Director (Flood Risk and Water Quality), Mott MacDonald
Sun Yan Evans is internationally recognised as a leading expert in flood risk and water quality modelling. As Flood Risk and Water Quality Director, former Global Practice Leader, and Mott MacDonald inaugural Fellow, she has led specialist teams and delivered pioneering projects across more than 25 countries. Her work has advanced dam breach flood inundation modelling, hazard mapping, and smart solutions for assessing overtopping risks in flood defences and reservoirs. Her methodologies have shaped national and international guidelines, including those for the UK government and the World Bank. Sun Yan has published over 40 technical papers, contributed to Institution of Civil Engineers reports, and co-authored several books and guidelines. Her expertise has been called upon in public inquiries, legal cases and high-profile projects, and she has received more than 20 industry awards, including the prestigious Women in Flood and Coastal Erosion Risk Management award.
Sun Yan Evans FREng