TM 5-820-3/AFM 88-5, Chap. 3
b. A number of box drains similar to those
the drain wall while the thickened edge is restrained
shown in figure 3-4 have failed structurally at sev-
from moving away from the drain, and the
eral installations, Causes of failure are the inability
infiltration of detritus into joints. Figure 3-5
of the drain walls to resist the movement of the
indicates a successful box drain in use at Langley
abutting pavement under seasonal expansion and
Air Force Base. The design provides for the top of
contraction, the general tendency of the slope
the box drain wall to terminate at the bottom of the
pavement to make an expansion movement toward
abutting pavement. A typical drain cover is a
3-6
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