21.   Summer downpours frequently trigger deadly floods in China, often because centuries of overfarming have stripped hillsides of vegetation that would absorb rain water.

22.   The battle triggered a flood of Bosnian Muslim refugees from the two towns.

23.   The Aragon regional government argued that the kind of torrential rainfall that triggered the flood is impossible to predict, and denied planners could have foreseen the risk.

24.   The battle triggered a flood of refugees from the two towns.

25.   The Aragon regional government argued that the kind of torrential rainfall that triggered the flood is impossible to predict, and denied that planners could have foreseen the risk.

26.   The battle triggered a flood of Muslim refugees from the two towns.

27.   The floods were triggered by the melting of snow, which caused the Lena and Aldan Rivers to overflow.

28.   The floods were triggered by the springtime snow melt in the region, which caused the major Siberian river, the Lena, and the River Aldan to overflow.

29.   The storm aksi triggered floods in low-lying areas near the coast.

30.   The United Nations has warned that increasing tension in the region could trigger a flood of refugees.