TABLE OF CONTENTS - The Professional Green Building Council

Theme B: Creating a livable, healthy and environmentally viable citiestopography and being remote from weather stations, wind tunnel simulation testbecomes more appropriate.Figure 1:Wind rose Diagram + Wind Tunnel Test2.2 Air Ventilation Assessment (AVA)Air ventilation assessment is an indicator to relate the wind availability of a cityand the urban geometry, and to assess the built form’s capability to optimize theavailable wind. This indicator addresses what minimum wind environment, and inwhat form, is needed to guide design and planning so as to achieve a better windpenetration into, and hence, air ventilation of the city, especially at the pedestrianlevel. It is represented by Wind Velocity Ratio –VR w =V pV ∞V ∞ is the wind velocity at the top of the wind boundary layer not affected by the groundroughness, buildings and local site features483