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Hawaii Water Quality Extension Program
nps 319 | oahu watersheds | koolaupoko | project 02-225
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Natural Resources Extension

Project Name: Waimanalo Stream Restoration and Total Maximum Daily Load
ASO Log No.: 02-225
Start/End Date: June 2002 to June 2004
Federal Funds: $120,000.00
Matching Funds: $120,000.00
Contractor: Lisa Ferentinos
University of Hawaii, Center for Conservation, Research and Training
Pacific Biomeducal Research Center, Gilmore 409
Honolulu, HI 96822
Phone: (808) 259-2613
Fax: (808) 259-2603
The middle sections of both Kahawai and Waimanalo Streams are exceeding nitrate and sediment TMDLs by the greatest amount. Nitrate is the biggest problem in the middle portion of Kahawai Stream where actual loads are up to 28 times the allowable load. Nitrate appears to becoming from shallow groundwater seeps into the stream. Trail, driveway, and roadside erosion bring sediment to the confluence of two tributaries of Waimanalo stream at the intersection of Kumuhau and Waikupanaha Streets. The biggest problem with phosphorous is in the upper Waimanalo stream subwatershed where actual total dissolved phosphorous was 214 times the allowable load during one measured storm.
Objectives/Goals: The project will improve water quality problems in the Waimanalo Stream and the Koolaupoko Watershed by implementing specific measures identified in the Waimanalo Stream Total Maximum Daily Load Implementation Plan. The project has hired project staff and is contacting stakeholders in the Waimanalo Watershed to be a part of the project’s advisory group. A monitoring plan is being developed and initiation of stream bank restorations should being early next year.
Methods Employed: • Provide technical assistance for nutrient management planning to Waimanalo farms and nurseries
• Demonstrate the use of permeable, modular blocks with revegetation for stream bank stabilization and toe protection
• Demonstrate the use of drought tolerant, low maintenance vegetation on eroding roadsides
• Provide educational program on small scale animal waste management
• Provide community education in water quality through educational materials
• Provide assistance to the Hui Malama o ke Kai after school program
• Implement an anti-dumping and clean-up campaign
• Install a well-designed stream crossing for the equestrian trail
Pollutants of Concern: Sediment, nitrate
Watershed: Koolaupoko Watershed, island of Oahu
Size of Project: Not described in report
Affected Water Bodies: Kahawai and Waimanalo Streams
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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.