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This is the first session of the 2026 Stormwater Fundamental Series and explores Road Flow Design and the point at which road flow becomes excessive or unsafe. In this session, you will learn the fundamentals of road flow hydraulics, including road capacity, flow depth, spread, hazard thresholds, and overtopping considerations. We will review typical design criteria, discuss safety impacts for vehicles and pedestrians, and work through practical examples of identifying exceedance, managing risks, and identify when additional stormwater infrastructure is required. This 60-minute session will include: • Easy-to-follow instructor-led training • Theory linked to practical real-world examples • Worked examples with step-by-step calculations