The Lower school is located in Lower Close between the East End of the Cathedral and the River Wensum in Norwich. We were commissioned to undertake a flood risk assessment (FRA) for their project to build a substantial new classroom block. As the site is adjacent to the River Wensum it places the school in flood zone 3. We drew up a specification for the topographical survey, researched local guidance and catchment flood management plans. We also obtained the flood levels from the Environment Agency. Having established the probability and severity of the potential fluvial flooding, we managed the residual risk by developing a flood evacuation plan and a sustainable drainage design.