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Track 1 Day 2: Woods


Design Considerations for Plastic Underground SWM Tanks from a Field Installation Point of View

Thursday March 21, 2019
1:30 to 2:00 pm


Amy Woods, Layfield Group


Plastic chambers used for underground stormwater retention and detention have become widely accepted across Canada. Rising land costs and increasing volume storage are necessitating underground stormwater options.

Arch chambers and modular tanks have considerable advantages to historic stormwater management ponds, but with this rapid growth and acceptance come a number of important considerations as we learn more about their design, installation and operation. Factors include high water table (buoyancy concerns), inlet/outlet sizing, maintenance, water quality, structural integrity and load factors.

This paper draws from a number of local projects in Ontario of both arch and modular-box style systems to compare, contrast, and make recommendations for future designs when using these.


Learning Objectives

1. A thorough understanding of product strengths (polymer types, testing methods).

2. What to do when faced with high groundwater tables.

3. Key design features for maintenance.


Amy Woods

Amy Woods

Amy Woods has worked in the geosynthetics industry for 18 years and been employed in the private and public sector. She is a leading expert in stormwater management and currently works for Layfield Group providing design and technical support to Owners and Engineers as well as installation support to Contractors for projects in the US and Canada.