Most civil engineering construction projects are completed to time and budget but few get publicity for it. More often building projects are reported as exceeding time or budget because a building has to cater for the diverse needs of the many users of the building which can be difficult to forecast or may change as construction proceeds. In civil engineering the principal hazards come from the need to deal with below ground conditions, make structures out of re-assembled soils or rocks, and to cater for the forces of impounded or flowing water. The construction of roads, railways, tunnels, bridges, pipelines, dams, harbours,canals and river training measures, flood and sea defences, must all be tailored to the conditions found on site as construction proceeds because it is not possible to foresee such conditions in every detail beforehand.