Storm runoff water-quality samples were collected as part of the State of Hawaii Department of Transportation Stormwater Monitoring Program. This program is designed to assess the effects of highway runoff and urban runoff on Halawa Stream. For this program, rainfall data were collected at two stations, continuous discharge data at one station, continuous streamflow data at two stations, and water-quality data at five stations, which include the continuous discharge and streamflow stations. This report summarizes rainfall, discharge, streamflow, and water-quality data collected between July 1, 2005 and June 30, 2006.
A total of 23 samples was collected over five storms during July 1, 2005 to June 30, 2006. The goal was to collect grab samples nearly simultaneously at all five stations, and flow-weighted time-composite samples at the three stations equipped with automatic samplers; however, all five storms were partially sampled owing to lack of flow at the time of sampling at some sites, or because some samples collected by the automatic sampler did not represent water from the storm.
Samples were analyzed for total suspended solids, total dissolved solids, nutrients, chemical oxygen demand, and selected trace metals (cadmium, chromium, copper, lead, nickel, and zinc). Additionally, grab samples were analyzed for oil and grease, total petroleum hydrocarbons, fecal coliform, and biological oxygen demand. Quality-assurance/quality-control samples were also collected during storms and during routine maintenance to verify analytical procedures and check the effectiveness of equipment-cleaning procedures.
Water-Quality Sampling Techniques
Determination of Discharge
Sample Processing, Analysis, and Quality Assurance/Quality Control
Rainfall and Streamflow Data
Stormwater Sampling: Conditions and Results
Third Quarter 2005 - July 1 to September 30, 2005
Storm of July 12, 2005
Fourth Quarter 2005 - October 1 to December 31, 2005
First Quarter 2006 - January 1 to March 31, 2006
Storm of January 22-23, 2006
Storm of February 19-20, 2006
Storm of February 28-March 2, 2006
Second Quarter 2006 - April 1 to June 30, 2006
Storm of May 5, 2006
Appendix A: Discharge-Reporting and Load-Calculation Methods
Appendix B: Physical Properties, Concentrations, and Loads for All Samples Collected from Halawa Stream Drainage Basin During the Period from July 1, 2005 to June 30, 2006, Oahu, Hawaii - Provided as an Excel file
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Presley, T.K., Ball, M.T.J., and Young, S.T.M., 2005, Rainfall, Streamflow, and Water-Quality Data During Stormwater Monitoring, Halawa Stream Drainage Basin, Oahu, Hawaii, July 1, 2005 to June 30, 2006: U.S. Geological Survey Open-File Report 2006-1223, 27 p.
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