Snorkel AB46JE - Manual (Page 47)

Chapter 9 – Operation
AB46JE – 0260072 43
Length
Height
Length
Height
% of Grade = x 100
Figure 9.5 – Percent Grade Formula
The grade can be measured with an inclinometer or by
using a tape measure, a level, and a straight 2x4. If us-
ing an inclinometer, refer to the conversion diagram if
necessary.
To measure the grade without an inclinometer, use the
following procedure.
1. With the 2x4 laying parallel with the slope, lay the
level lengthwise on the 2x4.
2. Holding the downhill end, raise the 2x4 until the
level indicates that the board is level (refer to Figure
9.6).
Figure 9.6 – Percent Grade Calculation
3. Use the tape measure to measure the distance
(height) from the end of the 2x4 to the ground. Record
the height distance.
4. Measure the length of the 2x4 and record this mea-
surement.
5. Use the formula in Figure 9.5 to calculate the percent
of the grade.
Length
Height
Ground Slope
Length
Height
Ground Slope
Percent of
Grade
Angle of Slope
in Degrees
45°
40°
30°
35°
25°
20°
15°
10°
5°
5%
10%
15%
20%
25%
30%
35%
40%
45%
50%
55%
60%
65%
70%
75%
80%
85%
90%
95%
100%
0
Figure 9.4 – Slope Percent/Degree Conversion