It encompasses many technical specialisations whose focus is the design of large, normally one-of-a-kind, and facilities such as bridges, buildings, tunnels, highways, dams, waterways, airports, flood control systems, coastal protection systems, water supply networks, and waste treatment plants. Civil engineering takes place on all levels: in the public sector from municipal through to national governments, and in the private sector from individual homeowners through to international companies. As our society expands, challenging opportunities will continue to be available for Civil Engineers practising in their own private firms, in large companies, or in governmental agencies.