Luis Bonet Linuesa
Chief Engineer Demarcation of State Highways in Catalonia
Ministerio de Fomento

ABSTRACT
The delta of the Llobregat River, next to the conurbation of Barcelona, ​​must accommodate the extensions of the port and airport of the city, the new road and rail links and the new treatment plant of Bajo Llobregat. Very important infrastructure in a relatively small space. In addition, to make them possible, it was necessary to divert the Llobregat River in its final section. It is necessary, given the natural and human environment on which it acts and the size of the infrastructure built, that they are compatible with the environment. All this requires close coordination between the different competent authorities to make compatible in space and time the construction of various infrastructure, while getting the environmental impact is within the allowable limits.

KEYWORDS
Environment, Infrastructures, River, Administrations, Coordination.