Agriculture Reference
In-Depth Information
99
99
100
101
102
A
100
101
102
104 .3
A
B
103
103
SHP=104 . 1
104
104
A
106
106
105
105
Figure 12.6-a
Step One: Location of proposed building
pad with elevation showing points A and B to be used in
determining the elevation of the pad (FFE)
Figure 12.6-B
Step Two
Half of 2.2' = 1.1'.
•
Adding 1.1' to 103' gives the midway elevation of the pad at 104.1'. See
Figure 12.6-B.
•
Establish the swale high point (SHP) elevation. Establishing this
elevation requires us to consider many variables, such as the distance
to locate this elevation from the building pad and the planned uses
for areas adjacent with the pad. As a rule of thumb, position the SHP
upslope from the pad area and midway, so
that surface water is divided to flow down-
hill equally to either side and away from
the pad. The SHP elevation should be lower
than the pad elevation so that surface
water coming from the back side of the pad
follows a 1% slope.
Notice the shape of contour 104 in
Figure 12.6-C. This shape characterizes the
signature of this solution. The 104 contour
wraps around the proposed building pad
and forms a swale to direct water from the
99
100
101
102
104 .3
104
103
SHP=104 . 1
104
106
105
Figure 12.6-C
Step Three
