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I can't chose just one important software for civil engineers because there are many aspects in civil engineering, for example drawings and conception AutoCAD is irreplaceable, mechanic calculations and simulation Robot is a good choice, for management and works schedule Primavera is the one. So you see it depends on the task that you chose your software.
Primavera P6 is most important software for civil engineer/construction engineer
There are many software used in civil engineering, main is Primavera because it is used for project's planning, scheduling, cost checking. while the Autocad used for drawing purpose, SAP/GRASP for designing purpose.