Civil works mainly include planning, design and construction of structures like roads, railways, buildings, water savage, subdivisions, airports, bridges, sewer systems, tunnels and dams. If the concrete is weak and the founding strata is strong there will be structural failure of the concrete. The major types of civil work are roof work, electrical work, stone work, piping works, glass work, coating work, water proofing work. Design process will include strength, stiffness, and stability of the structure when subjected to loads which may be static.