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Sediment bypass tunnel outlet at Wujie Dam

USACE staff investigate the Pfaffensprung sediment bypass tunnel in Switzerland. This critical piece of infrastructure flushes material from the dam’s pool, which can include sediment and larger matter.

The Pfaffensprung sediment bypass tunnel is visible from above the dam and the outlet. This infrastructure has been in use for over 100 years and continues to provide flood protection and hydropower for the surrounding communities.

Wear can be seen on granite pavers in the Pfaffensprung tunnel where the movement of particles through water has caused a groove to form in the material.

The group observes the transition between the granite and basalt at the Pfaffensprung sediment bypass tunnel.

A Swiss engineer investigates a worn area in the Solis sediment bypass tunnel. At about 18 feet by 18 feet, this tunnel is nearly the same size as the proposed dimensions for the upcoming project at Lowell Creek in Alaska.

Type	Subtype	Date	Description	Notes	Source
commons	image		Sediment bypass tunnel outlet at Wujie Dam		Commons
commons	image		USACE staff investigate the Pfaffensprung sediment bypass tunnel in Switzerland. This critical piece of infrastructure flushes material from the dam’s pool, which can include sediment and larger matter.		Commons
commons	image		The Pfaffensprung sediment bypass tunnel is visible from above the dam and the outlet. This infrastructure has been in use for over 100 years and continues to provide flood protection and hydropower for the surrounding communities.		Commons
commons	image		Wear can be seen on granite pavers in the Pfaffensprung tunnel where the movement of particles through water has caused a groove to form in the material.		Commons
commons	image		The group observes the transition between the granite and basalt at the Pfaffensprung sediment bypass tunnel.		Commons
commons	image		A Swiss engineer investigates a worn area in the Solis sediment bypass tunnel. At about 18 feet by 18 feet, this tunnel is nearly the same size as the proposed dimensions for the upcoming project at Lowell Creek in Alaska.		Commons