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pothole |
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pothole, in geology, cylindrical pit formed in the rocky channel of a turbulent stream. It is formed and enlarged by the abrading action of pebbles and cobbles that are carried by eddies, or circular water currents that move against the main current of a stream. Potholes are most commonly found at the bottoms of eddies in rivers and in plunge pools below cataracts; sometimes potholes in a rock outcrop indicate the former site of a rapid or cataract. Potholes are often found in formerly glaciated regions where whirling columns of glacial meltwater sank well-like holes, or moulins, through the ice. Notable potholes are found in Ausable Chasm, N.Y., and Shelburne Falls, Mass. Potholes also refer to holes formed in human-made materials found in roads that are effected by natural freeze-thaw cycles or moisture (see weathering weathering, collective term for the processes by which rock at or near the earth's surface is disintegrated and decomposed by the action of atmospheric agents, water, and living things. Some of these processes are mechanical, e.g. ..... Click the link for more information. ). pothole 1. Geography a. a deep hole in limestone areas resulting from action by running water b. a circular hole in the bed of a river produced by abrasion 2. a deep hole, esp one produced in a road surface by wear or weathering How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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To repair potholes on otherwise sound gravel surfaces, fill holes with a 50/50 mixture of crushed gravel and calcium chloride, sprinkle with water and tramp to seal. Walt Sweeney, chair of the Reseda Neighborhood Council, said the city must finally pave over ``failing streets'' pockmarked with potholes. From monitoring storm drains to fixing potholes, the breadth and variety of municipal and county governance issues that GIS technologies can assist with is enduringly valuable. |
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