Survey Mapping, Level Contouring, Land development

I use Civil 3D and Autodesk Land Development CAD software for importing survey points in the drawing. The plotting of Landmarks is carried out and the contouring of 3D XYZ points is generated. This surface of points is useful for planning any land development as road design, Canal Layout, Drainage Layout, Cathement area calculation etc. I have done several of such work. One of the sample work image is attached.