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*To prevent erosion of soils beneath the stone and the migration of the stone into the soil, the stone bed should be underlain by a drainage [[Geotextiles|geotextile]].
*To prevent erosion of soils beneath the stone and the migration of the stone into the soil, the stone bed should be underlain by a drainage [[Geotextiles|geotextile]].
<gallery mode=Packed>
File:Geogrid and geotextile.jpg
File:Geogrid and geotextile.jpg
</gallery>
</gallery>