USGS Water-Year Summary for Site 16210200

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	Available Parameters
	00060 Discharge(Mean)
	63680 Turbidity, Form Neph(Mean) [ANALITE]
	63680 Turbidity, Form Neph(Mean) [DTS-12]
	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

16210200 Kaukonahua Stream below Wahiawa Reservoir, Oahu, HI

LOCATION - Lat 21°30'00.9", long 158°03'03.9" referenced to North American Datum of 1983, Honolulu County, HI, Hydrologic Unit 20060000, on right bank 0.25 mi below Wahiawa Reservoir spillway, 1.5 miles west of Wahiawa Post Office, 2.5 miles west of Leilehua high School, and 1.3 miles northwest of Wheeler Middle School.

DRAINAGE AREA - 16.7 mi². from automated delineation using 10-meter National Elevation Dataset 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 -

Turbidity (DTS-12) data was revised from May 18, 2016 to March 29, 2017 on June 26, 2018.

Discharge data was revised from June 19, 2018 to January 30, 2019 on June 3, 2019.

Sediment concentrations and loads were revised from August 10, 2020 to September 30, 2020 on March 24, 2022.

SURFACE-WATER RECORDS

PERIOD OF RECORD - October 2012 to current year.

GAGE - Water-stage recorder. Elevation of gage is 770 feet above mean sea level (from topographic map).

REMARKS - Streamflow is regulated by Wahiawa Reservior and Wahiawa Ditch-water release.

EXTREMES FOR PERIOD OF RECORD - Maximum discharge, 1,530 ft³/s, March 9, 2021, gage height 11.87 ft; maximum gage height, 12.07 ft, January 12, 2020; minimum daily discharge, no flow, on many days.

WATER-QUALITY RECORDS

PERIOD OF RECORD - Suspended sediment concentration and discharge October 2012 to September 2021. Turbidity September 2014 to September 2021. Miscellaneous water quality measurements August 2017 to September 2021.

PERIOD OF DAILY RECORD - SUSPENDED-SEDIMENT DISCHARGE: October 2012 to September 2021. TURBIDITY: September 2014 to September 2021.

INSTRUMENTATION - Automatic pumping sediment sampler October 2012 to September 2021. Turbidity sensor September 2014 to September 2021. Automatic water-quality monitor August 2017 to September 2021.

EXTREMES FOR PERIOD OF DAILY RECORD - SUSPENDED-SEDIMENT CONCENTRATION: Maximum daily mean, 177 mg/L, July 21, 2014; minimum, 3 mg/L, November 13, 14, and 15. SUSPENDED-SEDIMENT DISCHARGE: Maximum daily, 80 tons, July 21, 2014; minimum, 0.00 tons on many days. TURBIDITY: Maximum recorded, 1830 FNU, November 23, 2015; minimum recorded, 0.0 FNU, on many days.