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Water-Year Summary for Site 16725000

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Available Parameters
00060 Discharge(Mean)  

Water year 2023: 2022-10-01 to 2023-09-30
 
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USGS Water-Year Summary 2023
16725000 Alakahi Stream near Kamuela, HI
LOCATION - Lat 20°04'15.9", long 155°40'14.7" referenced to North American Datum of 1983, Hawaii County, HI, Hydrologic Unit 20010000, on right bank 25 ft upstream from Upper Hamakua ditch intake, and 3.5 mi north of Kamuela.
DRAINAGE AREA - 0.83 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-94-1: 1964-90. WDR HI-10-1: Drainage Area. WDR HI-11-1: 2004-2010 (P).  January 21 to March 7, 2018: Discharge unit values were revised on Aug. 9, 2018.  March 2, 2020 to March 10, 2020: Discharge unit values were revised on September 29, 2020. 
SURFACE-WATER RECORDS
PERIOD OF RECORD - January 1964 to current year.
GAGE - Water-stage recorders. Elevation of gage is 3,900 ft above mean sea level (from topographic map).
REMARKS - Pipeline no longer diverts from tributary 0.4 mi upstream.
EXTREMES FOR PERIOD OF RECORD - Maximum discharge, 1,430 ft³/s, January 11, 1967, gage height 8.65 ft, from rating curve extended above 28 ft³/s on basis of computations of peak flow over dam and slope-area measurement at gage height 8.65 ft; maximum gage height, 12.80 ft, November 18, 1979; minimum, no flow February 7-11, 2010, September 9-13, 2015, November 2-6, 2015, March 7, 8, 31, 2016, and April 1, 2016.