Asphalt Specialists In Hydraulic Engineering


Coastal Protection
Dam Waterproofing

Dam Erosion Protection

Walkerwood Reservoir
Loch Ericht
Rivelin Dam
Baddinsgill reservoir
Megget Reservoir

Withen's Clough Reservoir

Dam Spillway Protection
Ports & Harbours
Flood Alleviation
River Training
Scour Protection
Underwater Impact Protection
Strengthening Rock Structures
Landfill Linings
Offshore Services

Withens Clough Reservoir


Withens Clough reservoir is an impounding reservoir in the Pennines.  Typical of dams built in the second half of the 19th Century it has a clay core and its upstream face was protected by hand-placed stone pitching.  Over the years fines had been washed away from behind the pitching leaving voids.

The solution was to fill the voids with Lean Sand Asphalt (LSA) and overlay the pitching with Open Stone Asphalt (OSA).  The water from the moors is quite acidic in the upper catchment resevoirs so the OSA was made with a non-limestone aggregate which still had good adhesion to bitumen.

  • Dam length 250m, max. slope length 12m
  • Lean Sand Asphalt placed to fill voids between stone pitching
  • Withens175mm Open Stone Asphalt placed over upstream face.
  • Non-limestone aggregate used due to acidic water
  • Grouted rock placed at toe

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