Sub-Slab Drainage Systems: Design and Construction Considerations

Sub-Slab Drainage Systems: Design and Construction Considerations

Many buildings have enclosed below-grade spaces that can be exposed to permanent, temporary, or perched groundwater conditions. These groundwater elevations can fluctuate several feet, if not more, due to precipitation or tidal influences. Groundwater infiltration into these below-grade spaces, or worse, a buoyancy failure of the basement slab, can result in potentially costly problems for building owners and tenants if not handled appropriately.

Failure to adequately address high groundwater conditions can lead to the disruption of building operations, damage to interior finishes, deterioration of structural and mechanical components, and potential interior air quality issues. Unfortunately, it is not always clear who should lead the design efforts, since architects and plumbing, geotechnical, structural, and civil engineers may all be involved in the system design. In this webinar, we will focus on the design elements of sub-slab drainage systems and the multidisciplinary design considerations that are critical to successfully executing its design and construction.


After attending this webinar, participants will be able to:

  • Identify the components of sub-slab drainage systems.
  • Understand when these systems are necessary.
  • Discuss the design roles and responsibilities for these systems.
  • Review commonly encountered construction conditions.

Participants will earn 1.0 AIA CES Learning Unit (LU/HSW) for attending the live webinar. Registration is free. Please note that space is limited – email events@sgh.com to join our waitlist if the session is closed when you register. 

About the Speaker

Zachary Boswell
Zachary Boswell | Senior Consulting Engineer

Zachary is a geotechnical engineer with experience in subsurface explorations and subsequent geotechnical engineering recommendations for design and construction. His field experience includes subsurface investigations, artificial turf field investigations, subgrade preparation, excavation and replacement, well installation, soil remediation, and ground improvement. He has also overseen quality control of construction, including drilled piles, soil-cement piles, helical piles, rapid impact compaction, rammed aggregate piers, mats, tiebacks, retaining walls, temporary support of excavation, and shallow foundations. His design experience includes shallow foundations, helical anchors, modular block retaining walls, slope stability analysis, driven pile analysis, pavement quality analysis, tiebacks, timber shoring and other temporary support of excavation systems, artificial turf fields, and sub‑slab drainage system design.

Bryan Strohman
Bryan Strohman | Associate Principal

Bryan Strohman has diverse experience in geotechnical, civil, and structural engineering, including investigating, designing, and rehabilitating a variety of structures. His work experience includes mechanically stabilized earth walls, slopes, foundations, piles, excavation support systems, retaining walls, artificial turf fields, drainage systems, buried arches, box culverts, pipes, three-sided structures, bridges, and nuclear facilities. He has performed a number of investigations of mechanically stabilized earth wall failures, foundations, and damage to underground structures. His technical expertise is focused on heavy civil structures, soil behavior, and drainage systems. His broad experience has also involved numerous soil-structure interaction analyses. He is an active participant in the American Society of Civil Engineers’ Embankments, Dams, and Slopes Committee, and currently serves as the committee secretary. He is also a member of the Deep Foundations Institute’s Codes and Standards Committee and the Boston Society of Civil Engineers Section Geo-Institute Technical Group.