The life span of a dam may be shortened considerably as a result of karstification beneath the dam. This study is based on an actual field site scenario in which the foundation of a weir is constructed on river sediments overlying gypsum bedrock, where limited flow conditions are expected. The numerical modeling tool, CAVE (Carbonate Aquifer Void Evolution) was used to simulate the development of solution conduits beneath the weir. It was concluded that, under limited flow conditions, if the conductivity of the intervening layer is sufficiently low, leakage rates may not pose a serious...