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.
USGS Water-Year Summary 2024
02336340 NANCY CREEK AT JOHNSON FERRY RD, AT CHAMBLEE, GA
LOCATION - Lat 33°53'51.9", long 84°20'42.9" referenced to North American Datum of 1983, Dekalb County, GA, Hydrologic Unit 03130001,
DRAINAGE AREA - 17.8 mi².
SURFACE-WATER RECORDS
PERIOD OF RECORD -
DISCHARGE: March 2012 to current year.
GAGE-HEIGHT: March 2012 to current year.
DISCHARGE: March 2012 to current year.
GAGE-HEIGHT: March 2012 to current year.
GAGE - Satellite telemetry with a water-stage recorder and continuous water-quality monitor. Datum of gage is 837.47 feet above NAVD88.
COOPERATION - DeKalb County Department of Watershed Protection.
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 3,360 cfs August 9, 2017; maximum gage-height recorded, 17.62 feet, August 9, 2017; minimum daily discharge, 0.92 cfs, July 1, 2013.
Maximum discharge recorded 3,360 cfs August 9, 2017; maximum gage-height recorded, 17.62 feet, August 9, 2017; minimum daily discharge, 0.92 cfs, July 1, 2013.
CLIMATOLOGICAL RECORDS
PERIOD OF RECORD - February 2012 to current year.
INSTRUMENTATION - Tipping-bucket raingage.
WATER-QUALITY RECORDS
PERIOD OF DAILY RECORD -
SPECIFIC CONDUCTANCE: December 2012 to current year.
pH: December 2012 to current year.
WATER TEMPERATURE: December 2012 to current year.
DISSOLVED OXYGEN: December 2012 to current year.
TURBIDITY: December 2012 to current year.
SPECIFIC CONDUCTANCE: December 2012 to current year.
pH: December 2012 to current year.
WATER TEMPERATURE: December 2012 to current year.
DISSOLVED OXYGEN: December 2012 to current year.
TURBIDITY: December 2012 to current year.
INSTRUMENTATION - Satellite telemetry with a continuous water-quality monitor and an automatic refrigerated sampler.
REMARKS -
For period: 10/01/2014-09/30/2015: Water temperature records are good. Specific conductance records are good. Turbidity records are poor. pH records are good. Dissolved Oxygen records are good.
For period: 10/01/2015-09/30/2016: Water temperature, specific conductance, pH, and dissolved oxygen records are rated good. Turbidity records are fair.
For period: 10/01/2016-09/30/2017: Water temperature, specific conductance, pH, and dissolved oxygen records are rated good. Turbidity records are fair.
For period: 10/01/2017-09/30/2018: Water temperature, specific conductance, pH, and dissolved oxygen records are rated good. Turbidity records are fair.
For period: 10/01/2018-09/30/2019: Water temperature, specific conductance, pH, and dissolved oxygen records are rated good. 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). Hydrologic event 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, specific conductance, pH, water temperature, turbidity, barometric pressure, air temperature, microbiology, and dissolved oxygen are by the U.S. Geological Survey.
For period: 10/01/2014-09/30/2015: Water temperature records are good. Specific conductance records are good. Turbidity records are poor. pH records are good. Dissolved Oxygen records are good.
For period: 10/01/2015-09/30/2016: Water temperature, specific conductance, pH, and dissolved oxygen records are rated good. Turbidity records are fair.
For period: 10/01/2016-09/30/2017: Water temperature, specific conductance, pH, and dissolved oxygen records are rated good. Turbidity records are fair.
For period: 10/01/2017-09/30/2018: Water temperature, specific conductance, pH, and dissolved oxygen records are rated good. Turbidity records are fair.
For period: 10/01/2018-09/30/2019: Water temperature, specific conductance, pH, and dissolved oxygen records are rated good. 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). Hydrologic event 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, 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 -
WATER TEMPERATURE: Maximum, 30.2°C, July 30, 2015; minimum, -0.3°C, January 30, 2014.
SPECIFIC CONDUCTANCE: Maximum, 438 microsiemens, February 03, 2014; minimum, 20 microsiemens, February 10, 2020.
DISSOLVED OXYGEN: Maximum, 13.6 mg/L, January 5, 2018; minimum, 4.2 mg/L, May 12, 2017, November 23, 2019.
pH: Maximum, 9.6 standard units, March 10, 2022; minimum, 6.0 units, August 13, 2015.
TURBIDITY: Maximum, 1,020 FNU on March 3, 2019; minimum, <0.5 FNU, on several days.
WATER TEMPERATURE: Maximum, 30.2°C, July 30, 2015; minimum, -0.3°C, January 30, 2014.
SPECIFIC CONDUCTANCE: Maximum, 438 microsiemens, February 03, 2014; minimum, 20 microsiemens, February 10, 2020.
DISSOLVED OXYGEN: Maximum, 13.6 mg/L, January 5, 2018; minimum, 4.2 mg/L, May 12, 2017, November 23, 2019.
pH: Maximum, 9.6 standard units, March 10, 2022; minimum, 6.0 units, August 13, 2015.
TURBIDITY: Maximum, 1,020 FNU on March 3, 2019; minimum, <0.5 FNU, on several days.
