Kammala jumla mai zuwa: Ban da yunwa da annoba, wasu daga cikin munanan bala'o'i a tarihi (wanda aka auna ta hanyar mutuwar) sun kasance ambaliyar kogin, musamman a Kogin Yellow a China <unk> duba jerin ambaliyar ruwa mafi muni. Mafi muni daga cikin wadannan, da kuma mafi munin bala'i na halitta (ban da yunwa da annoba) sune
Ambaliyar ruwa a China a shekarar 1931, an kiyasta cewa ta kashe miliyoyin mutane. Wannan ya riga ya faru da ambaliyar Ruwa Yellow ta 1887, wanda ya kashe kusan mutane miliyan, kuma shine bala'i na biyu mafi muni a tarihi.