This Decision approves Hanoi Capital's water drainage master plan through 2030 with a vision toward 2050, with the following research areas: The whole water drainage system within the administrative boundary of Hanoi Capital and the expanded areas belonging to the provinces of Hoa Binh, Ha Nam, Bae Ninh and Hung Yen in the same river basin. Scope of planning for rainwater: The entire administrative land area of Hanoi city's urban center and suburban areas with direct impacts on the rainwater dra