ASDSO Dam Safety Toolbox

Slipline Example 2

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Message: Sliplining can extend a dam's design life.

The conduit through this dam was made of corrugated metal. A valve was placed at the downstream end by the owner. The combination of a downstream valve and a corrugated riser pipe led to significant leakage. The pipe was in good condition, but it wasn't made to be pressurized. Sliplining the conduit with HDPE pipe successfully restored the functionality of the dam.

  • The CMP outlet of this dam needed rehabilitation. The downstream risk was relatively low.

    The CMP outlet of this dam needed rehabilitation. The downstream risk was relatively low.

  • The conduit was sliplined with a fused HDPE pipe.

    The conduit was sliplined with a fused HDPE pipe.

  • A downstream valve was used, which is generally discouraged; however, fusion welds do not tend to leak. The valve was considered acceptable because many of the problems with upstream gates in cold climates were avoided.

    A downstream valve was used, which is generally discouraged; however, fusion welds do not tend to leak. The valve was considered acceptable because many of the problems with upstream gates in cold climates were avoided.

  • Sliplining this dam's conduit was advantageous because it was cheaper than full replacement and provided a reliable solution.

    Sliplining this dam's conduit was advantageous because it was cheaper than full replacement and provided a reliable solution.


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: 4700
Revision Date: 12/02/2022

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