This thesis is based on the work of the author in the two year period from mid 1962 to mid 1964. During this time he was engaged in developing, writing, testing and using three comprehensive computer programmes. The work was carried out in the Designs Branch, irrigation and Water Supply Commission and at the Computer Centre, University of Queensland.
Two of these programmes deal with the calculation of factors of safety for earth and rockfill dams. Using these two programmes, more than two thousand factors of safety have been calculated for different sections of Callide and Coolmunda Dams. Various other sections have been used with the programmes for checking purposes These have included Geehi, Koombooloomba and Moondarra Dams.
The thesis is divided into two parts. Part I includes the theoretical methods and assumptions used in the equations for the calculation of a factor of safety. It also includes a summary of the types of dam cross-sections that can be used with the programmes. Part II contains the results which have been obtained from the programmes. Since many variations of a basic dam section were investigated, some interesting deductions are noted here.