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Define the Phreatic Line and Phreatic Zone
Phreatic Line: In an unconfined aquifer, it represents the water table.
Phreatic Zone: In an unconfined aquifer, it is located below the water table where the aquifer material is saturated - all voids are filled with water.
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Sometimes side of concrete bridges is observed to turn black in colour . What is the main reason being for the phenomenon ?
limitation in using with bitumen as watertight material
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