Photographer Sato Jun Ichi explores the architecture of Japan's flood control infrastructure in a huge collection of photographs taken over a period of 10+ years.

Japanese floodgate photo by Sato Jun'ichi --
Ibaraki, 1997

Japanese floodgate photo by Sato Jun'ichi -- Japanese floodgate photo by Sato Jun'ichi --
Tochigi, 2006 // Saitama, 2007

Japanese floodgate photo by Sato Jun'ichi --
Saitama, 1999

Japanese floodgate photo by Sato Jun'ichi --
Chiba, 1997

Japanese floodgate photo by Sato Jun'ichi --
Saitama, 1999

Japanese floodgate photo by Sato Jun'ichi --
Saitama, 2006

Japanese floodgate photo by Sato Jun'ichi -- Japanese floodgate photo by Sato Jun'ichi --
Saitama, 2006 // Saitama, 2007

Japanese floodgate photo by Sato Jun'ichi --
Ibaraki, 1998

Japanese floodgate photo by Sato Jun'ichi --
Saitama, 1998

Japanese floodgate photo by Sato Jun'ichi --
Miyagi, 1998

Visit Sato's Floodgates site for about 600 more photos. (Use the links at the top left to scroll through the 37 galleries.) There is also a book.