Slope & ContourMeasure the gap between contours on your survey and get the real slope in %, degrees and 1 in n, the true length along the ground, and how far apart contours must be for any slope you want to design.

Measure on the print, square to the contours. "Contours crossed" is how many intervals the measured line climbs (1 = between two neighbouring contours).

Target slope gives the contour spacing you must draw on the grading plan. 8.33% = 1 in 12, the ADA 2010 ramp limit.