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Flood Frequency Analysis (May 2022)
The objective of this course is to provide modelers with the background required for practical application of techniques for flood frequency analysis. The primary references will be the "Guidelines for Determining Flood Flow Frequency" (Bulletin 17C) and EM 1110-2-1415, "Hydrologic Frequency Analysis." Lectures and workshop sessions will provide the background required to understand the statistical analysis. Knowledge gained within the lectures is applied through the use of the Hydrologic Engineering Center’s Statistical Software Package (HEC-SSP).
You will need HEC-SSP version 2.3-beta.5 or newer to open the workshop files. You can download the software here: https://www.hec.usace.army.mil/software/hec-ssp/download.aspx.
You will need HEC-HMS version 4.11-beta.14 or newer to open the workshop files. You can download the software here: https://www.hec.usace.army.mil/software/hec-hms/downloads.aspx.
PROSPECT materials page: #123 - Flood Frequency Analysis - May 2-6 2022
A zip file containing the data files for each workshop is here: FloodFrequencyAnalysis_May2022.zip
Day 1
| Topic | Link | ||
|---|---|---|---|
| lecture | L1.1 | Introduction to Probability, Statistics, and Distributions | |
| workshop | W1.2 | Within-lecture exercises | |
| workshop | W1.3 | Estimating Probability Distributions - Empirical and Normal/Lognormal | |
| lecture | L1.4 | Introduction to Block Maxima | |
| lecture | L1.5 | Time-series Analysis |
Day 2
| Topic | Link | ||
|---|---|---|---|
| lecture | L2.1 | Parametric Modeling | (optional workshop: Parametric Modeling) |
| lecture | L2.2 | EMA basics (flow ranges, perception thresholds) | |
| lecture | L2.3 | Introduction to HEC-SSP (including demo) | |
| workshop | W2.4 | Frequency Analysis in HEC-SSP | Introduction to HEC-SSP |
| lecture | L2.5 | Non-Standard Data, Outliers, Historical | |
| workshop | W2.6 | Frequency Curves with Low Outlier, Historical Information in HEC-SSP | Frequency Curves with Low Outlier and Historical Information |
Day 3
| Topic | Link | ||
|---|---|---|---|
| lecture | L3.1 | Update of Bulletin 17B to 17C | |
| lecture | L3.2 | Other Topics in 17C | video1: Lecture 3.2A - Data Influence 20210611.pdf Data Influence (12:13 video) video2: Lecture 3.2B - Effective Record Length 20210610.pdf Effective Record Length (12:08 video)) |
| workshop | W3.3 | Bulletin 17C and EMA in HEC-SSP | Bulletin 17B and Bulletin 17C |
| lecture | L3.4 | Uncertainty in Frequency Analysis | |
| workshop | W3.5 | Exercises with Uncertainty in Excel | uncertainty workshop instructions and files |
| lecture | L3.6 | Regional Skew | |
| lecture | L3.7 | Modelling Mixed Populations | |
| workshop | W3.8 | Mixed Populations in HEC-SSP | Mixed Population Analysis |
Day 4
| Topic | Link | ||
|---|---|---|---|
| lecture | L4.1 | Graphical Frequency Analysis | |
| lecture | L4.2 | Developing Unregulated Times-series | |
| lecture | L4.3 | Correlation | |
| lecture | L4.4 | Streamflow Record Extension | |
| workshop | W4.5 | Record Extension using HEC-SSP | Annual Peak Flow Record Extension |
| lecture | L4.6 | Estimating Frequency Curves without Gage Data | |
| lecture | L4.8 | Partial Duration / Peaks over Threshold |
Day 5
| Topic | Link | ||
|---|---|---|---|
| lecture | L5.1 | Precipitation Frequency to Flow Frequency with HEC-HMS | |
| workshop | W5.2 | Precipitation Frequency to Flow Frequency with HEC-HMS | Modeling Flow-Frequency Relationships using HEC-HMS |