Detailed view for Ishibe

Concerned RiverYasu
TypeInflatable, air filled
Short Description

Ishibe weir is located on the Yasu River, in Japan, and was completed in 2006.

It is an air-filled inflatable dam and it is composed of 4 spans of 38 meters each.

Main characteristics
Water Head (m)Unknown
Upstream height (m)Unknown
Downstream height (m)Unknown
Discharge (m/s)4500
Total length (m)186
Number of spans & dimensions

4 spans of 38 meters each

Weir height (m)3.55
Progress statusCompleted
Date of completion09/15/2006

Kinki Regional Agricultural Administration Office of Ministry of Agriculture, Forestry and Fisheries


Ishibe weir control office

Design group

Sumitomo Electric Industries, LTD


Sumitomo Electric Industries, LTD

Cost estimation11,000,000,000 yen


PIANC References for this project

In progress


Yasu River is gathering water flows coming from several mountain streams and flows through several cities. Despite raising embankments, floods occured more and more regulary, about every 10 years. Therefore, a flood control channel was built between 1958 and 1986.

For a long time, weirs were built in Ishibe for irrigation purpose. The last one was built in 1954. Due to deterioration, it was replaced by the actual inflatable air-filled dam that was built between 1999 and 2006.

The dam is composed of 6 spans, 4 of them being inflatable membranes and the 2 other being roller gates. The membrane are 38 meters wide and 3.55 meters high.

Documents to download
  • 114- PReview WG166- Ishibe weir.pdf - 114- PReview WG166- Ishibe weir.pdf