Project Name: |
Nonpoint Source Pollution within the Anahulu River
and Opaeula Stream Drainage Areas, Kaiaka - Waialua Bay HUA |
Start/End Date: |
June 1991 to September 1993 |
Contractor: |
Gordon Dugan
University of Hawaii at Manoa
Water Resources Research Center
2540 Dole St., Holmes Hall 283
Honolulu, HI 96822
Phone: (808) 965-8969 |
Background/
Overview: |
Kaiaka and Waialua bays, located on the north shore of the island
of Oahu, have long-term histories of turbid water conditions occurring
after significant rainfall events. Both bays are popular sites
for recreational activities but experience turbid conditions for
several days to several weeks after a heavy storm. The bays are
receptacles of the approximately 70,700 acre Kaiaka - Waialua Hydrologic
Unit Area (HUA), with Kaiaka Bay receiving runoff from four distinct
drainage areas and Waialua Bay from one drainage area. |
Objectives/Goals: |
To monitor the quality and quantity of sediment, nutrients, and
organics being washed from the Kaiaka - Waialua HUA and subsequently
contributing to nonpoint source pollution in Kaiaka and Waialua
bays. (Baseline collection of water quality data as part of larger
project implementing best management practices within the watershed.) |
Methods Employed: |
Four sampling sites at Anahulu River, which flows to Waialua
Bay, and Opae’ula Stream, which drains to Kaiaka Bay, were
selected for water quality sampling. Grab samples were collected
mostly during dry weather runoff conditions for one year, and
storm runoff samples were collected with automatic sampling devices
over a 5 month period during the “wet season”.
|
Pollutants of Concern: |
Sediment, Nutrients, Organics |
Watershed: |
Waialua, Kiikii, Poamoho, Kaukonahua, Paukaulia,
Opaeula, Helemano, Anahulu, Kawailoa, Kawaiiki, Loko Ea and Keamanea
Watersheds, island of Oahu |
Deliverables: |
Water quality results for the project duration
in final report |