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- Water-Year Summary reports summarize a year of hydrologic data in a printer-friendly format.
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USGS Water-Year Summary 2024
16226200 North Halawa Stream near Honolulu, Oahu, HI
LOCATION - Lat 21°22'55.2", long 157°54'12.0" referenced to North American Datum of 1983, Honolulu County, HI, Hydrologic Unit 20060000, on right bank, 0.6 mi north of Oahu Prison, 1.0 mi south of Keaiwa Heiau, and 1.7 mi east of Aiea High School.
DRAINAGE AREA - 4.02 mi². from automated delineation using 10-meter National Elevation Data set digital elevation model data dated September 2006 and Watershed Boundary Dataset dated May 2008, using UTM Zone 4 projection, NAD 83 horizontal datum.
REVISIONS HISTORY - WDR HI-05-1: 2004(M). WDR HI-10-1: Drainage Area. WDR HI-14-01: (M). Suspended sediment concentrations were revised for October 4, 2014, October 30-31, 2014, and May 18, 2019 and suspended sediment discharge for October 4, 2015 on September 25, 2020.
SURFACE-WATER RECORDS
PERIOD OF RECORD - February 1983 to current year.
GAGE - Water-stage recorder. Elevation of gage is 160 ft above mean sea level (from topographic map).
REMARKS - No diversions upstream.
EXTREMES FOR PERIOD OF RECORD - Maximum discharge, 2,390 ft³/s, December 13, 2011, gage height, 12.63 ft; no flow at times each year.
WATER-QUALITY RECORDS
PERIOD OF RECORD - Miscellaneous water quality samples 1983-2009. Turbidity November 2005 to September 2008, June 2020 to current year. Suspended sediment concentration and discharge 1983-1999, 2006 to current year.
INSTRUMENTATION - Automatic pumping sediment sampler 1983-1999, 2006 to current year. Turbidity sensor November 2005 to September 2008, June 2020 to current year.
EXTREMES FOR PERIOD OF RECORD - SUSPENDED SEDIMENT CONCENTRATION: maximum daily mean, 5,360 mg/L (estimated), November 14, 1996; minimum, 0 mg/L on many days. SUSPENDED SEDIMENT DISCHARGE: maximum daily, 5,310 tons, March 24, 1994; 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, 2,900 formazin nephelometric units (FNU), December 6, 2021; minimum, 0.0 FNU on many days.
