TM 10-4320-303-13
2.3.1.6.1 Ground Profile Construction. To construct a ground profile, first obtain a topographical map or
other source material providing accurate information concerning terrain along projected hoseline route. Then,
using this information, draw a ground profile of the hoseline route on graph paper as follows:
Figure 2-8. Ground Profile.
a. Divide horizontal base of ground profile graph, Figure 2-8, into spaces that represent uniform
distances, such as 1,000 foot intervals. However, any suitable scale can be used. The ground profile
base represents the horizontal distance the hoseline will cross.
b. Divide vertical, left-hand edge of ground profile graph into spaces that represent uniform changes in
elevation, such as 100 feet intervals. Again, any suitable scale can be used. However, the scale
must include at least the highest and lowest elevations along the hoseline route.
c. At left-hand edge of ground profile graph, mark a point that represents lead pumping station elevation.
d. Continuing across ground profile graph, mark points where significant changes in elevation occur
along hoseline route.
e. To complete ground profile, join the points marked on the ground profile graph with a straight line.
2.3.1.6.2 Pump Spacing Triangle Construction . To construct a spacing triangle, obtain a piece of paper,
transparent sheet, or cardboard thick enough to be used as a straightedge. Then prepare the pump spacing
triangle as follows:
a. Divide horizontal base of pump spacing triangle, Figure 2-9, into spaces on the same uniform scale
used to divide the ground profile graph base. Mark off spaces along pump spacing triangle base to at
least 39,000 feet.
2-32
