TM 5-623
Figure B-22. Medium-severity corrugation.
Figure B-21. Medium-severity corrugation.
H-Corrugation produces high-severity ride quality (fig B-23).
How to Measure:
Corrugation is measured in square feet of surface area.
Name of Distress:
Depression.
Description:
Localized pavement surface areas with elevations slightly lower than those of the
surrounding pavement are called depressions. In many instances, light depressions
are not noticeable until after a rain, when ponding water creates "birdbath" areas; on
dry pavement, depressions can be spotted by looking for stains caused by ponding
water. Depressions are created by settlement of the foundation soil or are a result of
improper construction. Depressions cause some roughness, and when filled with
water of sufficient depth, can cause hydroplaning. Sags, unlike depressions, are
abrupt drops in elevations.
Severity Levels:
Maximum depth of depression:
L-1/2 to 1 inch.
M-1 to 2 inches.
H-more than 2 inches.
See figures B-24 through B-26.
Figure B-24. Low-severity depression.
Figure B-23. High-severity corrugation.
B-9
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