Johannis de Rijke

In September 1873, De Rijke arrived in Japan together with Van Doorn and George Arnold Escher. During the next thirty years, these three civil engineers developed a range of flood control and water management projects.[5] He improved the ports of Tokyo, Yokohama, Nagasaki, Ujina (Hiroshima), Hakata (Fukuoka),[4] Mikuni (Sakai), and Niigata.[3] His breakwater at the port of Yokkaichi is recognized by the Japanese government as an Important Cultural Property.

De Rijke also developed plans to improve riparian zones of several Japanese rivers. Notably, his groundwork and planning caused the separation of the Kiso River, Nagara River and Ibi River near Nagoya, also known as the Kiso Three Rivers (木曽三川, Kiso Sansen).[6] Importantly, De Rijke was responsible for the construction of a tunnel channel from Lake Biwa to Kyoto.[3] He is also credited with building the Tokyo Kanda River sewer network.[1] ーーーーーーーーーーーーーーーーーーーーーーーーーーーーーーーーーーーーーーーーーーーーーーーー Elementary schools in Aichi Prefecture conduct a tour of circles when they become third graders. At that time, you can see the actual rings at Kiso Sansen Park and learn the secret story and history of the formation of the rings. People outside the prefecture know that the ring is meant to prevent the flooding of the river, but they do not know what kind of hardships and processes it took to create it. It was not easy to make a wheel, and it took a lot of sacrifice, labor, and time to make it. That's why I want people who live in the details of the process and the surroundings to know their efforts and history, and to pass them on to future generations. ーーーーーーーーーーーーーーーーーーーーーーーーーーーーーーーーーーーーーーーーーーーーーーーーー After 1891, De Rijke was appointed an Imperial officer of the Meiji Home Ministry, where he rose to the position of Vice Minister in this Japanese government bureaucracy.[7] He later served as an instructor in the Imperial College of Engineering.

In 1876, De Rijke traveled to Shanghai to help develop plans to improve the navigability of Huangpu river, a tributary of Yangtze River, which is important to Shanghai's international trade.[8]

In 1897, he returned to Shanghai for a second report of Huangpu river. In 1901, he returned to China to participate in the Yellow River flood control project.[1]

In June 1906, he was officially appointed as the first chief engineer of the Whangpoo Conservancy Board. Before his return to the Netherlands in 1909, he carried out a number of riverway projects on Huangpu river, including the Wusong Jetty (built by the Huangpu's mouth) and the Gaoqiao new channel. His work successfully eliminated most of the shoals and achieved the preliminary goal of Huangpu channel improvement: the lowest water depth at Huangpu's mouth has been deepened from 15 ft to 21 ft, and in the Gaoqiao new channel from 2–3 ft to 19 ft.[9]