 Many coastal regions began to see significant coastal degradation due to human development, the Detroit River losing as great as 97% of its coastal wetland habitats.Singapore, as well, documented the disappearance of the majority of its mangrove forests, coastal reefs, and mudflat regions between 1920 and 1990 due to shoreline development.Towards the end of the 20th century, coastal engineering practices underwent a gradual transition towards incorporating the natural environment into planning considerations.