Abstract

One of the major water pollution sources in the fully urbanized Mimico Creek watershed is storm runoff. In order to control stormwater quality, retrofit stormwater management practices (RSWMPs) should be implemented. This chapter documents a research study which focuses on the evaluation of appropriate RSWMPs for the Mimico Creek watershed. These practices are selected based upon physical site constraints, cost-effectiveness, and the potential to be incorporated into municipal capital works and maintenance programs. Using a derived probabilistic rainfall-runoff model and a treatment train efficiency model, the cumulative reduction of runoff volume and solids loading of a series of appropriate RSWMPs are determined to be 7% and 18% respectively. In the Mimico Creek watershed, the descending order of cost-effectiveness is: (1) downspout disconnection; (2) water quality ponds; (3) stormwater exfiltration systems; and (4) oil/grit separators. Thus, the sequence of RSWMP implementation should follow the descending order of cost-effectiveness.

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