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Review of urban flood risk mapping methods to guide risk reduction strategies. Tiered vulnerability assessment for urban storm (overland pluvial and sewer), sanitary / wastewater and riverine systems is illustrated from "Flood Plain to Floor Drain", consistent with the author's design standards guideline for best practices and projects in existing communities. Example risk mapping / tiered vulnerability evaluations in Markham, Ontario and Stratford, Ontario are shown emphasizing where simple and intermediate risk assessment can guide no-regret, practically deployed policies and programs to reduce urban flood risk, and there advanced risk assessment can guide minor and major capital projects as part of more comprehensive studies in high risk areas that warrant infrastructure investments to lower flood damages in specific local systems. Presentation was made as part of the Ontario Urban Flooding Collaborative organized by Green Communities Canada.