The ''Planning and Urban Management Act 2004'' was passed by parliament to better plan for the urban growth of Samoa's built-up areas, with particular reference to the future urban management of Apia. The city's historical haphazard growth from village to colonial trading post to the major financial and business centre of the country has resulted in major infrastructural problems in the city. Problems of flooding are commonplace in the wet season, given the low flood-prone valley that the city is built on. In the inner-city village of Sogi, there are major shoreline pollution and effluent issues given that the village is situated on swamplands. The disparate village administrations of Apia has resulted in a lack of a unified and codified legislative approach to sewerage disposal. The relatively increase of vehicle ownership has resulted in traffic congestion in the inner city streets and the need for major projects in road-widening and traffic management. The PUMA legislation sets up the Planning Urban Management Authority to manage better the unique planning issues facing Apia's urban growth.