Services & Activities

Sediment Management

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 River water transports sediment from upstream areas. Heavy rainfall increases the volume of sediment run-off, and if landslides or debris flow occurs, serious damage may occur in the downstream areas. Increase of sediment flowing into reservoirs may also lead to shortening of effective life time of the reservoirs.

On the other hand, when natural sediment supply to downstream areas is cut off by the existence of cross-river structures such as dams, it may sometimes lead to lowering of river bed downstream and/or erosion of coastal zones. In such cases, we should consider re-establishing natural sediment flow along the river. This concept is called "sediment management".

NEWJEC has many experiences in sediment management studies. In particular, sediment flushing technology of dams that we have developed in cooperation with KANSAI Electric is the achievement outstanding in engineering consulting firms. We are proud to announce that the sediment bypass system of Asahi Dam reservoir we designed was awarded the Technical Award of JSCE (Japan Society of Civil Engineers) in 1999.

Outline of Sediment Flushing by Concerted Operations of Serial Dams
Outline of Sediment Flushing by Concerted Operations of Serial Dams

Bypass Tunnel
Sediment Discharge Operation of Asahi Dam Reservoir
at the Outlet of Bypass Tunnel

Technical Brochures
● Sediment Bypass System
  Technical Award
  Awarded the Technical Award of JSCE in 1999
● Simulation of Sediment Flushing by the Associated Operation of Dashidaira-dam
  and Unazuki-dam along the Kurobe River