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Structural Slurry Wall and Seepage Control

DFI’s Seepage Control Committee and Slurry Wall Committee merged at the start of 2023. The mission of the committee is to be a collaborative forum to discuss and disseminate best practices for structural slurry walls and seepage control, and to advance the awareness, use and performance of structural slurry wall and seepage control technologies.


Meeok Kim, Ph.D., P.E.
Thornton Tomasetti

Meeok Kim has 19 years of experience with geostructural engineering practice. She received a Ph.D. in civil engineering from Virginia Polytechnic Institute. She serves as a geostructural engineer with Thornton Tomasetti, specializing in the analysis and design of complex below-grade systems such as deep excavations, unique foundations and tunnel access shafts in various regions of U.S. The common denominator of her experience is a system governed by soils and the structures interactions. Kim is an expert on the performance of deep foundation systems, has been involved in various types of slurry wall projects, and has designed dozens of slurry wall and LBE foundations. 


Mary Ellen Large, P.E., D.GE
Nicholson Construction Company

Mary Ellen Large brings over 30 years of foundation experience to geotechnical specialty engineering and construction contractor, Nicholson Construction Company, headquartered in Pittsburgh, Pennsylvania.  As client care manager, she strengthens relationships with current clients and develops new relationships and partnerships across several markets.  She is a professional engineer in Pennsylvania, New York and Michigan; a member of ADSC, ASCE, Chi Epsilon, DFI, Engineers Without Borders, TRB, USSD, and ASDSO; and a Diplomate of Geotechnical Engineering. She has authored/co-authored technical papers on micropiles, deep mixing, and ground anchors.  She serves as the executive director of the International Society for Micropiles (ISM). She holds a bachelor’s degree in civil engineering from the University of Maryland and a master’s degree in geotechnical engineering from Cornell University. 

Tremie concrete placement simulation using 2 tremie pipes.
Colors represent different concretes batches with very different rheological properties.
The tremie pipes were not raised for this simulation.

Upcoming Events


Guidelines for Selecting Cutoff Wall Systems

Outlines fundamental background information on the selection of cutoff walls/seepage barriers.

Cutoff Walls PowerPoint

Committee-generated base PowerPoint module introduction to cutoff walls for seepage control, including applications and construction.

Coming soon.

Structural Walls Manual Update

Task force updating Industry Practice Standards and DFI Practice Guidelines for Structural Slurry Walls (2005) to include recent advancements.

In progress.

Committee Research

Diaphragm Walls as Permanent Basement Walls in Regions of High Seismicity – outlines the requirements for extension of this practice to more common use in regions of high seismicity.

Review of U.S. Army Corps of Engineers Engineering Manual on Seepage Cutoffs for Dams and Levees

Committee conducted detailed review of the evolving text of this manual covering design and construction of seepage cutoffs.

Rough River Dam Safety Modification Phase II: New Outlet Works and Cutoff Wall Project

Presentation from June 23, 2020 by Will Ailstock, P.E., P.M.P., John Baird, P.G., Pete Booth, Ph.D., P.E., Steven Shifflett, P.E.

ICOLD – Bulletin 51 Update

DFI following International Commission on Large Dams’ (ICOLD) update of ICOLD (1985) Bulletin 51 on filling materials for watertight cutoff walls.

Lewisville VFD & Anchor Study Presentation

Lewisville Dam Safety Modification

Vertical Filter Drain & Anchor Study Program

Structural Slurry (Diaphragm) Walls PowerPoint

Committee generated base PowerPoint module introduction to structural slurry walls, including applications and construction.

Outlines basic design and construction for structural slurry walls, including an overview of types of slurry walls, design and construction considerations, detailing, quality assurance and control, and advantages and limitations.


Industry Practice Standards and DFI Practice Guidelines for Structural Slurry Walls (2005) – Highlights the major considerations in selecting structural slurry walls for temporary and permanent use in foundation construction.

Guide to Tremie Concrete for Deep Foundations (2nd Edition) – EFFC-DFI task force developed guidance for characterization related to performance, mix design process, and methods used to test fresh concrete.

Associated research report to Guide to Tremie Concrete for Deep Foundations

Guide to Support Fluids for Deep Foundations (1st Edition) – EFFC-DFI task force outlined the state of the art of support fluid practice to improve existing design, testing and practices for deep foundation elements – bored piles (drilled shafts), barrettes (LBEs) and diaphragm wall panels.

Guide to Working Platforms – EFFC-DFI guidance and resources for design and construction of safe working platforms.

USACE Grouting Manual – detailed technical guidance and criteria for civil works grouting applications.

DFI Soil Mixing Guidelines – overview of the state of practice of Deep Mixing Methods (DMM) in North America, including a guide specification for deep mixing work.

FHWA Design Manual: Deep Mixing for Embankment and Foundation Support – background on deep mixing for U.S. transportation projects and information on design and construction aspects.