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SLOPE CALCULATION CHART
Use either of these columns but not both
Height 'C' in inches
measured with a 1 yard
horizontal edge 'A'
3
6
7.5
9
10
11
12
13
14
15
16
18
20
25
30
36
Height 'C' in millimeters
measured with a 1
metre horizontal edge
'A'
100
150
200
225
250
275
300
325
350
375
400
425
475
500
600
800
900
1000
OPERATION 6
The result of what you are measuring
Slope Angle 'D'
measured in
Degrees
4.8
5.7
8.5
9.5
11.3
11.8
12.7
14.0
15.4
15.5
16.7
17.0
18.0
18.4
19.3
19.9
20.6
21.3
21.8
22.6
23.0
24.0
25.4
26.6
29.1
31.0
34.8
38.7
39.8
42.0
45.0
Slope Angle 'D'
measured in
Grade%
8.3
10.0
15.0
16.7
20.0
20.8
22.5
25.0
27.5
27.8
30.0
30.6
32.5
33.3
35.0
36.1
37.5
38.9
40.0
41.7
42.5
44.4
47.5
50.0
55.6
60.0
69.4
80.0
83.3
90.0
100.0
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