Upcoming events

    • 24 Jun 2021
    • 10:00 AM - 12:00 PM (MDT)
    • Online

    Underwater Inspection Technologies and Construction Techniques for Dams

    Eligible for 2 PDHs

    The average age of dam in the United States is about 60 years. With passing years, underwater structures in dams face integrity issues. These include:

    1) Cavities/cracks/defects in the dam face. These defects could impact the integrity of the dam and create a dam safety issue.

    2) Leakage / concern of operability of emergency gates and seals

    3) Grooves for lowering gates could be corroded and broken

    4) Cement lining of penstock could be compromised thus leading to water leakage

    5) Over years, silt could have been deposited in the reservoir (and Tail race channel) thus giving the dam owners a deceptive reading of water availability in reservoir

     Engineering assessments of existing dams require inspections of submerged structures such as intake structures, gates, valves, waterways, tail races and stilling basins.  Underwater manual inspections have been typically performed by divers.  Though divers have historically carried out underwater inspections, they are hampered by water depth / bottom time, differential of pressure (Delta P) potentials, and subjective observation. Remotely operated vehicles (ROVs) are gaining popularity for inspection of dams: unaffected by depth, able to be put in harm’s way, able to ‘see’ through turbidity. New technologies in underwater robotic inspections are continually being developed and upgraded.

    The first part of the webinar will focus on presenting manned diving as well as remote technologies that are available and been used successfully for performing a variety of underwater inspections. The second part will be devoted to underwater construction techniques utilized to make structural repairs to concrete structures as well as mechanical equipment.  The third part will present 3 case histories.


    Frank Immel

    Dave Gillson

    Mark Binsfeld

    Alex Kaplan

    Merry Dang

    Jared Bell

    Moderated by Dave Paul

    Register Here
    • 22 Jul 2021
    • 10:00 AM - 12:00 PM (MDT)
    • Online

    Data Acquisition and Visualization

    Eligible for 2 PDHs

    This webinar will focus on data acquisition from the field, and general considerations for efficient data collection/transfer/storage. Once that data is collected, visualization is key, and there will be discussions on how to transform that data to useable information for evaluation and communication.


    Josh Brown, Campbell Scientific

    Shaun Dustin, Dustin Engineering

    Mike Davis, Stantec 

    Moderated by Georgette Hlepas, PhD, USACE


    • 26 Aug 2021
    • 10:00 AM - 12:00 PM (MDT)
    • Online

    Instrumentation Data Analysis Tips and Tricks

    Eligible for 2 PDHs

    Focus is on how to analyze the data from instrumentation to understand project performance. It will highlight common errors and misunderstandings to be avoided as well as how to identify concerning data.


    Tony Simmonds, Geokon

    Pierre Choquet, RST Instruments, Inc.

    Mike Davis, Stantec 

    Moderated by Georgette Hlepas, PhD, USACE

    Register Here

    • 05 Oct 2021
    • 8:00 AM (MDT)
    • 07 Oct 2021
    • 5:00 PM (MDT)
    • Denver, CO


    2021 Fall Workshop Series-Denver, CO

    Oct 5-7

    Three days filled with one, two, and three day-workshops. Maximize your travel time and select ones that fit your schedule.

    3-day:  Leveraging PFMA to Perform SQRA Workshop scheduled

    Call for Workshops

     Call for Workshops for the Fall Workshop Series is open through June 11. 

    For more information and submission form

    • 21 Oct 2021
    • 10:00 AM - 12:00 PM (MDT)
    • Online

    Filter and Drain Design and Construction Details

    Eligible for 2 PDHs

    Guidance on gradation design of filters for dams is available from several Federal agencies and is widely used, although often not fully understood. However, successful design and construction of filters and drains is dependent not only on appropriate gradation design, but also on a number of practicalities – filter compaction methods and requirements; filter and drain zone dimensions and placement methods; material sources for filters and drains; filter fines content; drain pipe configurations; drain pipe materials; among others. Sources of definitive guidance information on many of these practicalities are more limited and less widely understood and applied. This presentation will cover best practices for these topics and how filter design and construction details can influence the evaluation of internal erosion risk.


    John W. France, JWF Consulting, LLC

    Moderated by Rachael Bisnett, Stantec

    Register Here

    • 18 Nov 2021
    • 10:00 AM - 12:00 PM (MST)
    • Online

    Reservoir Sedimentation and Sustainable Management

    Eligible for 2 PDHs

    Ever wonder what happens when a reservoir reaches the end of its sediment design life? Ever thought about what it would take to replace the current water storage benefits of a reservoir? The problems and solutions to reservoir sedimentation will be described in the USSD webinar on reservoir sedimentation and sustainable management. This webinar is for dam operators, consultants, and decision makers who may not have expertise in sedimentation, but who are interested in sustaining reservoir storage capacity. In 2018, the USSD Board of Directors passed a resolution that “encourages all dam owners to develop long-term reservoir sediment-management plans for the reservoirs that they own or manage by 2030.” (https://www.ussdams.org/wp-content/uploads/2018/03/Sustainable-Reservoir-Sediment-Management-Plan.pdf)

    All rivers naturally transport sediment (clay, silt, sand, and gravel) and reservoirs tend to trap this sediment, reducing water storage capacity. In addition, continued reservoir sedimentation will eventually threaten the reliable operation of dam outlets, reservoir water intakes, boat ramps and marinas. There are no early warning signs of sedimentation problems. The first symptom may be a dam outlet or water intake plugged with woody debris and sediment.

