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Water-Year Summary for Site 02204037

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  • Water-Year Summary reports summarize a year of hydrologic data in a printer-friendly format.
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Available Parameters
00010 Temperature, water(Min.,Max.,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(Med.,Max.,Min.)  

Water year 2020: 2019-10-01 to 2020-09-30
 

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USGS Water-Year Summary 2020
02204037 POLE BRIDGE CR AT EVANS MILL RD NEAR LITHONIA, GA
LOCATION - Lat 33°40'05.5", long 84°09'04.2" referenced to North American Datum of 1983, Dekalb County, GA, Hydrologic Unit 03070103,
DRAINAGE AREA - 16.1 mi².
REVISIONS HISTORY - Discharge for the period Aug. 24, 2019, to Aug. 30, 2019, was revised on Mar. 20, 2020, based on changes to the estimated discharge.
SURFACE-WATER RECORDS
PERIOD OF RECORD -
DISCHARGE: May 2012 to current year.
GAGE-HEIGHT: May 2012 to current year.
GAGE - --Satellite telemetry with water-stage recorder. Datum of gage is 735 feet above National Geodetic Vertical Datum (NGVD) of 1929 (from topographic map).
COOPERATION - DeKalb County Department of Watershed Protection.
REMARKS -
For period 09/30/2012-12/19/2016: Discharge record fair, except for days of estimated discharge, which are poor. Gage-height record good.
For period 12/20/2016-04/18/2018: Discharge record fair, except for days of estimated discharge, which are poor. Gage-height record fair.
For period 04/19/2012-12/11/2018: Discharge record fair, except for days of estimated discharge, which are poor. Gage-height record good.
For period 12/11/2018-09/30/2019: Discharge record fair, except for days of estimated discharge, which are poor. Gage-height record good.
For period 10/01/2019-12/04/2019: Discharge record fair, except for days of estimated discharge, which are poor. Gage-height record fair.
EXTREMES FOR PERIOD OF RECORD - Maximum discharge, 1,320 cfs, estimated, April 19, 2019; maximum gage-height, unknown, April 19, 2019; minimum daily discharge, 0.10 cfs, July 2, 3, 2012.
CLIMATOLOGICAL RECORDS
PERIOD OF RECORD - May 2012 to current year.
INSTRUMENTATION - Tipping-bucket rain gage.
WATER-QUALITY RECORDS
PERIOD OF RECORD - November 2012 to current year.
PERIOD OF DAILY RECORD -
SPECIFIC CONDUCTANCE: November 2012 to current year.
pH: November 2012 to current year.
WATER TEMPERATURE: November 2012 to current year.
DISSOLVED OXYGEN: November 2012 to current year.
TURBIDITY: November 2012 to current year.
INSTRUMENTATION - Satellite telemetry, a continuous water-quality monitor, and an automated refrigerated sampler.
REMARKS -
For period 10/01/2012-09/30/2013: Specific conductance records rated fair. Water temperature, pH and dissolved oxygen records rated good. Turbidity records rated fair.
For period 10/01/2013-09/30/2014: Specific conductance records rated fair. Water temperature, pH and dissolved oxygen records rated good. Turbidity records rated fair.
For period 10/01/2014-09/30/2015: Specific conductance records rated fair. Water temperature, pH and dissolved oxygen records rated good. Turbidity records rated fair.
For period 10/01/2015-09/30/2016: Specific conductance records rated fair. Water temperature, pH and dissolved oxygen records rated good. Turbidity records rated fair.
For period 10/01/2016-09/30/2017: Specific conductance records rated fair. Water temperature, pH and dissolved oxygen records rated good. Turbidity records rated fair.
For period 10/01/2017-09/30/2018: Specific conductance records rated fair. Water temperature, pH and dissolved oxygen records rated good. Turbidity records rated fair.
For period 10/01/2018-09/30/2019: Specific conductance records rated fair. Water temperature, pH and dissolved oxygen records rated good. Turbidity records rated 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). 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, microbiology, air temperature, and dissolved oxygen are by the U.S. Geological Survey.
EXTREMES FOR PERIOD OF RECORD -

SPECIFIC CONDUCTANCE: Maximum, 220 microsiemens, February 13, 2014; minimum, 21 microsiemens, August 11, 2017.

pH: Maximum, 7.9 units, November 15, 2012; minimum, 5.8 units, April 19, 2019.

WATER TEMPERATURE: Maximum, 27.5°C, July 19, 2020; minimum, 0.3°C, January 30, 2014.

DISSOLVED OXYGEN: Maximum, 13.6 mg/L, January 30, 2014; minimum, 4.1 mg/L, July 14-17, 2014.

TURBIDITY: Maximum, 822 FNU, December 20, 2017; minimum, 0.7 FNU, June 13, 14, 2016.