<prompt> Qedela umusho olandelayo: Izithiyo ezivimbela amagagasi eziphepho, noma ama-floodgates, zafakwa ngemva kokuba  <response>: I-North Sea Flood ka-1953 futhi ivimbele umonakalo ovela eziphephweni noma kunoma yiluphi olunye uhlobo lwenhlekelele yemvelo olungalimaza indawo abayivikelayo. Ngokuvamile zivulekile futhi zivumela ukuhamba ngokukhululekile, kodwa zivale lapho kusongelwa isivunguvungu. Umgoqo waseThames uyisibonelo sesakhiwo esinjalo. 