2010 ADA Standards for Accessible Design Pocket Guide
406.2 Counter Slope.
Counter slopes of adjoining gutters and road surfaces immediately adjacent to the curb ramp shall not be steeper than 1:20. The adjacent surfaces at transitions at curb ramps to walks, gutters, and streets shall be at the same level.
Figure 406.2 Counter Slope of Surfaces Adjacent to Curb Ramps
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