Blvd.
Kapolei, HI 96707
Phone: (808) 674-3279
Fax (808) 861-8519
Kaiaka – Waialua Bay is listed as a DOH Water Quality Limited Segment due to nonpoint source pollution. State monitoring showed that turbidity and total phosphorous levels in the bay exceeded State Water Quality Standards. Kaiaka – Waialua Bay is approximately 1200 acres in size, and receives drainage from 70,700 acrea Kaiaka – Waialua Hydrologic Unit Area.
Objectives/Goals: Demonstrate and compare the application of various protective covers to reduce erosion on bare soil agricultural roads; observe the effectiveness of various cover types in suppressing weeds on agricultural roads; and assess the potential for lowering agricultural road maintenance costs by reducing erosion damage and the need to apply herbicides for weed control.
Methods Employed:

3 road sites with normal frequency use were selected. 12 road cover treatment options were identified as demonstration treatments using bare control, pineapple trash, sugarcane bagasse, compost, cover mulch, kikuyu or annual rye grass, crushed asphalt

Pollutants of Concern: Turbidity and phosphorous
Watershed: Waialua, Kiikii, Poamoho, Kaukonahua, Paukaulia, Opaeula, Helemano, Anahulu, Kawailoa, Kawaiiki, Loko Ea and Keamanea Watersheds, island of Oahu
Size of Project: 1200 feet
Affected Water Bodies: None mentioned in report
Deliverables: Brochure of project procedures and results
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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.