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- Water-Year Summary reports summarize a year of hydrologic data in a printer-friendly format.
- For water years 2014 onward, choose a water year and parameter and an on-demand Water-Year Summary report will be generated.
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USGS Water-Year Summary 2024
16249000 Waimanalo Stream at Waimanalo, Oahu, HI
LOCATION - Lat 21°20'59.9", long 157°43'44.1" referenced to North American Datum of 1983, Honolulu County, HI, Hydrologic Unit 20060000, on right bank 260 feet downstream from Kalanianaole Highway (Highway 72), 0.9 miles southwest of Bellows Air Force Base Radar Towers, and 2.3 miles northwest of Waimanalo Post Office.
DRAINAGE AREA - 2.13 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-03-1: 1994(P). WDR HI-09: 2008(P). WDR HI-10-1: Drainage Area. Gage height and discharge for the period April 15 to August 22, 2020 were revised on November 9, 2021.
SURFACE-WATER RECORDS
PERIOD OF RECORD - 1971-2015 (annual maximum). 1967-1970, October 2015 to current.
GAGE - Water-stage recorder. Elevation of gage is 20 feet above mean sea level (from topographic map).
EXTREMES FOR PERIOD OF RECORD - Maximum discharge, 4,560 ft³/s on March 6, 1963 and November 26, 1970. Maximum gage height, 13.13 ft. on April 12, 2018.
WATER-QUALITY RECORDS
PERIOD OF RECORD - Suspended sediment discharge and concentrations: October 2015 to current year. Turbidity September 2019 to current year.
PERIOD OF DAILY RECORD - Suspended sediment concentrations and discharge October 2015 to current year. Turbidity September 2019 to current year.
INSTRUMENTATION - Automatic pumping sediment sampler October 2015 to current year. Turbidity sensor September 2019 to current year.
EXTREMES FOR PERIOD OF RECORD - SUSPENDED-SEDIMENT CONCENTRATION: maximum daily mean, 1,510 mg/L, April 13, 2018; minimum daily mean, 4 mg/L, January 3 and 4, 2017. SUSPENDED-SEDIMENT DISCHARGE: maximum daily, 2,680 tons, April 13, 2018; minimum daily, 0.02 tons, on many days. TURBIDITY: maximum, 5,960 FNU, March 15, 2020; minimum, 0.0 FNU on many days.
