21. Warsaw was on alert, but a flood wave passed through in the Vistula without causing serious damage to the capital. 22. Studies showed that a failure of this dam could lead to an high flood wave reaching the Hauptbahnhof within 2 hours. 23. Heavy weekend rains forecast for downriver in southwestern Poland and the northern Czech Republic were expected to generate a second flood wave . 24. Perhaps worst hit by the flood wave that hit early this week was the Semper Opera, adjacent to the huge Zwinger building. 25. Meanwhile, the first flood wave continued to travel down the Oder toward Germany, where officials measured rising water levels with growing concern. 26. Border Patrol helicopters were flying up and down the Rio Grande on Monday afternoon, warning residents about the flood wave , he said. 27. Prerov was hit hard by a three-meter flood wave of the Becva River, which destroyed virtually all the town's first-and second-floor apartments. 28. In Hungary, meanwhile, rescue workers were reinforcing the banks of the Danube River as a flood wave surged toward the capital, Budapest. 29. "To get from Eagle Pass to Laredo in a little over a day is fast, but that's typical for a flood wave ," 30. Heavy weekend rains forecast for upriver in southwestern Poland and the northern Czech Republic were expected to generate a second flood wave .
