Kotmale Dam and Observations on CFRD

by Edward M. Gosschalk,
A. N. S. Kulasinghe,

Document Type: Proceeding Paper

Part of: Concrete Face Rockfill Dams—Design, Construction, and Performance

Discussion: Casinader Ranji (See full record)
Discussion: Kulesza Richard (See full record)
Closure: (See full record)


A concrete faced rockfill dam was the type selected for the 300 ft (90 m) dam at Kotmale in Sri Lanka for reasons of economy and speed in construction. Standard design concepts were tailored to the site to suit foundations weak in shear strength and potentially porous limestone underlying the dam at depth. The dam was designed with a view to possible future raising by up to 100 ft (30 m). Instruments installed to monitor performance of the dam included a microseismicity sensing network. Instrumentation gave satisfactory performance although piezometer readings have been difficult to interpret. Development towards a higher degree of soundness of concrete for maximum density and impermeability and minimum shrinkage as well as conservatism in the design of concrete membranes and their waterstops are advocated.

Subject Headings: Dams | Concrete dams | Dam foundations | Foundation design | Earthfill dams | Load and resistance factor design | Shear strength | Rockfill dams | Sri Lanka | Asia

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