05
OF ENGINEERING F0RMULÆ.
Earthwork Tables A and B.
The first set of tables (A) is applicable to the
English practice, in which the height is given in
feet, the length in Gunter’s chain of 66 feet, and
the contents in cubic yards. The second set (B)
is applicable to any measure when the length,
height, and contents are all of the same unit.
Quantities of earthwork may be calculated with
sufficient accuracy for all practical purposes by
these tables, unless the heights at each end of the
length differ greatly when a correction fur the
slopes is necessary.
If II and h be the tabular numbers for the slopes
at each end of a length respectively, the cubic
contents = x (H + Å). (For values of x, see
table.) On sidelong ground where the areas are
taken out from cross sections, if A and a be the
areas of a slope at each end respectively, the cubic
contents of the slope = y (A + a). (For values
of y, see table.)
Values of x to bb used fob Slopes only.
50 I 2.5 I
40 f-4959 ~i -5 J
30 I -4804 { '4933 | '5 |___
’ 20 i -44«3 I *4667 I -4872 | -5 |
~ 1Ö I -3973 } -Hl 8 I -4333 I r466f I -5 j
å I -3663 I -a742_| -3870 j -4118 | -4667 |' '5
’ 0~ J 3333 j •33.3.? I •3333 | -.3333 | -3333 | -3333
Feet [ 50 ! 40 j 30 j 20 10 I