Wind calculation model (Heat Overlay)

The wind speed on streetlevel (1.2 meter) is calculated using a translation of the 10 meter wind speed measured at a weather station. A single reduction field per wind direction can be calculated, which in turn can be multiplied with the 10 meter wind speed to obtain the wind speed at streetlevel. The calculation model is based on the McDonald (2000) method for wind in cities. It uses the vertical areas of buildings perpendicular to the wind direction to determine in what way the wind speed is slowed down. The DPRA Heat stress report has extended this method with perpendicular vertical tree areas as well.