BigCreek_6_0

Shapefile

Tags
Big Creek, Alpharetta, Roswell, high-water marks, flooded area, flood, Georgia, geospatial analysis, river/stream, flood-inundation maps


Summary

This dataset was created to support the development of flood-peak inundation maps for Big Creek in Alpharetta and Roswell, Georgia

Description

Digital flood-inundation maps for a 12.4-mile reach of Big Creek the McGinnis Ferry Road bridge to the Confluence of Hog Wallow Creek, Alpharetta and Roswell, Georgia, were created by the USGS in cooperation with the cities of Alpharetta and Roswell, Georiga. 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 Big Creek near Alpharetta, Georgia (02335700). Current conditions at the USGS streamgage may be obtained on the Internet. In addition, the information has been provided to the National Weather Service (NWS) for incorporation into their Advanced Hydrologic Prediction Service (AHPS) flood warning system (http:/water.weather.gov/ahps/). The NWS forecasts flood hydrographs at many places that are often collocated at USGS streamgages. The forecasted peak-stage information, also available on the Internet, may be used in conjunction with the maps developed in this study to show predicted areas of flood inundation. In this study, flood profiles were computed for the stream reach by means of a one-dimensional step-backwater model. The model was calibrated using the most current stage-discharge relations at the Big Creek near Alpharetta (02335700) streamgage and documented high-water marks from a recent floods. The hydraulic model was then used to determine 19 water-surface profiles for flood stages at 0.5-foot intervals referenced to the streamgage datum and ranging from bankfull (6.0 feet) to approximately 1.95 feet above the highest recorded water level at the streamgage. The flood-peak inundation area was modeled in a GIS by combining steady-state hydraulic modeling and available lidar digital elevation model (DEM) data. Information about the study, floods, and methods used can be found in the USGS Scientific Investigations Map 3338. https://dx.doi.org/10.3133/sim3338

Credits

Use limitations

Although these data have been used by the U.S. Geological Survey, U.S. Department of the Interior, no warranty expressed or implied is made by the U.S. Geological Survey as to the accuracy of the data. The act of distribution shall not constitute any such warranty, and no responsibility is assumed by the U.S. Geological Survey in the use of this data, software, or related materials. Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government. The flood boundaries shown were estimated based on water stages/streamflows at the USGS streamflow-gaging station Big Creek near Alpharetta, Georgia (02335700), steady-state hydraulic modeling (assuming unobstructed flow), and a digital elevation model. The hydraulic model reflects the land-cover characteristics and any bridge, dam, levee, or other hydraulic structures existing on May, 2015. Unique meteorological factors (timing and distribution of storm) could cause actual streamflows along the modeled reach to vary from those assumed during a flood, which may lead to deviations from the water surface elevations and inundation boundaries shown here. Additional areas may be flooded due to unanticipated backwater from major tributaries along the main stem or from localized debris- or ice-jams. Inundated areas shown should not be used for navigation, regulatory, permitting, or other legal purposes. Although USGS intends to make this server available 24 hours a day, seven days a week, timely delivery of data and products from this server through the Internet is not guaranteed. 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. 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 which may be inherent or factored into NWS forecast procedures. The NWS uses river forecast models to estimate the quantity and timing of water flowing through selected river reaches in the United States. These forecast models (1) estimate the amount of runoff generated by a precipitation event, (2) compute how the water will move downstream, and (3) predict the flow and stage (water surface elevation) for the river at a given location (AHPS forecast point) throughout the forecast period (every six hours and 3 to 5 days out in many locations). For more information on AHPS forecasts, please see: http://water.weather.gov/ahps/pcpn_and_river_forecasting.pdf .

Extent

West -84.353091   East -84.225417
North 34.100760   South 34.016715

Scale Range
Maximum (zoomed in) 1:5,000
Minimum (zoomed out) 1:150,000,000

ArcGIS Metadata 

Topics and Keywords 

Themes or categories of the resource  elevation, environment, inlandWaters


*Content type  Downloadable Data
Export to FGDC CSDGM XML format as Resource Description No

Place keywords  Big Creek, Alpharetta, Roswell, Georgia

Theme keywords  high-water marks, flooded area, flood, geospatial analysis, river/stream, flood-inundation maps

