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Magnitude and Frequency of Floods in the Alluvial Plain of the Lower Mississippi River, 2017

Scientific Investigations Report 2021-5046
Prepared in cooperation with the Mississippi Department of Transportation
By:
https://doi.org/10.3133/sir20215046

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Abstract

Annual exceedance probability flows at gaged locations and regional regression equations used to estimate annual exceedance probability flows at ungaged locations were developed by the U.S. Geological Survey, in cooperation with the Mississippi Department of Transportation, to improve flood-frequency estimates at rural streams in the alluvial plain of the lower Mississippi River. These estimates were developed using current geospatial data, analytical methods, and annual peak-flow data through September 2017 at 58 streamgages in the alluvial plain of the lower Mississippi River, including 9 in Mississippi, 35 in Arkansas, 4 in Missouri, and 10 in Louisiana. Annual exceedance probability flows presented in this report incorporate streamflow data through the 2017 water year, 32 additional years of record since the previous study in 1985 of flood magnitude and frequency in the Mississippi portion of the alluvial plain of the lower Mississippi River. Ranges for standard error of prediction, average variance of prediction, and pseudo-R2 are 45–61 percent, 0.035–0.059 (log cubic feet per second)2, and 90–94 percent, respectively.

Suggested Citation

Anderson, B.T., 2021, Magnitude and frequency of floods in the alluvial plain of the lower Mississippi River, 2017: U.S. Geological Survey Scientific Investigations Report 2021–5046, 15 p., https://doi.org/10.3133/sir20215046.

ISSN: 2328-0328 (online)

ISSN: 2328-031X (print)

Study Area

Table of Contents

  • Abstract
  • Introduction
  • Basin Characteristics and Flood-Frequency Analysis
  • Estimating Annual Exceedance Probability Flows
  • Accuracy and Limitations of Regression Equations
  • Summary and Conclusions
  • References Cited
Publication type Report
Publication Subtype USGS Numbered Series
Title Magnitude and frequency of floods in the alluvial plain of the lower Mississippi River, 2017
Series title Scientific Investigations Report
Series number 2021-5046
DOI 10.3133/sir20215046
Year Published 2021
Language English
Publisher U.S. Geological Survey
Publisher location Reston, VA
Contributing office(s) Lower Mississippi-Gulf Water Science Center
Description iv, 15 p.
Country United States
State Arkansas, Illinois, Kentucky, Louisiana, Mississippi, Missouri, Tennessee
Other Geospatial Alluvial plain of the lower Mississippi River
Online Only (Y/N) N
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