🏚️ Homestead Mound on a River Floodplain: Gumbel Flood Return Period and Lifetime Risk (2D)

A side view of a homestead on an earthen mound beside a river that floods every spring, with a bar chart of the record of annual flood peaks that is replayed year by year. Set the typical flood level and its variability, the years of record, the mound height and slope, the planning horizon and the loss from a flood, and see the return period of the mound, the chance of being flooded over its lifetime, the fitted and the true 100-year flood and the mound height that costs the least. The return levels, the parameter fit, the likelihood fit and the lifetime risk are checked numerically, with four in-page numerical checks.