Restoring the water-retaining capacity of hydro-electric dams by regular dredging and sand and silt removal is the only way left before the authorities.
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The four men died after the Gleision drift mine flooded on 15 September 2011 after a retaining wall holding back a body of water failed.
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So the watershed improvement comes in the form of retaining ponds that help farmers high in the hills harvest water.
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