. Field service notes for : incorporating amendments . The closer the contour lines the steeper the slope. The vertical distance of level between twoadjacent contours is the vertical interval, or VI,always expressed in feet. Contours at 50 feet VI means that two suc-cessive contours are separated by a vertical intervalOf 50 feet. The distance on the map between two adjacentcontours is called the horizontal equivalent, orHE, usually expressed in yards. Form lines = approximate 8i Slopes and Gradients, Expressed— (j) In degrees.(2) As a gradient or road with a ruli
. Field service notes for : incorporating amendments . The closer the contour lines the steeper the slope. The vertical distance of level between twoadjacent contours is the vertical interval, or VI,always expressed in feet. Contours at 50 feet VI means that two suc-cessive contours are separated by a vertical intervalOf 50 feet. The distance on the map between two adjacentcontours is called the horizontal equivalent, orHE, usually expressed in yards. Form lines = approximate 8i Slopes and Gradients, Expressed— (j) In degrees.(2) As a gradient or road with a ruling gradient of 1/30 meansthat no part, of the road is steeper than 1 in 30. To Convert Slopes to Gradients. A slope of i° = a gradient of 1 in 57*3, or about1 in 60. Divide 60 by the denominator of the gradient,— A gradient of g1^ = a slope of 2°.A slope of 5° = a gradient of 1 in = gradient. HE (in feet) — A = 10 = 40 feet. Distance A—B = 90 (VI) = i/3- 90 (HE) .*. Slope is 1 in 3. 8
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