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| damming-up of groundwater (by closing dams); retaining of ground water (by closing dams) | |||
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| damming-up of groundwater (by closing dams); retaining of ground water (by closing dams) | |||
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| damming-up of groundwater (by closing dams); retaining of ground water (by closing dams) | |||
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| damming-up of groundwater (by closing dams); retaining of ground water (by closing dams) | |||