USGS Water-Year Summary 2021
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.
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. Elevation of gage is 590 ft above NAVD of 1988, from digital elevation models.
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.
PERIOD OF RECORD - SEDIMENT DATA: Water years 2016 to current year.