Piqua was one of the cities that experienced severe flooding during the Great Dayton Flood of 1913. According to the United States Census Bureau, the city has a total area of 10.9 square miles (28km2), of which, 10.7 square miles (28km2) of it is land and 0.2 square miles (0.52km2) of it (2.19%) is water. Piqua (pronounced /pkw/ pik-w) is a city in Miami County, Ohio, United States. The population was 20,738 at the 2000 census. It is part of the Dayton Metropolitan Statistical Area.