Abstract
This study composed the well-known criteria to design the grain size distribution of backfilling filter for groundwater monitoring well (GMW) under the sand and gravel layer. With an assumption of linear logarithmic scale distribution from D10to D90, the coefficient of uniformity Cucan be formulated for D10, D60, and D90corresponding to D15. Then, D0and D100can be obtained by linearity relationship. The method of backfilling filter deployment was then demonstrated by a practical application, which validates the procedures of existing filter design.
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