section. This value is the total end area of the cross-
sectional view.
To compute the amount of cubic yards between
two cross sections, use the following equation:
(A1 + A2) x 1.85 x Distance= Cubic yards
A1 = Area of one end cross section
A2 = Area of other end of cross section
1.85 = Constant factor
D = Distance between two end areas that must be
changed to a decimal form; for example, 250
feet = 2.50, 125 feet= 1.25,75 feet= .75, and
so forth
To compute the equation, take the area of one end
section (cross section) plus the area of the other end
and multiply the sum of the two areas by a constant
factor of 1.85. This value should now be multiplied by
the distance between the two end areas to determine
the number of cubic yards. (See fig. 15-21.)
CONSTRUCTION (GRADE) STAKES
Grade work is the plotting of irregularities of the
ground (making cuts or fills) to a definite limit of
grade (elevation) and alignment. This is performed by
reading information placed on construction (grade)
stakes.
Figure 15-20.—Area of trapezoid.
Figure 15-21.—Computing cubic yards of cross sections.
15-15
