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Inverted wells, in which the solid casing extends over the full depth of the permeable aquifer, but with slotted screens projecting upwards alongside the solid casing, can provide high yields in moderately transmissive aquifers for which all permeable strata are within about 30m of the non-pumping water level. The use of inverted wells has been pioneered in the Rajshahi Barind in northwest Bangladesh...
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