Topcon MACHINE CONTROL AG System Five - Calculating the Slopes; Irregularly Shaped Fields

Surveying
Topcon AG System Five Operator’s Manual
4-8
Calculating the Slopes
The equation to find the slopes looks like this:
, where the Average Slope is
in percentages.
Using the example Distances from Figure 4-6 and the AF
solutions above, the equations look like this:
for the North–South slope
for the East–West slope
Use these slopes in your serpentine cut and fill survey.
Irregularly Shaped Fields
For irregularly shaped fields, survey the largest square or
rectangle possible for a perimeter survey. Opposite sides must
be parallel to each other, regardless of the shape of the field;
this is very important for calculating the percentage of slope.
The following example (Figure 4-7) demonstrates how to
survey the perimeter of an irregularly shaped field.
Figure 4-7. Perimeter Survey Examples for Irregularly Shaped Fields
AverageFall
Dis cetan
---------------------------------
100× AverageSlope=
0.90
1200
----------- -
100× 0.075=
0.45
900
----------
100× 0.05=
John's Shop
Marvin's Field
Earl's Field
Myrle's Field Mark's Field
Allen's Farm