Exploring trade-offs among the multiple benefits of green-blue-grey infrastructure
This chapter focuses on a method to analyse the trade-offs when different benefits are pursued in stormwater infrastructure planning. Adaptation to climate change is an opportunity to improve urban conditions through the implementation of green-blue infrastructures, which provide multiple benefits besides flood mitigation. A hydrodynamic model was coupled with an evolutionary optimisation algorithm to evaluate different green-blue-grey measures combinations. An important aspect pursued with the use of this multi-criteria selection method is to improve the stakeholders’ acceptance of the measures selected. The most important cobenefits identified for this area were liveability improvement, socio-cultural benefits, water quality enhancement and environmental benefits. Blue-green infrastructure can have low effectiveness decreasing flood damage in the case of high return period rainfalls.