The ‘Triple Dike Strategy’ moves away from a generic protection wall along the coast, often built by the local population itself, towards the creation of three development zones, carefully embedded in current conditions and responding to the specific future needs of every single area. The project builds a ‘200-year return period standard dike’ in most places to ensure safety protection to protect the livelihood and economy of the local community.
The first ‘outer’ dike zone increases the resiliency through wave attenuation, erosion reduction and the enhancement of sedimentation. The second ‘middle’ dike is an elevated embankment, to offer protection from impact of storm surge and the water pushed up by the waves. It is conceived not as a big wall but as a multifunctional zone: an exciting hilly park, an elevated waterfront with urban promenades, a tidal park or even a public building. The third ‘inner’ dike manages the rainwater following the principle of a sponge city. The runoff from adjacent villages and mountains is buffered, delayed and temporarily stored in rain-parks, rain-gardens, wet forests and wetlands.