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Water-Year Summary for Site 16210200

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  • Water-Year Summary reports summarize a year of hydrologic data in a printer-friendly format.
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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)  

Water year 2020: 2019-10-01 to 2020-09-30
 

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USGS Water-Year Summary 2020
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.

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, 1,480 ft³/s, January 12, 2020, gage height, 12.07 ft; minimum daily discharge, no flow, on several days.
WATER-QUALITY RECORDS
PERIOD OF RECORD - Suspended sediment concentration and discharge October 2012 to current year. Turbidity September 2014 to current year.   Miscellaneous water quality measurements August 2017 to current year.
PERIOD OF DAILY RECORD - SUSPENDED-SEDIMENT DISCHARGE: October 2012 to current year. TURBIDITY: September 2014 to current year.
INSTRUMENTATION - Automatic pumping sediment sampler October 2012 to current year. Turbidity sensor September 2014 to current year. Automatic water-quality monitor August 2017 to current year.   
EXTREMES FOR PERIOD OF DAILY RECORD - SUSPENDED-SEDIMENT CONCENTRATION: Maximum daily mean, 177 mg/L, July 21, 2014; minimum, 4 mg/L on many days. 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, multiple days.