Citation 

*Title BigCreek_6_0
Publication date 2015-07-30 00:00:00


Presentation formats* digital map


Series
Name SIM
Issue 3338

Collection title Flood-Inundation Maps for the Big Creek from 260 feet above McGinnis Ferry Road bridge to the the Confluence of Hog Wallow Creek, Alpharetta and Roswell, Georgia


Citation Contacts 

Responsible party
Organization's name U.S. Geological Survey, South Atlantic Water Science Center
Contact's role  originator


Responsible party
Organization's name U.S. Geological Survey
Contact's role  publisher


Contact information
Address
Type
Delivery point Reston, Virginia



Resource Details 

Dataset languages  English (UNITED STATES)
Dataset character set  utf8 - 8 bit UCS Transfer Format


Status  completed
Spatial representation type* vector


Supplemental information
A GIS application was used to produce a plane representing the flood-peak water surface. The application duplicates the water-surface-elevation data from cross-section points across the flood plain perpendicular to the direction of the flood flow. Elevations between water-surface points on the cross-sections are proportional interpolations of the water-surface-elevation data and were positioned to generate a flood surface sloping with the water flow. A raster surface was created with the data points using a spline interpolation method, forming the estimated flood surface. A flood-depth grid was made by subtracting the DEM from the flood surface. The flood-peak inundation areas are available in a GIS format, polyline shapefile, that provides extent of the flood peak for each stage level. This format allows the GIS data to be overlain on maps and aerial photographs, and to be used for various GIS applications, such as FEMA's Hazards U.S. Multi-Hazards (HAZUS-MH) program (Federal Emergency Management Agency, 2010b) to estimate flood damages. For more information on data processing and checking procedures, see the full report at https://dx.doi.org/10.3133/sim3338 Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government. Although this Federal Geographic Data Committee-compliant metadata file is intended to document the dataset in nonproprietary form, as well as in ArcGIS format, this metadata file may include some ArcGIS-specific terminology.

*Processing environment Microsoft Windows 7 Version 6.1 (Build 7601) Service Pack 1; Esri ArcGIS 10.2.2.3552


ArcGIS item properties
*Name BigCreek_6_0
*Size 0.777
*Location file://\\IGSAYEEWWS134\E\Big_Creek\publish\inundation_layers\BigCreek_6_0.shp
*Access protocol Local Area Network

Extents 

Extent
Description
ground condition

Geographic extent
Bounding rectangle
West longitude -84.353091
East longitude -84.225417
South latitude 34.016715
North latitude 34.100760
Extent contains the resource Yes

Temporal extent
Date and time 2015-07-30 00:00:00

Extent
Geographic extent
Bounding rectangle
Extent type  Extent used for searching
*West longitude -84.353091
*East longitude -84.225417
*North latitude 34.100760
*South latitude 34.016715
*Extent contains the resource Yes

Extent in the item's coordinate system
*West longitude 2240150.499937
*East longitude 2278781.500103
*South latitude 1461195.329877
*North latitude 1491731.846232
*Extent contains the resource Yes

Resource Points of Contact 

Point of contact
Organization's name US Geological Survey, South Atlantic Water Science Center
Contact's role  point of contact


Contact information
Phone
Voice 678-924-6700

Address
Type both
Delivery point 1770 Corporate Drive, Suite 500
City Norcross
Administrative area Georgia
Postal code 30097
Country US



Resource Maintenance 

Resource maintenance
Update frequency  not planned


Resource Constraints 

Legal constraints
Limitations of use
Although these data have been used by the U.S. Geological Survey, U.S. Department of the Interior, no warranty expressed or implied is made by the U.S. Geological Survey as to the accuracy of the data. The act of distribution shall not constitute any such warranty, and no responsibility is assumed by the U.S. Geological Survey in the use of this data, software, or related materials. Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government. This coverage may be reistributed if it is not edited and is properly referenced. The flood boundaries shown were estimated based on water stages/streamflows at the USGS streamflow-gaging station Big Creek near Alpharetta, Georgia (02335700), steady-state hydraulic modeling (assuming unobstructed flow), and a digital elevation model. The hydraulic model reflects the land-cover characteristics and any bridge, dam, levee, or other hydraulic structures existing on May 2015. Unique meteorological factors (timing and distribution of storm) could cause actual streamflows along the modeled reach to vary from those assumed during a flood, which may lead to deviations from the water surface elevations and inundation boundaries shown here. Additional areas may be flooded due to unanticipated backwater from major tributaries along the main stem or from localized debris- or ice-jams. Inundated areas shown should not be used for navigation, regulatory, permitting, or other legal purposes. Although USGS intends to make this server available 24 hours a day, seven days a week, timely delivery of data and products from this server through the Internet is not guaranteed. 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. 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 which may be inherent or factored into NWS forecast procedures. The NWS uses river forecast models to estimate the quantity and timing of water flowing through selected river reaches in the United States. These forecast models (1) estimate the amount of runoff generated by a precipitation event, (2) compute how the water will move downstream, and (3) predict the flow and stage (water surface elevation) for the river at a given location (AHPS forecast point) throughout the forecast period (every six hours and 3 to 5 days out in many locations). For more information on AHPS forecasts, please see: http://water.weather.gov/ahps/pcpn_and_river_forecasting.pdf .

