[2][3] Prior to 1946, the arable land west of Pyongyang alongside the river (the flood plain), down to where it entered the Taedong River was subject to annual flooding.

[4] The farmers there annually rebuilt their homes after the floods subsided, so the construction was, perforce, of a temporary nature, huts and even pit-houses.

[4][7] It commemorates Kim Il Sung's 1945 visit to Tosongrang and the 1946 channelization.

In 1976 the North Korean postal service (DPRK) issued a stamp commemorating Kim Il Sung's 1945 visit to Tosongrang.

[8] In 1998, they issued a stamp souvenir sheet showing Kim Il Sung breaking ground for the construction of the channelization project.