Mill Creek

Noses Creek

Chattahoochee River

CARROLL

COUNTY

COBB COUNTY

PAULDING

COUNTY

DOUGLAS

COUNTY

Flood-Inundation Map of Sweetwater Creek in Cobb and Douglas Counties, Georgia, Corresponding to a Gage Height of 32.0 Feet and an Elevation of 889.3 Feet 

(NAVD 88) at the U.S. Geological Survey Streamgage Sweetwater Creek near Austell, Georgia (Station ID 02337000)

02336910

02337000

AUSG1

02336986

Scientific Investigations Map 3220

Sheet 21 of 21

Pamphlet accompanies map

Prepared in cooperation with

Cobb County, Georgia

Prepared in coordination with the

National Weather Service

http://water.weather.gov/ahps/

pcpn_and_river_forecasting.pdf U.S. Department of the Interior

U.S. Geological Survey

Base from U.S. Geological Survey High-Resolution Orthoimagery 

 for the Atlanta, Georgia Urban Area, 2010 

Transverse Mercator projection, State Plane Coordinate System 

Georgia West, FIPS 1002, North American Datum of 1983 (NAD 83)

0

0 250 500 750 1,000 METERS

1,000 2,000 3,000 4,000 5,000 FEET

Suggested citation:

Musser, J.W., 2012, Flood-inundation maps for Sweetwater Creek 

from above the Confluence of Powder Springs Creek to the Interstate 

20 Bridge, Cobb and Douglas Counties, Georgia: U.S. Geological 

Survey Scientific Investigations Map 3220, 10 p. pamphlet, 

21 sheets; available online only at http://pubs.usgs.gov/sim/3220/.

THORNTON ROAD

OLD ALABAMA

NORFOLK SOUTHERN RAILROAD

C H JAMES PARKWAY

WESTSIDE ROAD

Powder Springs

Creek

20

CLAY ROAD

Olley Creek

Noses Creek

Butternut Creek

OLD ALABAMA

MAXHAM ROAD

NORFOLK SOUTHERN RAILROAD

POWDER 

SPRINGS 

ROAD

VETERANS MEMORIAL

OLD MARIETTA ROAD

SKYVIEW DRIVE

HIGHWAY

ROAD

Map

area

Chattahoochee

GEORGIA

River

EXPLANATION

Model boundary

USGS streamgage 

 and identifier

Flood-inundation area

Cobb County

Douglas County

Direction of surface-

 water flow

02336910

02337000

AUSG1

Sweetwater

Creek

Olley Creek

02337000

02336910

AUSG1 USGS streamgage and 

 NWS forecast site 

 and identifiers

Powder Springs Cr

02336986

Disclaimer for Flood-Inundation Maps

Inundated areas shown should not be used for navigation, regulatory, permitting, or other legal purposes. The USGS provides these maps “as-is” for a quick reference, 

emergency planning tool but assumes no legal liability or responsibility resulting from the use of this information.

Uncertainties and Limitations for Use of Flood-Inundation Maps 

Although the flood-inundation maps represent the boundaries of inundated areas with a distinct line, some uncertainty is associated with these maps. The flood 

boundaries shown were estimated based on water stages (water-surface elevations) and streamflows at selected USGS streamgages. Water-surface elevations along 

the stream reaches were estimated by steady-state hydraulic modeling, assuming unobstructed flow, and by using streamflows and hydrologic conditions anticipated 

at the USGS streamgage(s). The hydraulic model reflects the land-cover characteristics and any bridge, dam, levee, or other hydraulic structures existing as of 

September 2011. Unique meteorological factors (timing and distribution of precipitation) may cause actual streamflows along the modeled reach to vary from those 

assumed during a flood, which may lead to deviations in the water-surface elevations and inundation boundaries shown. Additional areas may be flooded due to 

unanticipated conditions such as changes in the streambed elevation or roughness, backwater into major tributaries along a main stem river, or backwater from 

localized debris or ice jams. The accuracy of the floodwater extent portrayed on these maps will vary with the accuracy of the digital elevation model used to simulate 

the land surface. Additional uncertainties and limitations pertinent to this study are described in the document accompanying this set of flood-inundation map plates.

If this series of flood-inundation maps will be used in conjunction with National Weather Service (NWS) river forecasts, the user should be aware of additional 

uncertainties that may be inherent or factored into NWS forecast procedures. The NWS uses forecast models to estimate the quantity and timing of water flowing 

through selected stream reaches in the United States. These forecast models (1) estimate the amount of runoff generated by precipitation and snowmelt, (2) simulate 

the movement of floodwater as it proceeds downstream, and (3) predict the flow and stage (and water-surface elevation) for the stream at a given location (Advanced 

Hydrologic Prediction Service [AHPS] forecast point) throughout the forecast period (every 6 hours and 3–5 days out in many locations). For more information on 

AHPS forecasts, please see: http://water.weather.gov/ahps/pcpn_and_river_forecasting.pdf.

COBB COUNTY 

DOUGLAS COUNTY