Workshop on Roadway and Street Drainage
January 1986 As the temperature rises, the ice thaws and the resulting water occupies one gallon. Pressure is generated as confined water expands upon freezing. Pressures are great enough to cause concrete in bridge decks and pavements to disintegrate, pavements to heave, and earth masses to bulge. Frozen subgrades support heavy loads quite well; however, when they thaw, the materials become saturated and soft and do not serve their intended purpose. Freeze-thaw cycles can be devastating in
... devastating in cases where adequate provisions for drainage do not exist. Essentially, drainage design involves determining quantities of water that may be expected within various portions of the right of way and then sizing channels, culverts, or other structures to adequately handle the flows. Design also involves determining tbe structures necessary to support imposed earth and wheel loads. Construction naturally involves building the drainage facilities to design standards and insuring that materials meet specifications. Maintenance starts upon completion and Corrective maintenance acceptance of may be necessary the to constructed take care of overlooked during design or created during construction. facilities. situations Preventive maintenance involves work in keeping the facilities in good condition, anticipating things that can go wrong and doing something to keep it from happening, and all other chores that might be involved in keeping the system in tiptop shape. Highway agencies have a responsibility to motorists and adjoining property owners to maintain the roadways and related accessories in as good a condition as possible with resources available. Anyone, including you, could be the motorist and/or property owner who may be adversely affected by poorly maintained features.