Agriculture Reference
In-Depth Information
To start, ask yourself: What do I know to apply to the formula
S = V / H ?
You know the slope is 5 percent, sloping down from point A to point B.
•
You know the horizontal distance between the two points is 35 feet.
•
What is the elevation of point B?
•
S = V / H
.05 = V / 35'
V = .05 × 35'
V = 1.65' = the difference in elevation from points A and B
Elevation of point B is 34.5 - 1.65 = 32.85'
Calculate the spot elevation of B in Figure 10.19 knowing that there
are three steps, each with a 6-inch riser, between A and B. Ask yourself:
“What do I know?”
You know there are three steps, each with a 6-inch rise.
•
3 steps × .5' = 1.5'
•
The elevation of point A is 36.5' so subtract 1.5' from this elevation to find
the elevation of point B = 34.0'
•
A
A=36.5
3 Steps with
6” rise
B
B=?
Figure 10.18
Use the information in this figure to deter-
mine the elevation of point B
Figure 10.19
Use the information in this figure to deter-
mine the elevation of point B
