• 20 Jul 2020

    Pavement irrigation to cool down waiting areas in Nice

    The Covenant signatory Nice Côte d'Azur(France) put in place an innovative adaptation measure first invented in Japan to reduce the effect of Urban Heat Island for pedestrian. A new case study is available in our library!

    The Urban Heat Island phenomenon, higher temperatures in urban areas compared to the ones in their surroundings, is caused by human activity in cities. Mediterranean cities such as Nice, particularly sensitive to extreme heat, face even higher increases of temperatures, which have been exacerbated by climate change. Nice Côte d’Azur has thus implemented a project to improve the thermal comfort of citizens in public spaces and limit the heat island effect through the wetting of pavements in a multi-modal transport station.

    Modelling studies were first conducted to target areas of discomfort and identify the appropriate solutions. These studies identified that waiting areas for pedestrians in stations and at stops were a key issue, and where more traditional solutions such as tree planting and other nature based solutions could not be implemented, irrigating pavements was a possible solution.

    The city used two different systems: one irrigates the ground from below, thanks to a permeable paving made from seashells. The pavestones are arranged on a mortar setting bed and water is injected into the mortar using pipes with small holes in them that water slowly drips through.The other is a spray humidification system that sprays water evenly on the surface of bus tracks to wash the surface while cooling the area.

    Developing a pavement wetting system in waiting areas for pedestrians mitigated the urban heat island effect, stimulated the use of public transport, reduced health impacts of heat on vulnerable groups, and increased economic activities in the area.

    Find out more in our latest case study - available also in French.