Other constraints
None. This dataset is provided by USGS as a public service.

Constraints
Limitations of use

Although these data have been used by the U.S. Geological Survey, U.S. Department of the Interior, no warranty expressed or implied is made by the U.S. Geological Survey as to the accuracy of the data. The act of distribution shall not constitute any such warranty, and no responsibility is assumed by the U.S. Geological Survey in the use of this data, software, or related materials. Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government. The flood boundaries shown were estimated based on water stages/streamflows at the USGS streamflow-gaging station Big Creek near Alpharetta, Georgia (02335700), steady-state hydraulic modeling (assuming unobstructed flow), and a digital elevation model. The hydraulic model reflects the land-cover characteristics and any bridge, dam, levee, or other hydraulic structures existing on May, 2015. Unique meteorological factors (timing and distribution of storm) could cause actual streamflows along the modeled reach to vary from those assumed during a flood, which may lead to deviations from the water surface elevations and inundation boundaries shown here. Additional areas may be flooded due to unanticipated backwater from major tributaries along the main stem or from localized debris- or ice-jams. Inundated areas shown should not be used for navigation, regulatory, permitting, or other legal purposes. Although USGS intends to make this server available 24 hours a day, seven days a week, timely delivery of data and products from this server through the Internet is not guaranteed. 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. 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 which may be inherent or factored into NWS forecast procedures. The NWS uses river forecast models to estimate the quantity and timing of water flowing through selected river reaches in the United States. These forecast models (1) estimate the amount of runoff generated by a precipitation event, (2) compute how the water will move downstream, and (3) predict the flow and stage (water surface elevation) for the river at a given location (AHPS forecast point) throughout the forecast period (every six hours and 3 to 5 days out in many locations). For more information on AHPS forecasts, please see: http://water.weather.gov/ahps/pcpn_and_river_forecasting.pdf .


Spatial Reference 

ArcGIS coordinate system
*Type Projected
*Geographic coordinate reference GCS_North_American_1983
*Projection NAD_1983_StatePlane_Georgia_West_FIPS_1002_Feet
*Coordinate reference details
Projected coordinate system
Well-known identifier 102667
X origin -16150100
Y origin -43703500
XY scale 137255279.03396165
Z origin -100000
Z scale 10000
M origin -100000
M scale 10000
XY tolerance 0.0032808333333333331
Z tolerance 0.001
M tolerance 0.001
High precision true
Latest well-known identifier 2240
Well-known text PROJCS["NAD_1983_StatePlane_Georgia_West_FIPS_1002_Feet",GEOGCS["GCS_North_American_1983",DATUM["D_North_American_1983",SPHEROID["GRS_1980",6378137.0,298.257222101]],PRIMEM["Greenwich",0.0],UNIT["Degree",0.0174532925199433]],PROJECTION["Transverse_Mercator"],PARAMETER["False_Easting",2296583.333333333],PARAMETER["False_Northing",0.0],PARAMETER["Central_Meridian",-84.16666666666667],PARAMETER["Scale_Factor",0.9999],PARAMETER["Latitude_Of_Origin",30.0],UNIT["Foot_US",0.3048006096012192],AUTHORITY["EPSG",2240]]

Reference system identifier
*Value 2240
*Codespace EPSG
*Version 8.2.6


Spatial Data Properties 

Vector
*Level of topology for this dataset  geometry only


Geometric objects
Feature class name BigCreek_6_0
*Object type  composite
*Object count 1



