Slope ratios
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 is confused? |
Slope ratios
|
Slope ratios
In article ,
Harlan Messinger wrote: 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 is confused? That's as good a hypothesis as any. I know my landscaper is confused about the topic, and consults me on every new job design. Something about math eludes people. Back in the stone age when I took a research class in college, the story was told of a fairly prominent researcher who had sought at length in vain for a particular statistic. It was the only piece of data lacking in his otherwise complete paper. So, he made up a number. Fifty years later, still considered a definitive authority on the subject matter, his fictitious number was still being quoted by others. |
Slope ratios
"Harlan Messinger" wrote in message ... 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 is confused? 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. SJF |
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