Permanent Seepage Measures
Permanent seepage control measures are used when the seepage condition is not an imminent
threat to the safety of the dam, and sufficient time is available to design and construct a longterm
remedial measure.
Permanent seepage control measures include:
• Monitoring the seepage and seepage control measures.
• Lowering the reservoir and restricting the reservoir level.
• Pressure grouting to penetrate and seal cracks and voids in the area, thus blocking
seepage paths.
• Constructing cutoff walls.
• Constructing an impervious blanket immediately upstream of the dam.
• Constructing a weighted filter/berm downstream of the dam.
• Installing drains, filters, and relief wells.
• Providing drainage.
• Using a combination of methods.
If it is determined that remedial measures are not feasible due to cost or other obstacles,
decommissioning and removal of the dam may need to be considered.