ArcGIS Feature Class Properties
Feature class name BigCreek_6_0
*Feature type Simple
*Geometry type Polygon
*Has topology FALSE
*Feature count 1
*Spatial index TRUE
*Linear referencing FALSE



Data Quality 

Lineage 

Process step
When the process occurred 2015-07-30 00:00:00
Description
A GIS application was used to produce a plane representing the flood-peak water surface. The application duplicates the water-surface-elevation data from cross-section points of the hydraulic model across the flood plain perpendicular to the direction of the flood flow. Elevations between water-surface points on the cross-sections are proportional interpolations of the water-surface-elevation data and were positioned to generate a flood surface sloping with the water flow. A raster surface was created with the data points using a spline interpolation method, forming the estimated flood surface. A flood-depth grid was made by subtracting the DEM from the flood surface raster.





Source data
Description
Numeric hydraulic model was used to compute water surface profiles at selected elevations along mapped reach. The water surface profiles were then used to generate the inundation map boundaries.



Source medium name  online link
Resolution of the source data
Scale denominator 6000

Extent of the source data
Description
ground condition



Geoprocessing history 

Process
Process name
Date 2015-02-18 10:55:08
Tool location d:\arcgis\desktop10.2\ArcToolbox\Toolboxes\Data Management Tools.tbx\MultipartToSinglepart
Command issued
MultipartToSinglepart background_mask_6_0a E:\Big_Creek\export_final\inundation_work.gdb\background_mask_6_0b
Include in lineage when exporting metadata No


Process
Process name
Date 2015-02-18 10:56:20
Tool location d:\arcgis\desktop10.2\ArcToolbox\Toolboxes\Data Management Tools.tbx\Merge
Command issued
Merge background_mask_6_0b;bc_6_0a E:\Big_Creek\export_final\inundation_work.gdb\bc_6_0b "ORIG_FID "ORIG_FID" true true false 4 Long 0 0 ,First,#,background_mask_6_0b,ORIG_FID,-1,-1;SHAPE_Length "SHAPE_Length" false true true 8 Double 0 0 ,First,#,background_mask_6_0b,SHAPE_Length,-1,-1,bc_6_0a,Shape_Length,-1,-1;SHAPE_Area "SHAPE_Area" false true true 8 Double 0 0 ,First,#,background_mask_6_0b,SHAPE_Area,-1,-1,bc_6_0a,Shape_Area,-1,-1;ID "ID" true true false 8 Double 0 0 ,First,#,bc_6_0a,ID,-1,-1;GRIDCODE "GRIDCODE" true true false 8 Double 0 0 ,First,#,bc_6_0a,GRIDCODE,-1,-1"
Include in lineage when exporting metadata No


Process
Process name
Date 2015-02-18 11:06:26
Tool location d:\arcgis\desktop10.2\ArcToolbox\Toolboxes\Data Management Tools.tbx\CalculateField
Command issued
CalculateField bc_6_0b GRIDCODE 1 VB #
Include in lineage when exporting metadata No


Process
Process name
Date 2015-02-18 11:07:22
Tool location d:\arcgis\desktop10.2\ArcToolbox\Toolboxes\Data Management Tools.tbx\Dissolve
Command issued
Dissolve bc_6_0b E:\Big_Creek\export_final\inundation_work.gdb\bc_6_0c GRIDCODE # SINGLE_PART DISSOLVE_LINES
Include in lineage when exporting metadata No


Process
Process name
Date 2015-03-03 13:24:03
Tool location d:\arcgis\desktop10.2\ArcToolbox\Toolboxes\Data Management Tools.tbx\Dissolve
Command issued
Dissolve bc_6_0c E:\Big_Creek\export_final\inundation_work.gdb\bc_6_0d # # MULTI_PART DISSOLVE_LINES
Include in lineage when exporting metadata No


Process
Process name
Date 2015-03-03 14:07:24
Tool location d:\arcgis\desktop10.2\ArcToolbox\Toolboxes\Analysis Tools.tbx\Erase
Command issued
Erase bc_6_0d hole_6_0 E:\Big_Creek\export_final\inundation_work.gdb\bc_6_0e #
Include in lineage when exporting metadata No


