2024 USSD Workshop

Reservoir Sedimentation Analysis for Pre- and Post-Wildfire using HEC-HMS

Thursday, 25 April 2024 

Seattle, WA

Training Description:

The Hydrologic Engineering Center (HEC) of the U.S. Army Corps of Engineers (USACE) is pleased to introduce the incorporation of dynamic reservoir volume reduction, specifically reservoir sedimentation analysis, into its esteemed hydrologic software, HEC-HMS. This significant upgrade empowers HEC-HMS with the capability to accurately compute long-term reservoir sedimentation, both pre- and post-wildfire events. Through sediment trap efficiency methods and dynamic reservoir volume reduction techniques, HEC-HMS now enables continuous updating of elevation area and elevation storage curves, facilitating the simulation of short- and long-term sediment deposition in reservoirs. This workshop aims to leverage these advanced capabilities within HEC-HMS to calculate reservoir volume reduction in both unburned and burned watershed areas.

 

Objectives:

  1. Gain an understanding of the dynamic reservoir volume reduction process and empirical sediment trap efficiency equations incorporated in HEC-HMS.
  2. Acquire hands-on experience in developing a comprehensive long-term reservoir sediment model, including parameter estimation, calibration, and utilization of HEC-HMS.

It is recommended that you use HEC-HMS version 4.12-beta.6 (special version for USSD Workshop) or higher version and HEC-DSSVue version 3.3.29 for the class. You do not need administrative privileges to install HEC-HMS and HEC-DSSVue. Download HEC-HMS version 4.12 beta 6 (special version for USSD Workshop) from here (HEC-HMS-4.12-beta.6-win-x64_USSD.zip). Download HEC-DSSVue version 3.3.29 from this page, https://www.hec.usace.army.mil/software/hec-dssvue/downloads.aspx. Then use 7-zip and unzip the files to the C:\Programs directory on your computer (you should have a folder named HEC-HMS-4.12-beta.6 within the C:\Programs directory). Then you can pin HEC-HMS.exe and HEC-DSSVue.exe to your taskbar and open these programs by clicking on the icons. 

 

Workshop Details:

  • Time:  Thursday, 25 April 2024, 1300 – 1700 (PDT)
  • Location: Mercer/Denny Lower Level
  • Instructor: Jang (Jay) H. Pak, Ph.D., P.E., Sr. Research Hydraulic Engineer, US Army Corps of Engineers, Hydrologic Engineering Center
  • Contact: jay.h.pak@usace.army.mil
  • Instructor Short Biography:
    Dr. Jang (Jay) Pak boasts over two decades of experience with the US Army Corps of Engineers (USACE), currently serving as a Senior Research Hydraulic Engineer at the Hydrology & Statistics Division of the Hydrologic Engineering Center (HEC). His expertise encompasses surface water hydrology, post-fire hydrology, river hydraulics, debris flow analysis, land surface erosion, and more. Dr. Pak earned his Ph.D. and Master’s degrees in Civil and Environmental Engineering from the University of Southern California, focusing his doctoral research on real-time debris prediction models integrating wildfire and subsequent storm events. He is a registered civil engineer in the state of California.


Workshop Agenda:


Time

Duration (min)

Module

Description

13:00 - 13:15

15

Admin

Introduction

13:15 - 14:30

75

Lecture

Overview of HEC-HMS's enhanced long-term dynamic Reservoir Volume Reduction Process and Sediment Trap Efficiency Equations

2024_USSD_Lecture_Reservoir Sedimentation Analysis for Pre and Post Wildfire using HEC-HMS.pptx

14:30 - 14:45

15

Break


14:45 - 16:30

105

Workshop

Applying Reservoir Volume Reduction Methods in HEC-HMS: https://www.hec.usace.army.mil/confluence/hmsdocs/hmsguides/modeling-reservoirs-in-hec-hms/applying-reservoir-volume-reduction-methods-in-hec-hms

Introduction to the Reservoir Volume Reduction Methods

Task 1: Reservoir Volume Reduction Modeling with Outflow Structure Routing Method (Elevation-Storage-Area)

Task 2: Reservoir Volume Reduction Modeling with Outflow Curve Routing Method (Elevation-Storage-Area-Discharge)

16:30 - 16:45

15

Workshop Review


16:45 - 17:00

15

Group Discussion

Participant feedback and open discussion