Australia’s east coast was smashed by heavy rains on Saturday, sparking dangerous flash flooding that forced the evacuation of multiple regions as the fast-moving waters unmoored houses, engulfed roads, stranded towns and cut power lines.Australia’s east coast was smashed by heavy rains on Saturday, sparking dangerous flash flooding that forced the evacuation of multiple regions as the fast-moving waters unmoored houses, engulfed roads, stranded towns and cut power lines.