Underground Stormwater Control Measures


James Lenhart, PE, D.WRE; Stormwater Northwest

Thursday, August 19, 2021 - 10:00am


This presentation with focus on underground SCMs for the purposes of stormwater treatment, detention, retention and infiltration.  An overview of hydrodynamic separators, trash removal devices and filters are discussed including regulatory and verification process, as well as aspects of design, installation and operations and maintenance.  Pro and cons of different materials and configurations of products for detention, infiltration, and retention with suggestions for protecting subsurface soils.

Speaker Bio


Jim is the owner of Stormwater Northwest in Portland, Oregon. He is the former Chief Technology Officer of Contech Engineered Solutions and was the technical founder of Stormwater Management Inc which developed the StormFilter®. Jim is a named inventor of multiple US patents in the field of stormwater treatment. He has authored over 60 papers on the subject of water quality and stormwater treatment. Jim is a professional Agricultural and Environmental Engineer with over 30 years of experience. He has served as an adjunct instructor of Civil Engineering at Portland State University where he taught hydraulics and water resources engineering. Jim is an active member of the Water Environment Federation Stormwater Institute, ASTM, ASCE EWRI, and serves as a Past Chair of the Urban Water Resources Research Council. Jim holds a BS in Plant Sciences, a BS in Agricultural Engineering and MS in Water Resources Engineering. He is a Diplomate of the American Academy of Water Resources Engineers.