Wind pressure is calculated according to Eq. (5.1) at reference height z_e. The definition of z_e is given in Figure 7.4. Wind pressure profile shown in Figure 7.4 is implemented in the program (the same figure is reproduced below). Note that the profiles given in the figures below is for windward pressures. A uniform profile is assumed for leeward pressure and it is always calculated at z_e = h, where h is height of the building (see Section 7.2.2).