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试卷: LEED AP ID+C 模拟试卷C[查看] The total area of a site is 26,134 sf. The surface types, runoff coefficients, and areas of the site are as follows:
Surface Runoff Coefficient Area (sf)
Asphalt Pavement 0.95 9,678;
Pervious Pavement 0.65 6,454;
Gravel 0.75 3,632;
Turf, Flat (0-1% slope) 0.25 6,370;
What amount of impervious area does the site have? A: 32% B: 72% C: 68% D: 95% 参考答案: C
本题解释: Reference: Sustainable Sites Credit, Site Selection, Stormwater Design-Quantity Control, Calculation
Imperviousness = total pervious area (sf) / total site area (sf)
Multiply each surface by the runoff coefficient to calculate the total impervious area.
Surface Runoff Coefficient Area (sf) Impervious Area (sf)
----------------------------------------------------------------------------
Asphalt Pavement 0.95 9,678 9,194
Pervious Pavement 0.65 6,454 4,195
Gravel 0.75 3,632 2,724
Turf, Flat (0-1% slope) 0.25 6,370 1,593
Total area: 26,134 sf
Total impervious area: 17,706 sf (add up all 4 columns of surfaces)
Imperviousness: 17,706 sf / 26,134 sf = 68%
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