Process
Process name
Date 2015-03-03 16:09:12
Tool location d:\arcgis\desktop10.2\ArcToolbox\Toolboxes\Data Management Tools.tbx\Append
Command issued
Append camp_creek bc_6_0e NO_TEST "Shape_Length "Shape_Length" false true true 8 Double 0 0 ,First,#,camp_creek,SHAPE_Length,-1,-1;Shape_Area "Shape_Area" false true true 8 Double 0 0 ,First,#,camp_creek,SHAPE_Area,-1,-1" #
Include in lineage when exporting metadata No


Process
Process name
Date 2015-03-03 16:10:09
Tool location d:\arcgis\desktop10.2\ArcToolbox\Toolboxes\Data Management Tools.tbx\Dissolve
Command issued
Dissolve bc_6_0e E:\Big_Creek\export_final\inundation_work.gdb\bc_6_0f # # MULTI_PART DISSOLVE_LINES
Include in lineage when exporting metadata No


Process
Process name
Date 2015-03-10 11:44:54
Tool location d:\arcgis\desktop10.2\ArcToolbox\Toolboxes\Analysis Tools.tbx\Clip
Command issued
Clip bc_6_0f boundary_polygon E:\Big_Creek\export_final\inundation_work.gdb\bc_6_0g #
Include in lineage when exporting metadata No


Process
Process name
Date 2015-05-11 11:07:51
Tool location d:\arcgis\desktop10.2\ArcToolbox\Toolboxes\Analysis Tools.tbx\Erase
Command issued
Erase bc_6_0g bridges E:\Big_Creek\export_final2\inundation_work2.gdb\bc_6_0h #
Include in lineage when exporting metadata No


Process
Process name
Date 2015-05-11 11:08:30
Tool location d:\arcgis\desktop10.2\ArcToolbox\Toolboxes\Analysis Tools.tbx\Clip
Command issued
Clip bc_6_0h boundary_polygon E:\Big_Creek\export_final2\inundation_work2.gdb\bc_6_0i #
Include in lineage when exporting metadata No


Process
Process name
Date 2015-08-04 16:26:33
Tool location d:\arcgis\desktop10.2\ArcToolbox\Toolboxes\Data Management Tools.tbx\CopyFeatures
Command issued
CopyFeatures E:\Big_Creek\publish\Big_Creek_Results.gdb\bc_6_0 E:\Big_Creek\publish\inundation_layers\bc_6_0.shp # 0 0 0
Include in lineage when exporting metadata No


Distribution 

Distributor
Contact information
Organization's name US Geological Survey, South Atlantic Water Science Center
Contact's position Hydrologist
Contact's role  originator


Contact information
Phone
Voice 678-924-6675
Fax 678-924-6710

Address
Type both
Delivery point 1770 Corporate Drive, Suite 500
City Norcross
Administrative area GA
Postal code 30093
Country US
e-mail addressjwmusser@usgs.gov



Available format
Name shapefile
Technical prerequisites Data are supplied in ArcGIS shapefile format. Format compatibility is the user's responsibility.




Distribution format
*Name Shapefile


Transfer options
*Transfer size 0.777


Online source
Locationhttps://dx.doi.org/10.3133/sim3338

Fields 

Details for object BigCreek_6_0 
*Type Feature Class
*Row count 1
Definition
Big Creek near Alpharetta, Georgia (02335700) flood-peak inundation area

Definition source
U.S. Geological Survey



Field Shape
 
*Alias Shape
*Data type Geometry
*Width 0
*Precision 0
*Scale 0
Field description
Feature geometry.

Description source
ESRI

Description of values
Coordinates defining the features.





Field FID
 
*Alias FID
*Data type OID
*Width 4
*Precision 0
*Scale 0
Field description
Internal feature number.

Description source
ESRI

*Description of values
Sequential unique whole numbers that are automatically generated.





Field Shape_Leng
 
*Alias Shape_Leng
*Data type Double
*Width 19
*Precision 0
*Scale 0
Field description
Internal feature length of line

Description source
ESRI



Field Shape_Area
 
*Alias Shape_Area
*Data type Double
*Width 19
*Precision 0
*Scale 0
*Field description
Area of feature in internal units squared.

*Description source
Esri

*Description of values
Positive real numbers that are automatically generated.







Overview Description
Entity and Attribute Overview
Each entity corresponds to an estimated flood extent area for stream stages 6.0 - 15.0 feet at the USGS streamgage Big Creek near Alpharetta, Georgia (02335700). The attributes represent the USGS station 02335700, USGS stage height associated with the area, and NAVD88 elevation that correlates with the stage.



