Transforming the Future of Dam Safety

A proud platinum sponsor of the ASDSO Dam Safety Conference, Gannett Fleming is thrilled to join our industry colleagues in Baltimore, Maryland!

Leaders in dam safety, we invite you to attend sessions presented by our seven dedicated thought leaders to learn how their work shapes the future of dam safety. By learning from the past, leveraging cutting-edge technology and ingenuity, and coupling it with practical experience, our team implements resilient and sustainable dam safety solutions for our governmental and private clients.

Stop by Booth #303 and meet with our experts! Learn more about how Gannett Fleming is tackling today’s difficult infrastructure and regulatory challenges, just like we did right here in the Baltimore area at the award-winning Bel Air Impoundment, pictured above.

Meet Our Presenters

Risk-Based Dam Inspection Guidelines – Montana Learns from the Oroville Dam Incident

MONDAY, SEPTEMBER 19, 2022 • 3:30 P.M.

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Amanda Hess, PE, CFM
Vice President & Manager, Hydrology & Hydraulics
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Montana Dam Safety recently updated its dam inspection guidelines to improve the quality of dam inspection reports submitted by dam owners. The update included a new risk-based approach for dam inspection requirements that was implemented to address a recommendation from a 2019 external peer review of the Montana Dam Safety Program. The external peer review focused on lessons learned from the Oroville Dam incident and highlighted the need for appropriate consideration of a “credible” dam failure event.

This presentation will review the findings from this first-in-the-nation attempt at developing risk-based inspection guidelines. Observations of the differences between the consequences of a credible dam failure scenario will be described along with a typical Emergency Action Plan dam failure scenario.

The Tale of Two Spillways

MONDAY, SEPTEMBER 19, 2022 • 3:30 P.M.

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Joseph Bell
Dams & Hydraulics Project Manager

Crab Orchard Dam and Devils Kitchen Dam are high-hazard dams owned and operated by the U.S. Fish and Wildlife Service, located on the Crab Orchard National Wildlife Refuge in southern Illinois. Although these dams are located less than six miles apart and were both built in the mid-1900s, the dams are polar opposites. The paths that lead to these projects are both unique and filled with interesting inspection findings, questions about the original design, past modifications leading to unintended consequences, and concerns over the integrity and performance of the structures.

This presentation tells the story of both spillways, illustrating prime examples of using information collected over the entire history of the structures to make risk-informed decisions to improve the performance and condition of these spillways.

What Should We Protect? Consequence Analysis That Reflects Communities' Unique Assets and Vulnerabilities

TUESDAY, SEPTEMBER 20, 2022 • 10:30 A.M.

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Katherine Sharpe, AICP, ENV SP
Principal Economist
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Kayla Briggs
GIS Analyst

Consequence analysis is a vital decision-making tool for dam safety projects, whether the goal is new structure design, existing structure rehabilitation, or decommissioning. This presentation covers key considerations for effective risk-based consequence analysis, focusing on economic and social impacts.

We’ll demonstrate how consequence analysis was strengthened by an understanding of a community’s unique assets and vulnerabilities, highlighting the importance of:

  • Social and racial equity effects analysis for disadvantaged communities.
  • Land use analysis for suburban communities undergoing rapidly expanding development.
  • Cropland and water quality analysis for a rural agriculture-dependent community.

ASDSO's Technical Knowledge Base - A New Online Resource for the Dam Safety Industry

TUESDAY, SEPTEMBER 20, 2022 • 10:30 A.M.

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Greg Richards, PE, CFM
Sr. Dams & Hydraulics Project Manager
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This presentation will provide an update on the progress of the new Technical Knowledge Base ASDSO is currently developing. A preview of the website’s format and functionality, plans for the rollout of the website, and opportunities to get involved in the long-term expansion and maintenance of this exciting resource will also be shared. Be sure to visit the Technical Knowledge Base demo booth in the exhibit hall, as well as the Dam Design and Construction Committee Meeting later in the week to learn how you can get involved.

Debris, Fire, and Ice - Unusual Hydrologic Conditions and their Impact on Dams and Floods

TUESDAY, SEPTEMBER 20, 2022 • 10:30 A.M.

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Greg Richards, PE, CFM
Sr. Dams & Hydraulics Project Manager
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Learn about new content on the ASDSO website centered around unusual hydrologic conditions and how they can intensify hydrologic events and surprise dam owners and operators. Presentations on several new case studies will be provided.

To the Tune of a Piano-Key: Analysis of Alternatives for Curtis Dam and Hydraulic Design of a Piano-Key Spillway

WEDNESDAY, SEPTEMBER 21, 2022 • 10:30 A.M.

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Seth Thompson, PE
Dams & Hydraulics Engineer
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The Scranton Gas and Water Company initially constructed the Curtis Dam in 1887 as a water supply dam. It has a spillway with a capacity of approximately 36 percent of the regulatory spillway design flood, which is the Probable Maximum Precipitation. Therefore, the Pennsylvania American Water Company initiated a rehabilitation project consisting of an alternatives analysis for increasing Curtis Dam’s discharge capacity and the design of the preferred alternative.

This presentation provides further detail into the alternatives analysis for Curtis Dam and the ultimate selection, benefits, and hydraulic design of a piano-key spillway. Seth will also discuss the piano-key weir’s hydraulic design and computational fluid dynamic (CFD) modeling.

Designing or Evaluating a Spillway: Know the Controllers of the Control Section!

WEDNESDAY, SEPTEMBER 21, 2022 • 10:30 A.M.

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Benjamin Israel-Devadason, PE, CFM
Sr. Hydrologic & Hydraulic Project Engineer
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Inadequate spillway capacity is one of the most common deficiencies at dams, and embankment dam overtopping and breaching are responsible for more than a third of recent dam failures in the U.S.

An understanding of the conditions at the spillway control section and their impacts on conveyance and overall hydraulic behavior is vital while designing a spillway. The following conditions can impact a spillway’s hydraulic performance:

  • Crest shape structural features.
  • Approach conditions.
  • Obstructions.
  • Tailwater submergence.

This presentation will provide a perspective on spillway control section conditions that are sometimes overlooked but can adversely impact spillway performance. Benjamin will use actual spillway case studies as examples and will discuss recommendations for confirming spillway performance using CFD modeling.

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