抄録
The main objective of this study announces characteristics on the oblique weir from the viewpoint of the configurations and the construction history of existent oblique weirs in Japan. The oblique weir is the structure which build diagonally on the plane plan of the channels for the intake of the surface water on the river. The results are summarized into 3 points as follows. 1) The plane figure of the oblique weirs are classified to the types of 12. 2) The most distribution area of the oblique weirs is situated at the Asahi River basin. 3) The construction origin of numerous weirs trace to the Edo era, whereas several weirs build at the present age, for instance the Higashitenryu Weir on the Tenryu River basin, the Nangan Weir on the Naka River basin, etc. Consequently the oblique weir is hard to affirm the old structure.
