Next Level helps launch the 2022 STEP Webinar Series!

NLSM’s Dr. Karen Liu and James Weldon kick off the Sustainable Technologies Evaluation Program (STEP) Webinar Series 2022 on March 24, 2022 with Engineering Vegetated Roofs to Optimize Stormwater Management.  Over the course of the 21 free webinars, industry experts will focus on green stormwater infrastructure, natural heritage, and management of natural assets. 

See STEP Presentation Schedule: March – December 2022

STEP is a conservation authority-led initiative that fosters broader implementation of technologies that protect water resources and reduce our carbon footprint. The live webinar series is presented by Toronto and Region Conservation Authority (TRCA), Credit Valley Conservation (CVC), and Lake Simcoe Region Conservation Authority (LSRCA). Webinars qualify for 1 continuing development hour (CDHs).


Engineering Vegetated Roof Systems to Optimize Stormwater Management, March 24, 2022 at 12 PM ET 


Green roofs are effective source control tool with multiple co-benefits to offer. The plants and substrate absorb rainfall and reduce runoff volume. As water percolates through the substrate, peak flow is delayed and reduced. The webinar discusses the concept of retention: quantify the effectiveness of lightweight water retention layers using water-retention-to-weight ratios and demonstrate their performance with a publicly available online Green Roof Retention/Evaporation Model. The webinar will also discuss the concept of detention: illustrate its importance in stormwater management, particularly during back-to-back storms, and compare various detention technologies on the market. Finally, the new friction detention green roof is introduced, explained and compared with existing technologies. A video helps explain the concepts. At the end of the presentation, participants will be able to incorporate retention and detention into a green roof system and convert it into an effective stormwater management tool.


Karen Liu, PhD, Green Roof Specialist and  James Weldon, GRP, Technical Sales Rep







Next Level Stormwater Management logo in bold blue with logo above in blue and greenNLSM has supplied more than 2.5 M SQFT coast to coast

NLSM is Canada’s leading supplier of pre-vegetated roofs such as LiteN’Less™, Xeroflor® and StormCap™ systems. We customize to local requirements. Offer warranty& maintenance support, provide ​stormwater calculations specific to location ​and building/roof type, stormwater test data & related innovative hydrologic modeling. Email or call (416) 637-5772 Ext 1.