Sealing of a flood control dam

Westhofen, Rhineland-Palatinate

Preparations of a slurry wall  – Below the completion of flood retention basin dam seepage were noted. To resolve this seepage in a 140 m long and up to 20 m deep secant pile wall in the lower third of the existing dam was built. To enable the execution of the vertical seal, extensive earthworks were required at the dam. For the large scale drilling equipment a temporary wall was backfilled with road as a standing surface. After completion of the operation the dam surface was fully restored.

Remediation measures

  • Hydrogeological exploration
  • Redevelopment concept and variation study
  • Planning of the vertical seal as overlapped bored pile walls
  • Tendering
  • Construction supervision
  • Geotechnical and hydrogeological support of the entire measure

Special features

Crossing the bottom outlet
A particular technical challenge was the crossing of the bottom outlet. For this purpose, a 6 m deep separate pit was produced and the existing pipeline dismantled. After production of the piles below, a new pipe was laid.
All around, a tone poem was built.