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South Atlantic Water Science Center - Georgia

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Picture of a combined sewage overflow outflow point during Sept. 2009 flooding in Atlanta, Georgia.

 

SEPTEMBER 2009 FLOODING

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September 2009 Flooding
Crooked Creek at Norcross (02335350)

Hydrologic information for this site Hydrologic information for this site.

South Atlantic Water Science Center - Georgia hydrographers manually measuring streamflow. The crane holds a heavy weight and a "current meter", which has vanes that spin in the water current. The scientist counts the spins to measure a velocity reading of the water. By doing this at a number of points both vertically and horizontally across the stream, a "discharge measurement" is completed that gives the streamflow, which is the amount, in cubic feet per second, of water flowing at the time of measurement. The streamflow is measured at the current "gage height", which is the height, in feet, of the stream above a certain point.

South Atlantic Water Science Center - Georgia hydrologists measuring streamflow.
Credit: USGS

South Atlantic Water Science Center - Georgia hydrologists measuring the stage of the water. The metal box holds a wire attached to a weight, which is used to make a quick measurement of stream stage, or gage height. The scientist lowers a weight from the box until the bottom of the weight just touches the water to make a measurement.

South Atlantic Water Science Center - Georgia hydrologists measuring streamflow.
Credit: USGS

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Page Last Modified: Friday, 03-Oct-2014 07:28:51 EDT