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Scientific Investigations Map 3189

Flood-Inundation Maps for Peachtree Creek from the Norfolk Southern Railway Bridge to the Moores Mill Road NW Bridge, Atlanta, Georgia

Jonathan W. Musser

Prepared in cooperation with the City of Atlanta, Georgia

ABSTRACT

Thumbnail of and link to report PDF (10 MB)

Digital flood-inundation maps for a 5.5-mile reach of the Peachtree Creek from the Norfolk Southern Railway bridge to the Moores Mill Road NW bridge, were developed by the U.S. Geological Survey (USGS) in cooperation with the City of Atlanta, Georgia. The inundation maps, which can be accessed through the USGS Flood Inundation Mapping Science Web site at http://water.usgs.gov/osw/flood_inundation/, depict estimates of the areal extent and depth of flooding corresponding to selected water levels (stages) at the USGS streamgage at Peachtree Creek at Atlanta, Georgia (02336300) and the USGS streamgage at Chattahoochee River at Georgia 280, near Atlanta, Georgia (02336490). Current water level (stage) at these USGS streamgages may be obtained at http://waterdata.usgs.gov/ and can be used in conjunction with these maps to estimate near real-time areas of inundation. The National Weather Service (NWS) is incorporating results from this study into the Advanced Hydrologic Prediction Service (AHPS) flood warning system (http:/water.weather.gov/ahps/). The NWS forecasts flood hydrographs at many places that commonly are collocated at USGS streamgages. The forecasted peak-stage information for the USGS streamgage at Peachtree Creek, which is available through the AHPS Web site, may be used in conjunction with the maps developed in this study to show predicted areas of flood inundation.

A one-dimensional step-backwater model was developed using the U.S. Army Corps of Engineers HEC–RAS software for a 6.5-mile reach of Peachtree Creek and was used to compute flood profiles for a 5.5-mile reach of the creek. The model was calibrated using the most current stage-discharge relations at the Peachtree Creek at Atlanta, Georgia, streamgage (02336300), and the Chattahoochee River at Georgia 280, near Atlanta, Georgia, streamgage (02336490) as well as high water marks collected during the 2010 annual peak flow event. The hydraulic model was then used to determine 50 water-surface profiles. The profiles are for 10 flood stages at the Peachtree Creek streamgage at 1-foot intervals referenced to the streamgage datum and ranging from just above bankfull stage (15.0 feet) to approximately the highest recorded water level at the streamgage (24.0 feet). At each stage on Peachtree Creek, five stages at the Chattahoochee River streamgage, from 26.4 feet to 38.4 feet in 3-foot intervals, were used to determine backwater effects. The simulated water-surface profiles were then combined with a geographic information system digital elevation model—derived from Light Detection and Ranging (LiDAR) data having a 0.3-foot vertical and 16.4-foot horizontal resolution—to delineate the area flooded for each 1-foot increment of stream stage.

The availability of these maps, when combined with real-time information regarding current stage from USGS streamgages and forecasted stream stages from the NWS, provide emergency management personnel and residents with critical information during flood response activities, such as evacuations and road closures as well as for postflood-recovery efforts.

For additional information contact:
Director, Georgia Water Science Center
U.S. Geological Survey
3039 Amwiler Rd.
Suite 130
Atlanta, GA 30360-2824
http://ga.water.usgs.gov/

Part or all of this report is presented in Portable Document Format (PDF); the latest version of Adobe Reader or similar software is required to view it. Download the latest version of Adobe Reader, free of charge.

Contents

Abstract

Introduction

Purpose and Scope

Study Area Description

Previous Studies

Constructing Water-Surface Profiles

Hydrologic and Steady Flow Data

Topographic and Bathymetric Data

Energy Loss Factors

Model Calibration and Performance

Development of Water-Surface Profiles

Inundation Mapping

Peachtree Creek, Georgia Flood-Inundation Maps on the Internet

Uncertainties and Limitations Regarding Use of Flood Inundation Maps

Disclaimer for Flood Inundation Maps

Summary

References Cited



Map Sheets

You can view the map sheets either as high-resolution JPG images or as downloadable PDF files.
The JPG images are about 4 Megabytes in size, and the PDF files are about 12 Megabytes.

Sheet number reference based on stages (water-surface elevations) at Peachtree Creek at Atlanta, Georgia streamgage (02336300) and Chattahoochee River at Georgia 280, near Atlanta, Georgia streamgage (02336490).
[Values 15.0-24.0 represent stage heights, in feet above gage datum. Values in parentheses (779.2-788.2) represent elevation in feet above North American Vertical Datum of 1988]

Map Sheets
Chattahoochee
River at
Georgia 280
Peachtree Creek at Atlanta, Georgia
15.0
(779.2)
16.0
(780.2)
17.0
(781.2)
18.0
(782.2)
19.0
(783.2)
20.0
(784.2)
21.0
(785.2)
22.0
(786.2)
23.0
(787.2)
24.0
(788.2)
26.4
(763.0)
1
JPG
PDF
2
JPG
PDF
3
JPG
PDF
4
JPG
PDF
5
JPG
PDF
6
JPG
PDF
7
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PDF
8
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PDF
9
JPG
PDF
10
JPG
PDF
29.4
(766.0)
11
JPG
PDF
12
JPG
PDF
13
JPG
PDF
14
JPG
PDF
15
JPG
PDF
16
JPG
PDF
17
JPG
PDF
18
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PDF
19
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PDF
20
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PDF
32.4
(769.0)
21
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PDF
22
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PDF
23
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PDF
24
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PDF
25
JPG
PDF
26
JPG
PDF
27
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PDF
28
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PDF
29
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PDF
30
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PDF
35.4
(772.0)
31
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PDF
32
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PDF
33
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PDF
34
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PDF
35
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PDF
36
JPG
PDF
37
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PDF
38
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PDF
39
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PDF
40
JPG
PDF
38.4
(775.0)
41
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PDF
42
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PDF
43
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PDF
44
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PDF
45
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PDF
46
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PDF
47
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48
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49
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PDF
50
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PDF

Suggested citation:

Musser, J.W., 2012, Flood-inundation maps for Peachtree Creek from the Norfolk Southern Railway bridge to the Moores Mill Road NW bridge, Atlanta, Georgia: U.S. Geological Survey Scientific Investigations Map 3189, 9 p., 50 sheets; available online at http://pubs.usgs.gov/sim/3189/.

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