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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.
- For water years 2006 through 2013, choose a water year and an Annual Water Data Report will be provided.
- For water years 2005 and earlier, Annual Water Data Reports may be available in digital format.
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USGS Water-Year Summary 2023
16522950 Piinaau Str 470 ft US Koolau Ditch, Maui, HI
LOCATION - Lat 20°49'37.91", long 156°10'30.37" referenced to North American Datum of 1983, Maui County, HI, Hydrologic Unit 20020000, 3.3 miles south of the Piinaau Road entrance, 3.8 miles southwest of the Halfway to Hana sign, 9.5 miles southeast of the Garden of Eden Arboretum.
DRAINAGE AREA - 14.8 mi². delineated in StreamStats 6/11/2018.
| Basin Characteristic | Value | Unit |
| Mean basin elevation | 5640 | feet |
| Minimum basin elevation | 1010 | feet |
| Maximum basin elevation | 10000 | feet |
| Length of longest flow path | 12.4 | miles |
| Relief (max elevation - min elevation) | 8990 | feet |
| Relative relief (relief divided by perimeter) | 301.7 | feet per mi |
| Mean annual precipitation | 135 | inches |
SURFACE-WATER RECORDS
PERIOD OF RECORD - June 2018 to current year.
GAGE - Water-stage recorder and concrete control. Elevation of gage is 1,350 feet above mean sea level (from USGS National Map, August 2019).
REMARKS - No diversion upstream. Ditch intake 250 ft downstream of control. This is a continuous low-flow station with a maximum reporting limit of 3.09 ft³/s.
EXTREMES FOR PERIOD OF RECORD - Minimum daily discharge, 0.00 ft³/s, on many days; Maximum daily not computed.
