USGS Water-Year Summary for Site 02203863

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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(Min.,Max.,Mean)
	00400 pH(Max.,Min.,Med.)
	63680 Turbidity, Form Neph(Med.,Max.,Min.)

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

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USGS Water-Year Summary 2023

02203863 SHOAL CREEK AT COLUMBIA DRIVE NEAR ATLANTA, GA

LOCATION - Lat 33°41'35.5", long 84°15'14" referenced to North American Datum of 1983, Dekalb County, GA, Hydrologic Unit 03070103,

DRAINAGE AREA - 8.63 mi².

SURFACE-WATER RECORDS

PERIOD OF RECORD - DISCHARGE: February 2010 to current year. GAGE-HEIGHT: February 2010 to current year.

GAGE - Satellite telemetry with a water-stage recorder. Datum of gage is 744.07 feet above the North American Vertical Datum (NAVD) of 1988 (leveling by Global Positioning System equipment).

COOPERATION - DeKalb County Department of Watershed Management

REMARKS - Gage-height records are generally fair. 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, unknown; maximum gage-height, 13.42 feet, December 24, 2015; minimum daily discharge recorded, 0.57 cfs, September 3, 2011.

CLIMATOLOGICAL RECORDS

PERIOD OF RECORD - February 2010 to current year.

INSTRUMENTATION - Tipping-bucket raingage.

WATER-QUALITY RECORDS

PERIOD OF RECORD - March 2012 to current.

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

INSTRUMENTATION - Satellite telemetry, a continuous water-quality monitor, and an automated refrigerated sampler.

REMARKS -
For period 10/01/2014-09/30/2015: Water temperature, Specific conductance, and pH records are rated good. Dissolved oxygen records are rated fair. Turbidity records are poor.
For period 10/01/2015-09/30/2016: Water temperature, Specific conductance, and pH records are rated good. Dissolved oxygen records are rated fair. Turbidity records are poor.
For period 10/01/2016-09/30/2017: Water temperature, Specific conductance, and pH records are rated good. Dissolved oxygen records are rated fair. Turbidity records are poor.
For period 10/01/2017-09/30/2018: Water temperature, Specific conductance, and pH records are rated good. Dissolved oxygen records are rated fair. Turbidity records are poor.
For period 10/01/2018-09/30/2019: Water temperature, Specific conductance, and pH records are rated good. Dissolved oxygen records are rated fair. Turbidity records are 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). 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, 898 microsiemens, January 22, 2018; minimum recorded, 20 microsiemens, August 2, 2019.

pH: Maximum recorded, 9.2 units, December 20, 2017; minimum recorded, 5.9 units, June 14, 2016, August 2, 2016, October 10, 11, 2020.

WATER TEMPERATURE: Maximum recorded, 28.8°C, July 1, 2012; minimum recorded, 0.0°C, January 7, 30, 2014, January 18, 2018.

DISSOLVED OXYGEN: Maximum recorded, 15.0 mg/L, February 20, 2015; minimum recorded, 2.9 mg/L, April 28, 2013.

TURBIDITY: Maximum recorded, >1100 FNU, June 28, 2016, June 11, 2018, June 12, 2018, July 21, 2018, and April 19, 2019; minimum recorded, <0.5 FNU, on several days.