A boom floats across a small bay near the dam wall at Warragamba Dam in Warragamba, Australia, on Wednesday, Jan. 29, 2020. Although there have been no major impacts on drinking water yet from the intense wildfires, authorities know from experience that the risks will be elevated for years while the damaged catchment areas, including pine and eucalyptus forests, recover. (AP Photo/Rick Rycroft)
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Fabric curtains stretch across the huge Warragamba Dam to trap ash and sediment expected to wash off wildfire-scorched slopes and into the reservoir that holds 80% of untreated drinking water for the Greater Sydney area.