A second dam has burst in south-western Poland following heavy rains, authorities said on Sunday. The dam in Stronie Śląski, in the Lower Silesia region, gave way and water on the Biała Lądecka river is now flowing unimpeded into the Nysa Kłodzka catchment area, a metrological network said. The town of Stronie Śląski is located in the Kłodzko Valley on Poland’s border with the Czech Republic. Police have sent a rescue helicopter to the area to bring people stranded by the water to safety. Army soldiers are also on the scene. On Saturday evening, a dam in the nearby mountain village of Międzygó…