Kammala jumla mai zuwa: Yuni 2008 ya ga ambaliyar ruwa mafi muni a yankin Waterloo <unk> Cedar Falls da aka rubuta; sauran manyan ambaliyar ruwa sun hada da
Babbar Ambaliyar Ruwa ta 1993. Tsarin sarrafa ambaliyar ruwa da aka gina a cikin 1970s-90s ya yi aiki sosai kamar yadda aka tsara.