Changes

The stone hammer and percussion gouge are not individual drilling methods, but used to supplement other methods when boulders, rubble or hard clay is encountered during drilling. Although it does not penetrate very hard stone such as basalt, it is a tougher option than other options such as the [[Rota sludge well drilling|Rota-sludge method]] or the [[EMAS well drilling | EMAS method]].

This technology is being refined further in India and Nicaragua. The Stone-hammer method has won a competition for innovative irrigation technologies organized by the World Bank, Winrock and International Development Enterprises (IDE).