While the adoption of GIN grouting procedures for the Kannaviou Dam cut-off is to be applauded it is not, as reported, 'a first for Cyprus' (NCE 16 December).
That accolade must go to the expert remedial team which applied this procedure, allied to the use of ultra finely milled cement, on the foundations of Symvoulos Dam at Episkopi in 1998.
Symvoulos Dam, as with Kouris Dam, is founded on Pakhna Limestone, a structurally and lithologically complex and challenging environment for any water retaining structure. The team was called in when two previous remedial phases of standard grouting had failed to control an accelerating rate of leakage that threatened the viability of the project.
After forensic investigations and a carefully planned GIN based remedial treatment programme, leakage was reduced by over 90%. The result was a sustainable and remarkably efficient water retaining structure. This was 'a first for Cyprus'.
This success clearly demonstrated that effective grouting is a science, not an art. Let us hope that the cut-off design and implementation of GIN procedures at Kannaviou replicates this experience.
Roly Edwards, esp_london@compuserve. com