USGS Water-Year Summary for Site 16226400

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	Available Parameters
	00060 Discharge(Mean)
	63680 Turbidity, Form Neph(Mean)
	80154 Suspnd sedmnt conc(Mean)
	80155 Suspnd sedmnt disch(Mean)

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Water year 2023: 2022-10-01 to 2023-09-30

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USGS Water-Year Summary 2023

16226400 North Halawa Stream near Quarantine Station at Halawa, Oahu, HI

LOCATION - Lat 21°22'18.8", long 157°54'45.8" referenced to North American Datum of 1983, Honolulu County, HI, Hydrologic Unit 20060000, on left bank, 0.9 mi west of Oahu Prison, 1.4 mi north of Salt Lake Elementary School, and 1.2 mi northeast of Radford High School.

DRAINAGE AREA - 4.60 mi². from automated delineation using 10-meter National Elevation Dataset digital elevation model data dated September 2006 and Watershed Boundary Data set dated May 2008, using UTM Zone 4 projection, NAD 83 horizontal datum.

REVISIONS HISTORY -

WDR-07-01: 2007 (Daily and monthly discharges, November 1, 2006 to June 6, 2007, November 4, 2007 to October 4, 2009), WDR-10-01: 2008-2009 (Discharge, Sediment loads and concentrations), WDR-12-1: Drainage Area. WDR-HI-10-1: 2008, 2009.

Discharge data for January 31, 2019 was revised on June 19, 2019.

Discharge data for January 9, 2019 was revised on August 24, 2020.

Sediment load and concentration data from October 1, 2016 to September 30, 2017 was revised on December 15, 2020.

Discharge data for November 22, 2019 was revised on January 22, 2021.

SURFACE-WATER RECORDS

PERIOD OF RECORD - October 2001 to December 2003, July 2005 to current year.

GAGE - Water-stage recorder. Elevation of gage is 60 ft above mean sea level (from topographic map).

EXTREMES FOR PERIOD OF RECORD - Maximum discharge, 3,110 ft³/s, July 24, 2016, gage height, 12.47 ft; no flow on many days.

WATER-QUALITY RECORDS

PERIOD OF RECORD - Water Quality 2001-2008; Turbidity, November 2005 to June 2008, June 2020 to current year; Suspended sediment concentrations and discharge, October 2005 to current year.

INSTRUMENTATION - Automatic water-quality sampler 2001 - 2003, 2005 - 2009. Turbidity sensor November 2005 to June 2008, June 2020 to current year. Automatic pumping sediment sampler October 2005 to current year.

EXTREMES FOR PERIOD OF RECORD - SUSPENDED SEDIMENT CONCENTRATION: maximum daily mean 1,470 mg/L (estimated), October 25, 2005; minimum 0 mg/L on many days. SUSPENDED SEDIMENT DISCHARGE: maximum daily, 3,140 tons, July 24, 2016; minimum, 0 tons on many days. TURBIDITY, water, unfiltered, monochrome near infa-red LED light, 780-900 nm, detection angle 90 +/- 2.5 degrees: Maximum recorded, 2,730 FNU, December 6, 2021, but may have been higher during periods of missing record; minimum. 0.0 FNU on many days.