Land Subsidence and Flooding in Bangkok In the last thirty years,the area affected by land subsidence in the Bangkok Metropolitan Region (i.e. City of Bangkok and sur-rounding region)has grown to more than 4,550 km2 in size,with maximum subsidence in many localized regions exceeding 1600 mm.the extremely flat and low-lying nature of the terrain,together with differential ground subsidence, renders the region very susceptible to excessive flooding.Unless corrective action is undertaken,the situation will continue to deteriorate,and the socioeconomic penalties will also continue to mountLand Subsidence and Flooding in Bangkok • In the last thirty years, the area affected by land subsidence in the Bangkok Metropolitan Region (i.e. City of Bangkok and sur-rounding region) has grown to more than 4,550 km2 in size, with maximum subsidence in many localized regions exceeding 1600 mm. the extremely flat and low-lying nature of the terrain, together with differential ground subsidence, renders the region very susceptible to excessive flooding. Unless corrective action is undertaken, the situation will continue to deteriorate, and the socioeconomic penalties will also continue to mount