Every single place on-line that I can find that describes a slope ratio
defines it as the ratio of drop to horizontal distance (rise-to-run
ratio), and then gives an example of the exact opposite--for example, a
2:1 slope ratio is illustrated by a one foot rise for a two-foot run. Is
it that there was a mistake in one landscaping textbook 50 years ago
that got perpetuated, so that now everyone in the landscaping business
In civil engineering, earth slopes are described as 1-1/2:1, 2:1, 3/1, 4:1,
etc. This means one foot of rise in the stated number of feet. Perhaps
there has been a mistaken use of terminology from one field (earthwork
construction, for example) used in another field such as carpentry where
other expressions are customary.
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