Magnitude and Frequency of Floods for Rural Streams in Georgia, South Carolina, and North Carolina, 2017-Data

Dates

Publication Date: 2023-04-28
Start Date: 1771
End Date: 2017

Citation

Kolb, K.R., Musser, J.W., Feaster, T.D., Gotvald, A.J., and Weaver, J.C., 2023, Magnitude and frequency of floods for rural streams in Georgia, South Carolina, and North Carolina, 2017-Data: U.S. Geological Survey data release, https://doi.org/10.5066/P9TSBPFS.

Summary

Reliable estimates of the magnitude and frequency of floods are an important part of the framework for hydraulic-structure design and flood-plain management. Annual peak flows measured at U.S. Geological Survey streamgages are used to compute flood-frequency estimates at those streamgages. However, flood-frequency estimates also are needed at ungaged stream locations. A process known as regionalization was used to develop regression equations to estimate the magnitude and frequency of floods at ungaged locations. This dataset contains the supporting tables and updated hydrologic region boundaries used in the 2017 flood-frequency study for Georgia, South Carolina, and North Carolina.

Summary

Reliable estimates of the magnitude and frequency of floods are an important part of the framework for hydraulic-structure design and flood-plain management. Annual peak flows measured at U.S. Geological Survey streamgages are used to compute flood-frequency estimates at those streamgages. However, flood-frequency estimates also are needed at ungaged stream locations. A process known as regionalization was used to develop regression equations to estimate the magnitude and frequency of floods at ungaged locations. This dataset contains the supporting tables and updated hydrologic region boundaries used in the 2017 flood-frequency study for Georgia, South Carolina, and North Carolina.

Contacts

Point of Contact :: Katharine R Kolb
Originator :: Katharine R Kolb, Jonathan W Musser, Toby D Feaster, Anthony J Gotvald, John C Weaver
Metadata Contact :: Katharine R Kolb
Publisher :: U.S. Geological Survey
SDC Data Owner :: South Atlantic Water Science Center
USGS Mission Area :: Water Resources
Distributor :: U.S. Geological Survey - ScienceBase

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Metadata_for_supporting_tables_and_ff_regions_for_the_GA_SC_and_NC_2017_ff_study.xml “Metadata for the supporting tables and shapefiles for the ff update” Original FGDC Metadata	View	120.52 KB	application/fgdc+xml
Table_1_All_gages.txt “List of basin characteristics considered for use in the analysis”		147.79 KB	text/plain
Table_2_Basin_characteristics_considered_for_use.txt “List of basin characteristics considered for use in the analysis”		5.93 KB	text/plain
Table_3_Flood-frequency_statistics.txt “Flood-frequency stats for streamgages in GA, SC, and NC considered for analysis”		200.04 KB	text/plain
Table_4_Excluded_gages.txt “Summary of rural streamgages in and near GA, SC, and NC excluded from study”		24.96 KB	text/plain
Table_5_Nondefault_flow_intervals.txt “Nondefault flow intervals for unregulated streamgages as used in PeakFQ program”		24.7 KB	text/plain
Table_6_Perception_thresholds_unregulated_streamgages.txt “Perception thresholds for unregulated streamgages to be used as inputs in PeakFQ”		116.55 KB	text/plain
Table_7_Perception_thresholds_regulated_streamgages.txt “Perception thresholds for regulated streamgages to be used as inputs in PeakFQ”		8.45 KB	text/plain
Table_8_Descriptions_streamgages_affected_by_regulated_flow.txt “Descriptions of streamgages in GA, SC, and NC affected by regulated flow conds”		29.13 KB	text/plain
Table_9_Values_determine_95-percent_prediction_intervals.txt “Values needed to determine 95-pct prediction intervals for regression equations”		3.88 KB	text/plain
Table_10_Peak_streamflow_draining_75-percent_above_or_below_fall_line.txt “Max peak streamflow for USGS streamgages draining 75 pct or more from fall line”		88.91 KB	text/plain
Table_11_Streamgages_considered.txt “USGS streamgages in the SE US considered for use in regional skew analysis”		83.09 KB	text/plain
flood_frequency_regions_sawsc_albers_nad83.zip “Shapefile of flood frequency region boundaries in SAWSC Albers projection”		4.68 MB	application/zip
Tables_for_GA-SC-NC_flood-frequency.xlsx “Tables stored in Excel spreadsheet format”		859.3 KB	application/vnd.openxmlformats-officedocument.spreadsheetml.sheet

Shapefile: flood_frequency_regions_sawsc_web_mercator.zip
flood_frequency_regions_sawsc_web_mercator.dbf “Shapefile of flood frequency region boundaries in Web Mercator projection”		884 Bytes
flood_frequency_regions_sawsc_web_mercator.prj “Shapefile of flood frequency region boundaries in Web Mercator projection”		425 Bytes
flood_frequency_regions_sawsc_web_mercator.shp “Shapefile of flood frequency region boundaries in Web Mercator projection”		7.07 MB
flood_frequency_regions_sawsc_web_mercator.shx “Shapefile of flood frequency region boundaries in Web Mercator projection”		148 Bytes

Related External Resources

Type: Web Application

The StreamStats application	https://streamstats.usgs.gov

Type: Related Primary Publication

Level III and Level IV Ecoregions of the Conterminous United States	https://www.epa.gov/eco-research/level-iii-and-iv-ecoregions-continental-united-states
National Land Cover Database (NLCD) 2016 Land Cover Conterminous United States	https://www.mrlc.gov/
United States Average Annual Precipitation, 1981-2010 (800m; BIL)	https://prism.oregonstate.edu/normals/
The Natural Soil Drainage Index: An Ordinal Estimate of Long-Term Soil Wetness	https://doi.org/10.2747/0272-3646.30.5.383
Feaster, T.D., Gotvald, A.J., Musser, J.W., Weaver, J.C., Kolb, K.R., Veilleux, A.G., and Wagner, D.M., 2023, Magnitude and frequency of floods for rural streams in Georgia, South Carolina, and North Carolina, 2017—Results: U.S. Geological Survey Scientific Investigations Report 2023–5006, 75 p., https://doi.org/10.3133/sir20235006.	https://doi.org/10.3133/sir20235006
Feaster, T.D., Gotvald, A.J., Musser, J.W., Weaver, J.C., and Kolb, K.R., 2023, Magnitude and frequency of floods for rural streams in Georgia, South Carolina, and North Carolina, 2017—Summary: U.S. Geological Survey Fact Sheet 2023–3011, 6 p., https://doi.org/10.3133/fs20233011.	https://doi.org/10.3133/fs20233011

Purpose

The purpose of this data release is to document the tabular information and spatial data used in the South Atlantic 2017 flood frequency study for Georgia, South Carolina, and North Carolina.

Magnitude and Frequency of Floods for Rural Streams in Georgia, South Carolina, and North Carolina, 2017-Data

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