Under what conditions would you use a watertight barrier instead of well points when digging below the water table?

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Under what conditions would you use a watertight barrier instead of well points when digging below the water table?


A watertight barrier is desirable in situations where lowering of the water table would have serious detrimental effects on neighboring buildings, and is possible in situations where the bottom edge of the barrier lies in an impermeable stratum of soil below the water table.


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