Pipe too deteriorated? Sliplining is not an option.

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Message: It is important to understand the condition of the existing pipe before considering sliplining as a viable option.

In this Alaska dam, the principal outlet conduit was in need of rehabilitation. The pipe was a good candidate for sliplining and the condition of the pipe allowed for a successful rehabilitation.

However, the dam also had an auxiliary overflow conduit that was in need of rehabilitation. As shown in the images below, the pipe was in poor condition and sliplining was not an option. Ultimately, the auxiliary overflow conduit could not be rehabilitated and the pipe was abandoned in place using a cellular grout.

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  Auxiliary overflow culvert has collapsed.

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  Closer image of collapsed culvert.

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  Section of culvert is filled with debris.

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  Debris causing standing water.

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  Abandoned auxiliary outlet at upstream face of dam.

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  Abandoned auxiliary outlet at downstream face of dam.

Note: The content on this page was originally created as part of DamOutletWorks.org (DOWL, 2018). It has subsequently been updated and reformatted as part of the Dam Safety Toolbox.
Revision ID: 4697
Revision Date: 12/02/2022