The grade (also called slope, incline, gradient, mainfall, pitch or rise) of a physical feature, landform or constructed line refers to the tangent of the angle of that surface to the horizontal.
Keeping this in view, how do you calculate the angle of a slope?
Convert the rise and run to the same units and then divide the rise by the run. Multiply this number by 100 and you have the percentage slope. For instance, 3" rise divided by 36" run = .083 x 100 = an 8.3% slope.
What is a 2% slope?
Surface Slope Conversions
|1:48||2.0%||1/4" per foot (actually 2.083%)|
|1:20||5.0%||19/32" per foot (actually 4.95%), or 5/8" per foot (actually 5.2083%)|
|1:16||6.25%||3/4” per foot|
|1:12||8.33%||1" per foot, or 6” of rise per 6' of run|
What is slope of line?
Slope is often denoted by the letter m; there is no clear answer to the question why the letter m is used for slope, but it might be from the "m for multiple" in the equation of a straight line "y = mx + b" or "y = mx + c". The direction of a line is either increasing, decreasing, horizontal or vertical.