Kuala Namu the newly planned Medan - North Sumatera international airport is a vital infrastructure that is not allowed to be flooded. Kuala Namu is located 3.5 km from the coast between the Serdang and ular Rivers. The lowest elevation of airport area is 6.5 m above mean sea level,meanwhile highest tide may reach 2.76 m. Design flood was calculated by using the rational method to provide recommondations for the airport planner....