Hardscape & Grading第 58 / 100 题
A paved surface should be sloped for drainage at about what minimum cross slope?
a.About 1 to 2 percent
b.0 percent (dead level)
c.10 to 15 percent
d.Sloped toward the house
解析
Paved surfaces such as patios and walkways are typically sloped about 1 to 2 percent, roughly 1/8 to 1/4 inch per foot, to shed water without being noticeably tilted. A dead-level surface ponds water, while too steep a slope is uncomfortable and unsafe. Water should always be directed away from structures.
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