Entity and Attribute Detail Citation
Musser, J.W., 2015, Flood-inundation maps for Big Creek from the McGinnis Ferry Road Bridge to the confluence of Hog Wallow Creek, Alpharetta and Roswell, Georgia: U.S. Geological Survey Scientific Investigation Map 3338, 19 sheets, 10-p. pamphlet, https://dx.doi.org/10.3133/sim3338.





References 

Aggregate Information
Association type  larger work citation


Aggregate resource name
Title Flood-Inundation Maps for the Big Creek from McGinnis Ferry Road bridge to Confluence with Hog Wallow Creek, Georgia
Publication date 2015-07-30 00:00:00


Presentation formats  digital document
FGDC geospatial presentation format  document


Series
Name Scientific Investigations Map
Issue 3338

Other citation details
Musser, J.W., 2015, Flood-inundation maps for Big Creek from the McGinnis Ferry Road Bridge to the confluence of Hog Wallow Creek, Alpharetta and Roswell, Georgia: U.S. Geological Survey Scientific Investigation Map 3338, 19 sheets, 10-p. pamphlet, https://dx.doi.org/10.3133/sim3338.



Responsible party
Organization's name US Geological Survey, South Atlantic Water Science Center
Contact's role  originator


Responsible party
Organization's name U.S. Geological Survey
Contact's role  publisher


Contact information
Address
Type
Delivery point Reston, Virginia



Resource location online
Locationhttps://dx.doi.org/10.3133/sim3338



Metadata Details 

Metadata language English (UNITED STATES)
Metadata character set  utf8 - 8 bit UCS Transfer Format


Scope of the data described by the metadata  dataset
Scope name* dataset


*Last update 2015-08-12


ArcGIS metadata properties
Metadata format ArcGIS 1.0
Metadata style FGDC CSDGM Metadata
Standard or profile used to edit metadata FGDC


Created in ArcGIS for the item 2015-05-11 13:42:32
Last modified in ArcGIS for the item 2015-08-12 10:53:01


Automatic updates
Have been performed Yes
Last update 2015-08-12 10:53:01


Metadata Contacts 

Metadata contact
Organization's name US Geological Survey
Contact's position Ask USGS - Water Webserver Team
Contact's role  point of contact


Contact information
Phone
Voice 1-888-275-8747 (1-888-ASK-USGS)

Address
Type postal
Delivery point 507 National Center
City Reston
Administrative area Virginia
Postal code 20192
Country US



Metadata Maintenance 

Maintenance
Update frequency  not planned


Other maintenance requirements
Last metadata review date: 2015-08-06



FGDC Metadata (read-only) 

Entities and Attributes 

Detailed Description
Entity Type
Entity Type LabelBigCreek_6_0
Entity Type Definition
Big Creek near Alpharetta, Georgia (02335700) flood-peak inundation area
Entity Type Definition SourceU.S. Geological Survey

Attribute
Attribute LabelShape
Attribute Definition
Feature geometry.
Attribute Definition SourceESRI
Attribute Domain Values
Unrepresentable Domain
Coordinates defining the features.

Attribute
Attribute LabelFID
Attribute Definition
Internal feature number.
Attribute Definition SourceESRI
Attribute Domain Values
Unrepresentable Domain
Sequential unique whole numbers that are automatically generated.

Attribute
Attribute LabelShape_Leng
Attribute Definition
Internal feature length of line
Attribute Definition SourceESRI

Attribute
Attribute LabelShape_Area
Attribute Definition
Area of feature in internal units squared.
Attribute Definition SourceEsri
Attribute Domain Values
Unrepresentable Domain
Positive real numbers that are automatically generated.

Overview Description
Entity and Attribute Overview
Each entity corresponds to an estimated flood extent area for stream stages 6.0 - 15.0 feet at the USGS streamgage Big Creek near Alpharetta, Georgia (02335700). The attributes represent the USGS station 02335700, USGS stage height associated with the area, and NAVD88 elevation that correlates with the stage.
Entity and Attribute Detail Citation
Musser, J.W., 2015, Flood-inundation maps for Big Creek from the McGinnis Ferry Road Bridge to the confluence of Hog Wallow Creek, Alpharetta and Roswell, Georgia: U.S. Geological Survey Scientific Investigation Map 3338, 19 sheets, 10-p. pamphlet, https://dx.doi.org/10.3133/sim3338.