LEED AP with Operations and Maintenance (O+M ) Practice Exam

What defines open-grid pavement systems for achieving Heat Island Reduction - Non roof according to LEED?

1. Pavement that accommodates at least 80% impervious surfaces

2. Pavement that is less than 50% impervious with vegetation in open cells

3. Pavement that allows for stormwater runoff management

4. Pavement that can support heavy vehicle traffic

The correct answer is: Pavement that is less than 50% impervious with vegetation in open cells

Open-grid pavement systems are designed to reduce the heat island effect by allowing more natural processes like infiltration, evapotranspiration, and vegetation growth within the paving structure. The correct answer indicates that pavement should be less than 50% impervious and incorporate vegetation in open cells. This characteristic allows water to flow through the pavement and be absorbed by the soil and plants, which helps cool the surrounding environment and reduce surface temperatures. This system effectively mitigates heat buildup often associated with traditional impermeable surfaces that absorb and retain heat, thereby contributing to the urban heat island effect. By requiring a certain degree of perviousness with integrated green spaces, LEED emphasizes the importance of integrating ecological solutions into built environments. This approach aligns with sustainability goals regarding stormwater management and urban ecology. The other options do not properly align with the criteria for open-grid systems as outlined by LEED. For instance, pavements designed with high impervious coverage do not contribute to heat island reduction. Moreover, while stormwater runoff management is an important factor for urban infrastructure, it doesn’t directly define the open-grid pavement systems specified in the context of heat island reduction. Lastly, the ability to support heavy vehicle traffic isn’t a defining characteristic of open-grid systems, which prioritize permeability and