01 / 4 · Practical Engineering
They can even go deep enough to reach an impermeable layer, creating a better seal that prevents water from flowing in through the bottom.
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First is the obvious protection of simply being shielded from the outside environment by a relatively impermeable and durable material.
Another option is to excavate a deep trench and fill it with grout, concrete, or a slurry of impermeable clay.
The space along the unscreened casing is usually filled with clay, which swells to create an impermeable seal so that shallow groundwater can’t travel along the annular space into the screen.
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