The Iowa flood had happen because it rained many days in a row . There was lots of stores, schools, jobs, and day cares that where closed down for a a couple of days . The water kept rising and the lakes , rivers, oceans ,and bays were filling up with water a then that's how a some of the water came out . They had to us bags of sand so there store and other stuff so the water would not enter but they put like ten on each doors . Billion of thing were damage .