Aussiebear
07-18-2022, 01:06 AM
Just recently I've been tasked with calculating slope while conducting dozer operations. Now I understand that 1° slope equals 1m rise in 100m distance, but Mother Nature unkindly does not produce uniform slopes. How do I write this as a "Slope percentage"? Various you tube videos suggest that inverse Tan (Rise / Distance) but I don't have a trig calculator to test this. Excel doesn't seem to provide an Inverse Tan function either that I can find.
A recently downloaded trig calculator when run with the following data 2m Rise, 50m Distance suggests 2.3° for slope, but also suggests the Hypotenuse is 50.0 which I think is incorrect ( unless the value is less than 50.049 and it rounds down).
The only other way I have arrived at is the following formula =((Rise/Distance)*100)/1.76 which seems to work but I am unable to accurately confirm the results with certainty. The 1.76 figure is something that I found quite some time ago to convert Degrees to percentage but I'm also uncertain if this is accurate since Google searches suggest also 1.75.
Since trig calculations seem to work on small distances ( Engineers seems thrive on the damn stuff), can anyone find a way to test if my formula is accurate?
Example: Rise 220m, Distance 1700m. The trig calculator suggests 7.4° and my formula also suggests 7.4° when simplifying the result to one decimal place. Am I on the right track?
A recently downloaded trig calculator when run with the following data 2m Rise, 50m Distance suggests 2.3° for slope, but also suggests the Hypotenuse is 50.0 which I think is incorrect ( unless the value is less than 50.049 and it rounds down).
The only other way I have arrived at is the following formula =((Rise/Distance)*100)/1.76 which seems to work but I am unable to accurately confirm the results with certainty. The 1.76 figure is something that I found quite some time ago to convert Degrees to percentage but I'm also uncertain if this is accurate since Google searches suggest also 1.75.
Since trig calculations seem to work on small distances ( Engineers seems thrive on the damn stuff), can anyone find a way to test if my formula is accurate?
Example: Rise 220m, Distance 1700m. The trig calculator suggests 7.4° and my formula also suggests 7.4° when simplifying the result to one decimal place. Am I on the right track?