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pack material
pack material
Graded gravel and sand aggregates placed around a well screen or subsurface drain to prevent the infiltration of fine materials. See [[gravel filter]].
Authorization Path: 2.4.5.2.20.15
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Graded gravel and sand aggregates placed around a well screen or subsurface drain to prevent the infiltration of fine materials. See [[gravel filter]].
Authorization Path: 2.4.5.2.20.15