USGS Water-Year Summary 2023

02336030 NORTH FORK PEACHTREE CREEK AT GRAVES ROAD, NEAR DORAVILLE, GA

LOCATION - Lat 33°54'21", long 84°13'30" referenced to North American Datum of 1983, Gwinnett County, GA, Hydrologic Unit 03130001, at bridge at Graves Road, 0.3 miles east of Interstate 85.

DRAINAGE AREA - 1.53 mi². revised.

REVISIONS HISTORY - WDR GA-2013: Drainage area.

SURFACE-WATER RECORDS

PERIOD OF RECORD - DISCHARGE: June 2001 to current year. GAGE-HEIGHT: June 2001 to current year.

GAGE - Satellite telemetry with a water-stage recorder and a continuous water-quality monitor. Datum of gage is 928.55 feet above NAVD88. Prior to December 2006, gage located 75 feet downstream at same datum.

COOPERATION - Gwinnett County Department of Water Resources.

REMARKS - Gage-height records are generally fair. Discharge records are generally poor. Additional details on the accuracy of the records can be obtained by contacting the USGS South Atlantic Water Science Center at gs-w-ga_nwisweb_data_inquiries@usgs.gov.

EXTREMES FOR PERIOD OF RECORD - Maximum discharge, 2,840 cfs, on basis of slope-area measurement of peak flow; September 21, 2009; maximum gage-height recorded 12.93 feet, September 21, 2009; minimum daily discharge, 0.05 cfs, estimated, August 23 and September 7, 2008.

CLIMATOLOGICAL RECORDS

PERIOD OF RECORD - June 2001 to September 2007. November 2008 to current year.

INSTRUMENTATION - Tipping-bucket raingage.

WATER-QUALITY RECORDS

PERIOD OF RECORD - August 1976, June 2001 to current year.

PERIOD OF DAILY RECORD -
SPECIFIC CONDUCTANCE: June 2001 to current year.
WATER TEMPERATURE: June 2001 to current year.
TURBIDITY: June 2001 to current year.

INSTRUMENTATION - Satellite telemetry with a continuous water-quality monitor and an refrigerated automatic sampler.

REMARKS -
For period 10/01/2014-09/30/2015: Specific conductance and water temperature records are rated good, Turbidity records are rated fair.
For period 10/01/2015-09/30/2016: Specific conductance and water temperature records are rated good, Turbidity records are rated poor.
For period 10/01/2016-09/30/2017: Specific conductance and water temperature records are rated good, Turbidity records are rated poor.
For period 10/01/2017-09/30/2018: Specific conductance and water temperature records are rated good, Turbidity records are rated poor.
For period 10/01/2018-09/30/2019: Specific conductance and water temperature records are rated good, Turbidity records are rated poor.

Data for parameter code 63680 (turbidity) were collected using a probe with the following specifications: turbidity, water, monochrome near infra-red LED light, 780-900 nm, detection angle 90 +/-2.5 degrees, FNU (Formazin Nephelometric Units). Prior to October 1, 2004, turbidity data were published using parameter code 00076: turbidity, water, unfiltered, NTU(Nephelometric Turbidity Units). Hydrologic event code of 9 indicates a routine sample while J designates a storm event sample. Laboratory chemical analyses are by RTI Laboratories, Livonia, MI. Laboratory sediment analyses are by the U.S. Geological Survey, Kentucky Sediment Laboratory. Field determinations of discharge, gage height, specific conductance, pH, water temperature, air temperature, turbidity, barometric pressure and dissolved oxygen are by the U.S. Geological Survey.

EXTREMES FOR PERIOD OF RECORD -

SPECIFIC CONDUCTANCE: Maximum recorded, 1,590 microsiemens, January 6, 2017; minimum recorded, 5 microsiemens, July 12, 2019.

WATER TEMPERATURE: Maximum recorded, 30.8°C, August 5, 2008; minimum recorded, 1.2°C, January 24, 2003.

TURBIDITY: Maximum recorded, >2,200 FNU on several days; minimum recorded, < 0.5 FNU, June 18,19 and 22, 2020.