 Ramba uchinyora ndima ino - Kukura kwegungwa iri remukati kwakaramba kwakagadzikana kubva muzana ramakore rechi15 zvichienda mberi nekuda kwekuvandudzwa kwemadhamu, asi apo dutu rakasundira mvura yeNorth Sea mumvura, Zuiderzee yakava keturu yemvura isingachinjiki, kazhinji ichiguma nemafashamo uye kurasikirwa nengarava. Somuenzaniso, pana November 18, 1421, rusvingo rwomugungwa rwaiva pachikumbaridzo cheZuiderzee rwakaputsika, ruchifukidza misha 72 uye ruchiuraya vanhu vanenge 10 000. Uyu waiva mafashamo eSt. Elizabeth weChipiri. 