HEC-HMS with Application to Dam Safety: Agenda

Classes will begin at 10:00 am and end at 7:00 pm ET, with an hour for lunch and breaks in the morning and afternoon.

March 23, 2021

  • Welcome and Introductions
  • Lesson 1:  Fundamental Processes in Hydrology (Art)
    • This lesson will discuss the basics of rainfall-runoff calculations.
  • Lesson 2:  History of Hydrologic Design for Dams and Intro to HEC-HMS (Amanda)
    • This lesson will provide a brief background on the history of hydrologic design and introduce the capabilities and user interface of the software.  
  • Workshop 1:  Using HEC-HMS
    • Participants will follow along with the instructors in developing a simple HEC-HMS project, making a run, and looking at the results.
  • Lesson 3:  Basin Rainfall – Sources of Data (Art)
    • This lesson will identify the elements of a storm and provide guidance on where precipitation data can be obtained for both historical and hypothetical events.
  • Workshop 2:  Acquiring Rainfall Data
    • Participants will practice obtaining precipitation data from a variety of sources and will develop a simple HEC-HMS watershed model.
  • Lesson 4:  Temporal Distributions of Rainfall – Application to HMS (Amanda)
    • This lesson will focus on temporal distributions of hypothetical events.  Methods of entering precipitation data in HEC-HMS will also be discussed.  
  • Workshop 3:  Analyzing Storm Data
    • Using the base model from Workshop 2 as a starting point, the participants will explore the effects of various temporal precipitation distributions.

 March 24, 2021

  • Lesson 5:  Methods for Estimating Loss Rates (Art)
    • This lesson will cover the role of loss rates in calculating runoff volume using HEC-HMS. Common loss rate methodologies will be described.  
  • Lesson 6:  Using NRCS CN for Estimating Losses (Amanda)
    • The NRCS CN loss rate method is a very commonly used loss rate methodology.  It relies on data published by the NRCS.  This lecture will describe how the NRCS data was developed, the uncertainty associated with it, and how it can be used to estimate rainfall losses. 
  • Lesson 7:  HEC-DSS (Amanda – mini-lesson)
    • This short lesson will provide an overview of the capabilities of HEC-DSS in storing data and HEC-DSSVue in displaying data.  
  • Workshop 4:  Loss Rates
    • Participants will develop a HEC-HMS project and explore the sensitivity of changes in loss rate parameters.
  • Lesson 8:  Hydrologic Modeling for Gaged and Ungaged Watersheds (Art)
    • This lesson will discuss unit hydrographs and modeling approaches for gaged and ungaged watersheds.  Synthetic unit hydrographs will be summarized.
  • Workshop 5:  Computing Hydrographs Using Synthetic Unit Hydrographs
    • Participants will compare several unit hydrograph methods using a partially-completed model provided with the course materials.
  • Lesson 9:  Estimating Timing Parameters (Amanda-mini-lesson)
    • This short lesson will review methods for developing estimates of timing parameters used in various synthetic unit hydrographs.
  • Lesson 10:  Frequency Analysis (Art)
    • This lesson will cover methods for obtaining flood frequency estimates for gaged and ungaged watersheds.
  • Workshop 6:  Frequency Analysis with PEAKFQ 
    • Participants can either work on their own or follow along with the instructors to obtain estimates of frequency floods for a watershed using PEAKFQ.

March 25, 2021

  • Lesson 11:  The Basics of Calibration (Amanda – mini-lesson)
    • This lesson will discuss model calibration and validation including data requirements and sensitivity analyses.  The concept of quasi-calibration will be introduced.
  • Lesson 12:  Case Study – Chambersburg (Art– mini-lesson)
    • The instructors will step through a case study of a watershed analysis and describe methods used to evaluate the validity of the results.
  • Lesson 13:  Channel Routing (Art)
    • This lesson will discuss methods of channel routing.
  • Workshop 7:  Channel Routing
    • Participants will use a partially-completed model to explore channel routing methods.  
  • Lesson 14:  Reservoir Routing (Amanda)
    • This lesson will discuss methods for modeling reservoirs, lakes, ponds, dams and other attenuating structures.  Differences in methodologies between hydraulic routing methods and hydrologic routing methods will be covered.  
  • Workshop 8:  Reservoir Analysis for Overtopping
    • Participants will use HEC-HMS evaluate the spillway adequacy of a dam.
  • Lesson 15:  Uncertainty in Hydrologic Modeling (Amanda)
    • This lesson will cover sources of uncertainty in hydrologic modeling as well as the importance of this uncertainty.   
  • Workshop 9:  Comprehensive Application
    • This workshop allows students to apply the concepts covered during the course.  The workshop can be completed in class during this workshop time, in class as an extra assignment when complete with other workshops, or after class as additional practice.  
  • Questions and Answers
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