USGS Water-Year Summary for Site 16200000

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	Available Parameters
	00060 Discharge(Mean)
	63680 Turbidity, Form Neph(Mean)
	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

16200000 North Fork Kaukonahua Stream above Right Branch, near Wahiawa, Oahu, HI

LOCATION - Lat 21°30'58.6", long 157°56'43.1" referenced to North American Datum of 1983, Honolulu County, HI, Hydrologic Unit 20060000, on left bank 140 feet upstream from mauka ditch intake and Right Branch, and 4.5 miles northeast of Wahiawa.

DRAINAGE AREA - 1.38 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 - WSP 1219: 1931-33(M), 1935(M), 1937-38(M). WSP 1319: 1914, 1917-18(M), 1920-23(M), 1925(M), 1927-30(M). WSP 1719: Drainage Area. WDR HI-04-1: 1939-43(P), 1945-53(P), 1961-2002(P).

SURFACE-WATER RECORDS

PERIOD OF RECORD - May 1913 to July 1953, April 1960 to current year. Monthly discharge only for some periods, published in WSP 1319. Prior to August 1953, published as Left Branch of North Fork Kaukonahua Stream near Wahiawa.

GAGE - Water-stage recorder and concrete control. Elevation of gage is 1,150 feet above mean sea level (from topographic map).

REMARKS - No diversions upstream.

EXTREMES FOR PERIOD OF RECORD - Maximum discharge, 6,480 ft³/s, March 9, 2021, gage height, 14.29 ft; minimum, 0.07 ft³/s, November 3, 2020.

WATER-QUALITY RECORDS

PERIOD OF RECORD - Miscellaneous water quality measurements 1968-1986, 2001, October 2017 to April 2019. Suspended sediment loads and concentrations October 2012 to current year; Turbidity April 2013 to September 30, 2021.

PERIOD OF DAILY RECORD - Suspended sediment concentrations and discharge: October 2012 to current year. Turbidity: April 2013 to September 2021.

INSTRUMENTATION - Automatic pumping sediment sampler October 2012 to current year. Turbidity sensor April 2013 to current year.

EXTREMES FOR PERIOD OF RECORD - SUSPENDED-SEDIMENT CONCENTRATION: maximum, 2,820 mg/L, November 8, 2013; minimum, 1 mg/L on many days. TURBIDITY: maximum recorded, 2,240 FNU, September 15, 2019; minimum recorded, 0.0 FNU on many days.

EXTREMES FOR PERIOD OF DAILY RECORD - SUSPENDED-SEDIMENT CONCENTRATION: maximum daily mean, 242 mg/L, July 20, 2014; minimum, 1 mg/L on many days. SUSPENDED-SEDIMENT DISCHARGE: maximum daily, 1,130 tons, July 20, 2014; minimum, 0 tons on many days. TURBIDITY: maximum daily, 97.4 FNU, September 15, 2019; minimum, 0.2 FNU on August 14, 2019.