Today I found the cool topic called "Site Topology - Part One Anyway" from the CivilCommunity; Topology is the algorithm to model the real world, after you create the topology, you can do the spatial analysis have the shortest path analysis, buffering analysis, line-of-sight analysis, etc.. Anthony demonstrate

the Grading features of the Civil 3D and show how to work with the alignment. You also can define a parcel rules - "Parcel Rules - Explained".

Full article Civilcommunity & Civil 3D Rocks