This 2.5 year study evaluated at a catchment scale, the hydrologic benefits of widespread application of two types of lot level stormwater management practices in a newly constructed residential development in Markham, Ontario: Increased topsoil depth (ITD); and Rear yard infiltration trenches (RYIT) with grass swale pretreatment.

Runoff reduction benefits were examined relative to a control catchment of conventional design (standard topsoil depth and no rear yard infiltration trenches) and similar slope, soil type and impervious cover as the catchments where increased topsoil depth and rear yard infiltration trenches were implemented.

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