The 2nd International Seminar on Dam Protection against Overtopping, or Protections 2016, was held on September 7-9, 2016 at Colorado State University in Fort Collins, Colorado. With 48 participants from North America and Europe, Protections 2016 covered a wide range of topics related to physical and numerical modeling of embankment dam overtopping performance, case studies of prototype performance under extreme flood events, and the development of innovative systems for overtopping protection. The identification of potential failure modes and the use of risk to inform overtopping protection decisions was also discussed. The technical program concluded with a discussion of the special characteristics of levees and tailings dams with respect to overtopping. This digital collection includes papers given at the seminar.

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  • Updating PMP to provide better dam and spillway design 

    Author(s):Kappel, W. D.; Hulstrand, D. M.; Muhlestein, G. A.
    Probable Maximum Precipitation (PMP) is used as input to derive the Probable Maximum Flood (PMF) for high hazard dams across the United States. The PMF is used to design high hazard dams to ensure they do not overtop and ...
  • Performance of Type III stilling basins for stepped spillways 

    Author(s):Frizell, K. W.; Svoboda, C.; Matos, J.
    Energy dissipation within hydraulic structures continues to be one of the major issues facing the designer of new or rehabilitated facilities, such as for overtopping protection of embankment dams. The energy dissipation ...
  • Model for the analysis of the structural failure of the clay core in rockfill dams due to overtopping, A 

    Author(s):Ricoy, L. F.; Toledo, M. Á.; Morán, R.
    In 2014 the Dam Safety Research Group (SERPA) of the Technical University of Madrid performed several tests to assess the behavior of rockfill dams in overtopping scenarios. A structural failure pattern of the clay core ...
  • Insights from laboratory experiments on the failure of earthen embankments at bridge-waterway abutments 

    Author(s):Ettema, R.; Ng, K. W.
    Failure of compacted, earthfill embankments during breaching combines geotechnical and hydraulic processes that interact to erode the compacted earthfill. Our paper offers insights regarding these processes as observed ...
  • Using risk to inform overtopping protection decisions 

    Author(s):Fiedler, W. R.
    The decision to implement overtopping protection as a dam safety modification alternative can be difficult. The decision involves a conscious decision to allow a dam to overtop for floods above a threshold flood. If a large ...
  • Overflow for the complete failure of the downstream shell of a rockfill dam 

    Author(s):Alves, R. M.; Toledo, M. Á.; Morán, R.
    This paper presents the results of experimental research using physical models regarding the failure of the downstream shoulder of rockfill dams caused by overtopping. The aim of this investigation is to analyze how different ...
  • Root causes of tailings dam overtopping: the economics of risk & consequence 

    Author(s):Bowker, Lindsay Newland; Chambers, David M.
    This paper examines overtopping failures of embankments at tailings impoundments from 1915-2015 and compares the severity of consequence for overtopping failures to that of other causes of failure. We find that the ...
  • Cost-effective numerical modeling for evaluation of overtopping protection systems 

    Author(s):Dababneh, Ahmed "Jemie" A.; Schwartz, Mark A.; Tastan, Erdem Onur; Edwards, Tom
    Case studies that focus on exceedance of the design flood event and the resulting overtopping conditions may be used to provide cost-effective analysis of overtopping protection systems. For this case study, conditions of ...
  • Areal-reduction factors for the Colorado Front Range and analysis of the September 2013 Colorado Storm 

    Author(s):Hulstrand, D. M.; Kappel, W. D.
    Information about extreme precipitation is of interest in hydrologic engineering applications such as dam design, river management, and rainfall-runoff-relations. These require knowledge on the spatial and temporal variability ...
  • Proposed USACE EM 1110-2-1913 erosion analysis guidance 

    Author(s):Shewbridge, S. E.
    The U.S. Army Corps of Engineers is updating EM 1110-2-1913, Design, Construction and Evaluation of Levees, including new guidance on how to conduct erosion analysis. This paper presents the two erosion models considered: ...
  • Overtopping performance of earthen dams during record flooding in Columbia, South Carolina 

    Author(s):Crookston, B.; Hepler, T. E.
    South Carolina experienced what has been described as a 1,000-year flood on October 4 and 5, 2015. Widespread rainfall from Hurricane Joaquin pounded the state's capital city, Columbia, with over 20 inches of rain recorded ...
  • Lessons learned from articulating concrete block (ACB) field installations 

    Author(s):Nadeau, J. A.
    Articulating Concrete Blocks (ACBs) have been a popular choice for high performance erosion control applications and shoreline revetments for well over 35 years and continue to grow in popularity. Estimates point to over ...
  • ACB armoring potential failure modes at dam embankments and spillways 

    Author(s):Schweiger, Paul; Shaffer, Darin; Nadeau, Jim
    Over the past 26 years numerous embankment dams and earth-cut spillways in the United States have been armored using Articulating Concrete Blocks (ACBs) to provide erosion protection. Several dams and spillways armored ...
  • Field trial for air entrained grout enriched roller compacted concrete 

    Author(s):Musselman, E. S.; Zimmer, G. J.; Young, J. R.
    Roller compacted concrete (RCC) is frequently used to armor earthen embankments for passing extreme floods and to construct gravity dams and stepped spillways. Early experience on RCC dam applications in the 1980s showed ...
  • Soil-cement for high-velocity spillway flow applications 

    Author(s):Kadrmas, Korey J.; Huzjak, Robert J.
    Although soil-cement has been used on many dams for slope erosion protection for over 50 years, soil-cement has had limited use as an overtopping liner protection for spillways. The application of soil-cement for a spillway ...
  • Performance of RCC used for overtopping protection and spillways 

    Author(s):Hansen, Kenneth D.; Fitzgerald, Thomas J.
    Roller-compacted concrete (RCC) has become the most widely accepted method for providing safe overtopping protection for embankment dams in the United States. The concept consists of placing horizontal layers of erosion ...
  • Embankment overtopping protection by riprap considering interstitial flow 

    Author(s):Wahl, Tony L.
    Riprap is commonly provided to protect embankment slopes from localized erosion caused by surface runoff during rainfall events, but it can also provide erosion protection during small overtopping events. When flow rates ...
  • Wedge-shaped blocks: a historical review 

    Author(s):Morán, R.
    The article aims to be an introduction to the history of the wedge-shaped blocks technology. As it is well known, the WSBs protection system was born in the middle of 20th century in the former Soviet Union. Even though ...
  • Pressure and velocity distributions in plunge pools 

    Author(s):Castillo, Luis G.; Carrillo, José M.
    When dam overtopping produces rectangular free jets that discharge into plunge pool basins below the dam, the pressure and velocity distributions of the flow in the plunge pool must be estimated to evaluate potential scour ...
  • Hydraulic and stability analysis of the supporting layer of wedge-shaped blocks 

    Author(s):San Mauro, J.; Larese, A.; Salazar, F.; Irazábal, J.; Morán, R.; Toledo, M. Á.
    Wedge shaped blocks (WSB) are attracting increasing attention as protection against overtopping for earth and rock-fill dams. However, there are limited examples of application and some aspects of the technology merit ...

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