<prompt> Bhala okuqhubekayo kwalesi sigaba - Ukungena okukhulu kunakho konke okuke kwaqoshwa edamini kwenzeka ngoJanuwari 2011  <response>: . futhi. Ngo-11 Januwari 2011, iWivenhoe Dam yafinyelela ezingeni layo eliphakeme kakhulu, i-191 yomthamo ojwayelekile wokugcina amanzi, njengoba ibambe amanzi ezikhukhula. Ngenxa yokuthi uyidamu elihlanganisiwe, alenzelwanga ukuba ligeleze phezu komhlathi walo noma ngaphezulu kwalo futhi kunengozi yokuthi uma amanzi egelezela phezu komhlathi, lokhu kungonakalisa udonga lodamu futhi kubangele ukuthi idamu lihluleke. Kulesi simo, izinga lamanzi kuzodingeka likhuphuke lifinyelele ku-225 womthamo. Ukuze kuvinjelwe lokhu, kwaklanywa futhi kwakhiwa idamu ukuze lifake umsele wesibili wokuphepha. Phakathi nenani eliphakeme lomcimbi wezikhukhula izinga lamanzi edamu lafinyelela ngaphansi kokuphakama kwe-spillway eyisizayo. 