    Sustainable sediment management begins with monitoring, normally through repeat bathymetric surveys of the remaining storage capacity. Management solutions include reducing sediment yields from the upstream watershed, passing inflowing sediments through or around the reservoir, or removing previously deposited sediments from the reservoir. Economic analysis of reservoir sedimentation management needs to compare all costs and benefits associated with each alternative. Although some people assume that ignoring sedimentation is the cheapest option, the cost of sustainable sediment management can be less than the cost of upstream channel aggradation (increased groundwater and flood stage), downstream channel degradation (erosion of habitat, infrastructure, and property), diminishing reservoir storage capacity, eventual dam decommissioning, and the construction of replacement reservoir storage.

     2-hour webinar, including three 30-minute presentations, followed by a 30-minute question and answer session


    George W. Annandale, George W. Annandale, Inc.

    Gregory L. Morris, GLM Engineering

    Paul Boyd, U.S. Army Corps of Engineers

    Register Here

    • 11 Apr 2022
    • 8:30 AM (PDT)
    • 14 Apr 2022
    • 5:00 PM (PDT)
    • San Diego, CA

    Call for Abstracts

    Join USSD and colleagues in beautiful sunny San Diego at the Town and Country, for what will be the first face-to-face conference in two years!

    Technical Program Chair:   Joe Goldstein, Geosyntec

     Technical Program Vice-Chair: Ed Toms, AECOM

    Conference email:  2022conference@ussdams.org

    Submit abstract by June 27 to: https://catalyst.omnipress.com/ussd_2022

    For More Information

Past events

10 May 2021 2021 USSD Conference
22 Apr 2021 InSAR – Dam Safety Considerations and Applications
25 Mar 2021 Low-head Dams: Explained, Purposes, and Inventory
22 Mar 2021 2021 Leveraging PFMA to Perform SQRA Virtual Workshop
12 Jan 2021 Just Go with the Flow: A Phased Approach to Understanding Your Spillway
15 Dec 2020 Introduction to the Engineer of Record for Tailings Dams
09 Dec 2020 2020 Fall Workshop Series: Regional Analysis Tools for Calculating the Magnitude of Extreme Floods
08 Dec 2020 2020 Fall Workshop Series: Reclamation Consequences Estimating Methodology (RCEM)
18 Nov 2020 Seismic Thresholds for Embankment Dams & Their Return Periods
10 Nov 2020 2020 Fall Workshop Series: Instrumentation and Performance Monitoring of Dams
27 Oct 2020 2020 Fall Workshop Series: Introduction and Overview of Rock Scour
21 Oct 2020 What the f-N? Clarifying Misconceptions about Risk Plots
20 Oct 2020 Evaluating Complex Systems as Part of a Semi-Quantitative Risk Assessment
12 Oct 2020 2020 Fall Workshop Series: Leveraging PFMA to Perform SQRA Webinar
07 Oct 2020 2020 Fall Workshop Series: Understanding Potential Life Loss from Flooding - Shining a Light into the Black Box that is HEC-LifeSim
06 Oct 2020 2020 Fall Workshop Series: Introduction to Probabilistic Dam Breach Modeling
01 Oct 2020 Asphalt Core Embankment Dams (ACED) – Why, Where and How?
01 Oct 2020 2020 Fall Workshop Series
11 Sep 2020 Specialized Communication for Engineers - #3 The Business Skill of Likability
10 Sep 2020 Specialized Communication for Engineers - #2 Culture-building Conversations
09 Sep 2020 Specialized Communication for Engineers - #1 Crisis Communication
28 Aug 2020 Advanced Communication for Engineers- #3 Build Your Tribe
27 Aug 2020 Advanced Communication for Engineers- #2 Prepare for Difficult Conversations
26 Aug 2020 Advanced Communication for Engineers- #1 Executive Presence for Online Meetings
21 Aug 2020 Communication Fundamentals for Engineers- #3 Winning Presentations
20 Aug 2020 Communication Fundamentals for Engineers- #2 Be Heard!
19 Aug 2020 Communication Fundamentals for Engineers-#1 Communicate with Anyone!
02 Jun 2020 Professional Ethics Webinar
20 Apr 2020 Sponsor a Student at the Conference
20 Apr 2020 2020 USSD Conference and Exhibition
29 Oct 2019 Leveraging Potential Failure Mode Analyses to Perform Semi-Quantitative Risk Assessments
09 Jul 2019 Static Liquefaction Workshop
14 May 2019 FEMA National Dam Safety Program: Rapid Dam Break, Flood and Consequence Assessment: Preparedness, Response, Recovery and Mitigation Risk Assessments
10 Apr 2019 2019 USSD Scholarship 5K FUNds Run/Walk
10 Apr 2019 Partner in Education Donor 1 Free 5K Runner/Walker Registrations Only
08 Apr 2019 2019 USSD Conference and Exhibition
01 Jul 2018 2018 ICOLD 86th Annual Meeting Vienna
30 Apr 2018 2018 USSD Conference and Exhibition
20 Sep 2017 The Challenges of Dams in Cold Climates
14 Sep 2017 Lessons Learned from Recent Tailings Dam Failures: A Path Forward
03 Jul 2017 ICOLD 85th Annual Meeting
03 Apr 2017 USSD 2017 Annual Conference and Exhibition
26 Oct 2016 ICOLD National Committees of the Americas International Symposium on Safety of Dams
07 Sep 2016 2nd International Seminar on Dam Protection Against Overtopping
27 Jun 2016 Sixth International Symposium on Hydraulic Structures (ISHS 2016)
27 Jun 2016 International Symposium on the Mechanics of Internal Erosion for Dams and Levees

United States Society on Dams
9975 Wadsworth Pkwy., K-2,145 • Westminster, CO 80021 - USA

Copyright © 2016 USSD

Powered by Wild Apricot Membership Software