For each city, complex hydrometeorological models were then developed using a whole host of local information. These included (a) climate variables such as changes in temperature, precipi- tation, sea level rise, and storm surge; (b) socio- economic and developmental factors such as land subsidence, land use, and population increases; and (c) local topographical and hydrological information. Flooding in the metropolitan areas was chosen as the key variable to assess impact. The hydrological analysis allowed determination of the area, depth, and duration of flooding under different scenarios. This information was used to identify the scale of risks and vulnerability of sec- tors, local populations,.