Global illumination simulation technique in developing guidelines to mitigate veiling reflection in indoor swimming pools

Increasing daylight into indoor swimming pools creates a warm and sunny environment for swimmers and provides connections with the outdoor environment.  However, lifeguards report that veiling reflection from the water surface, a result of this daylighting, limits visibility into pool basins.  Thus, the veiling reflection caused by increased daylight affects the safety of swimmers. A study was conducted to develop a Design Guidelines, intended for the Hong Kong government and local professional practitioners, to reduce the occurrence of veiling reflection on water surfaces. This study is considered a pioneering Consultancy Study Project. Because visual ability is a subjective feeling and difficult to predict, and because there are currently no existing key performance index available for comparison, this study employs a novel approach to overcome these setbacks.    The Study employed both field visit and simulation technique in alleviating the veiling reflection.  RADIANCE was selected for conducting natural and artificial light simulation.  This paper focuses on the role of simulation in providing quantitative and qualitative information for the Task Force members from the government and stakeholders to determine the subjective judgments. This study has demonstrated the use of simulation technique in developing Design Guidelines and consultations throughout the engagement process. Recommendations for further study are suggested.