If the slide is no more than 4 feet high, the exit area should be no more than 11 inches above the protective surfacing, and when the slide is more than 4 feet high, the exit area should be between 7 and 15 inches above the protective surfacing.
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It doesn't matter exactly what it means, 20% is steeper than 10%. In surveying 20% is interpreted as 20% of a right angle (i.e. a brick wall) and so would be 18 degrees.