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Scientific Investigations Report (SIR) 2004-5103 Table
of Contents
Abstract
Introduction
Purpose and Scope
Report Organization
Previous Flood-Frequency Analyses for Illinois
Flood-Peak Discharge Magnitudes and Frequencies at Gaged Sites
Data Availability
Determination of Recurrence Intervals
Estimates of Flood-Frequency Relations Based on Annual Maximum Series
Estimates of Flood-Frequency Relations Based on Partial Duration Series
Effect of Updated Flood-Frequency Analysis on At-Site Flood Quantiles Based on Annual Maximum Series
Example At-Site Frequency Curves for Annual Maximum Series and Partial Duration Series
Regional Frequency Analysis
Hydrologic Regions for Illinois
Basin Characteristics
Multiple Regression Analysis
Measurement of Explanatory Variables
Techniques for Estimating Flood-Peak Discharge Magnitudes and Frequencies
Annual Maximum Series Regional Equations for Rural, Unregulated Streams
Application of Annual Maximum Series Regional Equations
Ungaged Sites
Gaged Sites
Near Gaged Sites
Accuracy and Limitations of the Annual Maximum Series Regional Equations
Regulated and Urban Streams
Partial Duration Series Regional Equations for Rural, Unregulated Streams
Summary and Conclusions
Acknowledgments
Selected References
Glossary
Appendixes
Appendix 1: Data Preparation
Appendix 2: At-site Analysis of Flood-Peak Series
Appendix 3: Generalized Skew Coefficients for Illinois
Appendix 4: Effects of Additional Flood Records and Updated Generalized Skew Coefficients on At-Site Flood
Quantiles Based on Annual Maximum Series
Appendix 5: Determination of Basin Characteristics
Appendix 6: Hydrologic Regions for Illinois
Appendix 7: Regression Analysis
Appendix 8: Digital Data and Plots
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