Assessing the Co-Benefits of green-blue-grey infrastructure
This chapter presents a method to include the monetary analysis of these co-benefits into a cost- benefits analysis of flood risk mitigation measures. Green-blue infrastructures in urban spaces offer several co-benefits besides flood risk reduction, such as water savings, energy savings due to less cooling usage, air quality improvement and carbon sequestration. Grey infrastructure has good performance at reducing the risk of flooding, whilst green infrastructure brings in multiple additional benefits that grey infrastructure cannot offer. Green roofs offer several benefits besides runoff reduction, such as thermal insulation of buildings, air pollution reduction and carbon sequestration, as well as longer lifespan than traditional roofs. The installation of rainwater harvesting barrels at household level is a useful measure which allows the reduction of drinking water consumption.