What all things he use to do?

CIVIL ENGINEERS plan, design, and direct the construction and
maintenance of roads, bridges, pipelines, subdivisions, airports, waste
water systems, and many other types of facilities.
Civil Engineers may design the main features of a project, then direct
the work of drawing plans, writing specifications and preparing final
cost estimates.In the field they usually do surveying, site
investigation, or construction inspection or supervision.
In structural work, engineers may work on detailed calculations to be
certain that design features meet all structural requirements.
In transportation, engineers design streets and highways and plan
alterations to improve traffic flow. They do survey work, draw
preliminary plans, or inspect and test materials to be used in
construction.