Why does my dirt road turn into a wash board again not long after it is graded?

Question:
Just wondering what causes this to happen.

Answers:

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Water settles in the lower places, causing some top soil to run off and make the low spots even lower.

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The other equal contributer is vehicle suspension harmonics. Even the slightest 'low spot' will cause a vehilce's suspension to rise and fall, thus packing the road in different spots as it travels down the road. These harmonics increase with traffic speed.

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The slower the traffic, the smoother it will stay.

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