Civil engineering is the oldest of the main branches of engineering. Civil engineers use their knowledge to supervise and plan construction projects such as roads, airports, bridges, canals, tunnels, and wastewater systems. They also collaborate with architects to design and construct various types of buildings. Some other civil engineering endeavors include highways, airports, pipelines, railroads, levees, and irrigation and sewage systems. Civil engineers try to design their structures to be functional, efficient and durable