Arakawa, Tokyo Arakawa, Tokyo Arakawa has sister-city relationships with Donaustadt in Vienna, Austria, and with Corvallis, Oregon, U.S. Domestically, it has similar relationships with nine cities, towns and villages. As of May 1, 2015, the ward has an estimated population of 208,763, and a population density of about 20,550 persons per km². The total area is 10.16 km². Arakawa is in the northeastern part of Tokyo. The shape is long and narrow, stretching from west to east. The Sumida River forms the northern boundary. The ward is surrounded by five other special wards. To the north lies Adachi; to the west, Kita;
Two Rivers Dam through it and the impoundment area behind the dam is much drier than the impoundment area behind the northern dam. The city of Roswell suffered devastating floods in 1937, 1941, and 1954. After the 1954 flood, the US Congress passed the Watershed Protection and Flood Prevention Act of 1954 which authorized the Corps of Engineers to build dams to protect Roswell from floods. The dams were completed in 1963. Two Rivers Dam The Two Rivers Dam is a dry dam in southeastern New Mexico, sixteen miles west-southwest of the city of Roswell. The dam is actually two dams separated by