Agriculture Reference
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The designer would then locate the 104 contour by measuring 25
feet downslope from point B. To find the location of contour 103, take the
vertical elevation difference between 104 and 103, 1.0´. See Figure 12.5-C.
S = V / H
.02 = 1 / H
H = 1 / .02 = 50 feet
The designer would then locate the 103 contour by measuring 50
feet downslope from contour 104. See Figure 12.5-C.
In Figure 12.5-D the designer has connected the 103 and 104 con-
tours that cross over the pad surface to meet their respective existing
contours outside of the pad surface. The contractor would grade the
slope following the grading plan directions depicted with the new posi-
tion of the two contours. The contractor would complete the grading fol-
lowing the contours shown in Figure 12.5-E.
creatinG a SWaLe around a LeveL Surface
to direct Surface Water fLoW aWay from
a BuiLdinG or activity area
Now let's look at the process of applying the signature grading solution,
beginning with Figure 12.6-A. The figure shows a level area delineated with
black lines where a proposed building structure is to be located. In order
to establish a working elevation for the level area, an elevation midway
between the two extreme elevations of the proposed building location must
be determined. The two points A and B on the uphill and downhill outlined
pad area represent the elevation range on the existing topography.
Establish an elevation for the pad. Assume the designer wishes to
balance cut and fill so the elevation can be midway between point B on
the uphill side and point A at the lowest downhill point from point B.
The existing elevation of point A is 103´, and the elevation of point B is
approximately 105.2´.
Pad elevation is: 105.2 - 103 = 2.2'.
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