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Water-Year Summary for Site 02203900

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Available Parameters
00010 Temperature, water(Max.,Min.,Mean)  
00045 Precipitation(Sum)  
00060 Discharge(Mean)  
00065 Gage height(Mean)  
00095 Specific cond at 25C(Max.,Min.,Mean)  
00300 Dissolved oxygen(Max.,Min.,Mean)  
00400 pH(Max.,Min.,Med.)  
63680 Turbidity, Form Neph(Max.,Med.,Min.)  

Water year 2023: 2022-10-01 to 2023-09-30
 
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USGS Water-Year Summary 2023
02203900 SOUTH RIVER AT FLAKES MILL ROAD NR ATLANTA, GA
LOCATION - Lat 33°39'56.8", long 84°13'26.4" referenced to North American Datum of 1983, Dekalb County, GA, Hydrologic Unit 03070103,
DRAINAGE AREA - 99 mi².
REVISIONS HISTORY -

Water temperature records for the period Feb. 12, 2019, to Mar. 15, 2019, were revised on Jul. 29, 2019, a data correction error was discovered and removed.

A datum correction of -0.04ft was found on March 28, 2022. Gage-height data is corrected for this from October 13, 2021 to March 28, 2022.

SURFACE-WATER RECORDS
PERIOD OF RECORD -
DISCHARGE: October 1951 to September 1979 (annual maximum discharge only), October 1979 to September 1983, August 1987 to September 1991, October 1997 to September 1998, and April 2012 to current year.
GAGE-HEIGHT: April 2012 to current year.
GAGE - Satellite telemetry with water-stage recorder. Datum of gage is 717.72 feet above the North American Vertical Datum (NAVD) of 1988.
COOPERATION - DeKalb County Department of Watershed Protection.
REMARKS - Gage-height records are generally good. Discharge records are generally fair except for estimated discharges, which are 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 recorded, 12,500 cfs, February 25, 1961; maximum gage-height, 21.30 feet, February 25, 1961; minimum daily discharge recorded, 9.6 cfs, September 28, 2012.
CLIMATOLOGICAL RECORDS
PERIOD OF RECORD - April 2012 to current year.
INSTRUMENTATION - Tipping-bucket raingage.
WATER-QUALITY RECORDS
PERIOD OF RECORD - April 2012 to current year.
PERIOD OF DAILY RECORD -
SPECIFIC CONDUCTANCE: April 2012 to September 2013.
PH: April 2012 to September 2013.
WATER TEMPERATURE: April 2012 to September 2013.
DISSOLVED OXYGEN: April 2012 to September 2013.
TURBIDITY: April 2012 to September 2013.
INSTRUMENTATION - Satellite telemetry with a continuous water-quality monitor and an automatic refrigerated sampler.
REMARKS -
For period 10/01/2013-09/30/2014: Water temperature records are rated good. Specific conductance records are good. pH records are good. Dissolved Oxygen records are fair. Turbidity records are fair.
For period 10/01/2014-09/30/2015: Water temperature records are rated good. Specific conductance records are good. pH records are good. Dissolved Oxygen records are fair. Turbidity records are fair.
For period 10/01/2015-09/30/2016: Water temperature records are rated good. Specific conductance records are good. pH records are good. Dissolved Oxygen records are fair. Turbidity records are fair.
For period 10/01/2016-09/30/2017: Water temperature records are rated good. Specific conductance records are good. pH records are good. Dissolved Oxygen records are fair. Turbidity records are fair.
For period 10/01/2017-09/30/2018: Water temperature records are rated good. Specific conductance records are good. pH records are good. Dissolved Oxygen records are fair. Turbidity records are fair.

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 9 indicates a routine sample while J designates a storm event sample. Laboratory chemical analyses are by RTI Laboratory, Livonia, MI. Laboratory sediment analyses are by the U.S. Geological Survey, KY Sediment Laboratory. Field determinations of discharge, specific conductance, pH, water temperature, turbidity, barometric pressure, air temperature, microbiology, and dissolved oxygen are by the U.S. Geological Survey.
EXTREMES FOR PERIOD OF RECORD -
SPECIFIC CONDUCTANCE: Maximum recorded, 487 microsiemens, January 23, 2018; minimum recorded, 19 microsiemens, February 4, 2022.

PH: Maximum recorded, 7.8 units, October 14, 2013; minimum recorded, 5.8 units, August 9, 2014.

WATER TEMPERATURE: Maximum recorded, 31.9°C, July 1, 2012; minimum recorded, -0.3°C, January 5, 7, 2018.

DISSOLVED OXYGEN: Maximum recorded, 13.4 mg/L, January 8, 2014; minimum recorded, 1.4 mg/L, August 4, 2023.

TURBIDITY: Maximum: 1098 FNU on July 21, 2023; minimum recorded, 0.7 FNU, April 23, 2012.