The study of wind driven rain is an important design consideration in the built environment which requires good knowledge of wind speed, rain drop sizes and rainfall intensity. Wind driven rain or driving rain can significantly affect the durability of building. An example of Wind-Driven Rain (WDR) phenomenon is that parts of your apartment ruined by rain after a sudden downpour with your windows open.
Wind-Driven Rain (WDR) Analysis is the study of the horizontal rain phenomenon when driven by wind, resulting in rain falling into naturally ventilated spaces.
Many modern buildings are now designed with spaces for natural ventilation which whilst effectively covered are still subject to wind-driven rain. Such “Wind-Driven Rain spaces” are Aircon ledges, Balconies, Carparks, Corridors, Lobbies, Linkways, Plant Rooms, Staircases, Terraces and so on.