USGS Water-Year Summary for Site 16247100

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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

16247100 Manoa-Palolo Drainage Canal at Moiliili, Oahu, HI

LOCATION - Lat 21°17'11.5", long 157°49'06.8" referenced to North American Datum of 1983, Honolulu County, HI, Hydrologic Unit 20060000, on left bank at Kaimuki High School, and 0.3 miles downstream from confluence of Manoa and Palolo Streams, and 0.6 miles upstream from point of discharge into Ala Wai Canal.

DRAINAGE AREA - 10.2 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 - WDR HI-07-1; 2005(P). Various instantaneous gage height and discharges revised from October 7, 2018 to February 26, 2019 on August 19, 2019. Sediment data was revised for February 18, April 13-14, and September 12-13, 2018 on May 7, 2020. Instantaneous peak gage height and discharges were revised for August 15, October 15, 2019, and January 16, 2020 on September 23, 2020. Instantaneous discharge data was revised from September 12, 2019 to June 24, 2020 on February 8, 2021 and from June 25 to October 16, 2020 on June 24, 2021.

SURFACE-WATER RECORDS

PERIOD OF RECORD - Annual maximum, water years 1968-99. October 1999 to current year.

GAGE - Water-stage recorder. Elevation of gage is 5 feet above mean sea level (from topographic map). October 1, 1967 to November 29, 1972 crest-stage gage at site 1,800 feet upstream at same datum. November 29, 1972 to current year crest-stage gage at site 160 feet upstream at same datum.

REMARKS - Records are adjusted for tidal influence.

EXTREMES FOR PERIOD OF RECORD - Maximum discharge, 10,100 ft³/s, December 18, 1967, gage height, 12.60 feet, site then in use, from slope-area measurement of peak flow; minimum daily discharge, e1.6 ft³/s, August 16-17, 2003.

WATER-QUALITY RECORDS

PERIOD OF RECORD - SUSPENDED SEDIMENT: March 2010 to current year. TURBIDITY, water, unfiltered, monochrome near infa-red LED light, 780-900 nm, detection angle 90 +/- 2.5 degrees, August 2015 to November 2017, September 2019 to current year.

PERIOD OF DAILY RECORD - SUSPENDED SEDIMENT DISCHARGE: October 2010 to current year. TURBIDITY, water, unfiltered, monochrome near infa-red LED light, 780-900 nm, detection angle 90 +/- 2.5 degrees: August 2015 to November 2017, and September 2019 to current year.

INSTRUMENTATION - Automatic pumping sediment sampler March 2010 to current year. to current year. Turbidity sensor August 2015 to November 2017, September 2019 to current year.

EXTREMES FOR PERIOD OF RECORD - SUSPENDED-SEDIMENT CONCENTRATION: maximum daily mean, 526 mg/L, July 20, 2014; minimum daily, 2 mg/L, on many days. SUSPENDED-SEDIMENT DISCHARGE: maximum daily, 2,650 tons, July 20, 2014; minimum daily, 0.02 tons, on many days. TURBIDITY, water, unfiltered, monochrome near infa-red LED light, 780-900 nm, detection angle 90 +/- 2.5 degrees: Maximum recorded, 4,380 formazin nephelometric units (FNU), January 1, 2022, but may have been higher during periods of missing record; minimum, 0.0 FNU on many days.