USGS Water-Year Summary for Site 01656903

Click to hide Water-Year Summary instructions and information

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.

	Available Parameters
	00010 Temperature, water(Max.,Min.,Mean,Med.)
	00060 Discharge(Mean)
	00095 Specific cond at 25C(Max.,Min.,Mean,Med.)
	00300 Dissolved oxygen(Max.,Min.,Mean,Med.)
	00400 pH(Max.,Min.,Med.)
	63680 Turbidity, Form Neph(Med.,Mean,Min.,Max.)

Select a water year

Water year 2023: 2022-10-01 to 2023-09-30

Print this page

USGS Water-Year Summary 2023

01656903 FLATLICK BRANCH ABOVE FROG BRANCH AT CHANTILLY, VA

LOCATION - Lat 38°52'56.2", long 77°25'55.9" referenced to North American Datum of 1927, Fairfax County, VA, Hydrologic Unit 02070010, on right bank 0.9 mi downstream from State Highway 50, 100 ft upstream from Frog Branch, and 0.6 mi south of Chantilly.

DRAINAGE AREA - 4.20 mi².

SURFACE-WATER RECORDS

PERIOD OF RECORD - September 2007 to current year.

GAGE - Water-stage recorder. Datum of gage is 254.92 ft NAVD of 1988.

WATER-QUALITY RECORDS

PERIOD OF RECORD - October 2007 to current year.

PERIOD OF DAILY RECORD -
DISSOLVED OXYGEN: March 2012 to current year.
pH: October 2007 to current year.
SPECIFIC CONDUCTANCE: October 2007 to current year.
TURBIDITY: October 2007 to current year.
WATER TEMPERATURE: October 2007 to current year.

INSTRUMENTATION - Water-quality monitor. Electronic data logger with 15-minute recording interval.

EXTREMES FOR PERIOD OF DAILY RECORD -
DISSOLVED OXYGEN: Maximum: 16.9 mg/L, Apr. 13, 2015, but may have been higher during periods of missing record; minimum: 4.0 mg/L, Aug. 21, 2015 and Sept. 11, 2015, but may have been lower during periods of missing record.
pH: Maximum: 9.0 standard units, Apr. 4, 2015, but may have been higher during periods of missing record; minimum: 6.5 standard units, July 8, 2015, but may have been lower during periods of missing record.
SPECIFIC CONDUCTANCE: Maximum: 5490 microsiemens/cm, Feb. 22, 2015, but may have been higher during periods of missing record; minimum: 54 microsiemens/cm, July 8, 2015, but may have been lower during periods of missing record.
TURBIDITY:- Maximum: 580 FNU, May 18 2015, but may have been higher during periods of missing record; minimum: 0.0 FNU, on many days.
WATER TEMPERATURE: Maximum: 27.2 °C, July 30, 2015, but may have been higher during periods of missing record; minimum: -0.1 °C, Feb. 22, 24, 25, 2015, but may have been lower during periods of missing record.