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drainage pipes are laid under the floor slab as well. The porous material may be either crushed stone (of uniform particle size, for maximum porosity) or a thick panel or mat of synthetic material that contains large internal passages for water. When water moves through the ground toward the basement wall, it first reaches the porous layer, where gravity pulls it rapidly downward. As the water accumulates at the base of the wall, it enters the open drainage pipe and flows by gravity either to an outlet down the slope from

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