Hovseter valley is part of comprehensive system of open spaces that are instrumental to the spatial and functional quality of Oslo. The project interpret the river valleys as a park: a material, physical space (of land and water flows to manage), a social space (of conflicts among actors/activities to solve), a cultural space (of ethic and aesthetic values to preserve), a political space (of land use rules to define), a public space (of freedom of expression to ensure). The water system is key component of the valley-park.