Cities are an ever evolving complex mix of people, nature, and built structures which all have to synergize to fulfil changing societal needs. In the past, we designed, built, and operated hard infrastructure. In terms of ecology, the city needs new infrastructures, which can be more sensitive to the environment. As Mostafavi wrote: “Increased numbers of people and cities go hand in hand with a greater exploitation of the world’s limited resources. Every year, more cities are feeling the devastating impacts of this situation.”

Instead of building new ecological infrastructures in the city, the principle of reutilizing hard infrastructure is well followed in those projects. What are the benefits of this process rather than to plan completely new ecological infrastructures? Can this process of reusing be replicated in the city?

This piece of work aim to investigate some case studies of ecological urban infrastructures which reuse existed hard infrastructures.