LEED-AP-BD+C Exam Dumps : LEED AP Building Design + Construction (LEED AP BD+C)

The assembly U-value of a building envelope component is the overall rate of heat transfer through that component, taking into account the different materials and layers that make up the component. For example, the assembly U-value of a wall would include the effects of the insulation, framing, sheathing, cladding, air films, etc. The assembly U-value is different from the material U-value, which is the rate of heat transfer through a single material. For example, the material U-value of steel is much higher than the material U-value of glass, but the assembly U-value of a steel-framed window may be lower than the assembly U-value of a glass curtain wall, depending on the other factors involved.

The average flush rate for a dual flush toilet is calculated by weighting the high and low flush rates according to the frequency of use. According to the LEED Reference Guide for Building Design and Construction1, the frequency of use for male and female occupants is assumed to be as follows:

Male full flush: 1 time per day

Female full flush: 1 time per day

Male low flush: 2 times per day

Female low flush: 2 times per day

Therefore, the average flush rate for a dual flush toilet with a high flush rate of 1.6 gpf (6 lpf) and a low flush rate of 1.05 gpf (4 lpf) is:

6(1×1.6)+(1×1.6)+(2×1.05)+(2×1.05)​=1.19 gpf(4.5 lpf)

Green Infrastructure (GI) and Low-Impact Development (LID) rainwater management strategies improve upon the conventional approach for rainwater management by replicating a site’s natural hydrology. GI and LID are design approaches that use various practices to mimic the natural water cycle and reduce the negative impacts of development on the environment. They aim to preserve, restore, or create natural features that can capture, infiltrate, evaporate, or reuse rainwater on site, rather than conveying it to a centralized stormwater system. By doing so, they can reduce runoff volume and peak flow, improve water quality, enhance groundwater recharge, increase biodiversity, and create more attractive and resilient landscapes. Therefore, option A is the correct answer. The other options are not true for GI and LID strategies. Discharging rainwater at a faster rate (option B) would increase the risk of flooding, erosion, and pollution downstream. Increasing a site’s impervious surface (option C) would reduce the infiltration and evaporation of rainwater and increase runoff and heat island effects. Providing a greater volume of rainwater detention (option D) would not necessarily improve the site’s hydrology, as detention is only a temporary storage of rainwater that does not address the runoff quality or quantity issues. For more information on GI and LID rainwater management strategies, you can refer to the LEED v4 Reference Guide for Building Design and Construction1 or the Green CE course on Rainwater Management for LEED v4.1 Projects2.