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Rain is one of asphalt's worst enemies. If the asphalt has not been sealed by new construction, or some sort of pavement preservation technique, there are likely cracks in the roadway. As water penetrates the asphalt, water enters the base material under the asphalt. This weakens the asphalt and reduces the load capacity of the underlayer. This causes depressions in the asphalt. As traffic drives over the weakened area, the asphalt begins to crack and a pothole is formed. This continues until the maintenance crews can get out to repair it.
