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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.
- Not all sites have reports available for every water year.
USGS Water-Year Summary 2024
11048175 Agua Chinon Wash at Portola Springs Road near Irvine, CA
LOCATION - Lat 33°41'13.5", long 117°41'43.5" referenced to North American Datum of 1983, Orange County, CA, Hydrologic Unit 18070204, in Lomas de Santiago Grant, on right bank, 0.15 mi south of Portola Springs Road, and 5.8 mi east of Irvine.
DRAINAGE AREA - 2.10 mi².
SURFACE-WATER RECORDS
PERIOD OF RECORD - December 2, 2015 to current year. 2016 to 2019 published under 11048200 Agua Chinon Wash nr Irvine, during relocation.
GAGE - Water-stage recorder and concrete control. Datum of gage is 571.57 ft above NAVD of 1988.
REMARKS - No diversion upstream from station. Irrigation return flow can cause low-flow fluctuations in discharge at times.
EXTREMES FOR PERIOD OF RECORD - Maximum discharge, 76.7 ft³/s, Jan. 12, 2017, gage height, 2.14 ft; maximum gage height, 11.39 ft, Dec. 6, 2018, at different site and (or) datum, no flow for many days in most years.
WATER-QUALITY RECORDS
PERIOD OF RECORD - SEDIMENT DATA: Water years 2016 to current year.
REMARKS - No sediment samples collected in 2018 water year.
