National Water and Wastewater Benchmarking Initiative Stormwater Task Force Fall Workshop, Richmond Hill, Ontario, Canada
by Robert J. Muir, M.A.Sc., P.Eng.
Manager, Stormwater, City of Markham
Presentation reviews the history of low impact development best management practices in Ontario, York Region and the City of Markham. Application of Analytical Probabilistic Models to assess LID performance and capacity for cost-effective design is reviewed. Lifecycle costs of distributed and centralized green infrastructure LID features are compared with conventional grey infrastructure stormwater management approaches. Normalized unit costs of various LID technologies are compared including annualized capital depreciation and operation and maintenance costs. Recent Ontario green infrastructure LID BMP implementation costs for bioswales, infiltration trenches, rain gardens and permeable pavement are summarized. City of Markham North Markham's LID servicing strategy is reviewed including impact of new development LID servicing on tax rates or stormwater utility fees.