I am running Civil Design in Autodesk LDD 2006 and receive Fatal Error: Unhandled Access Violation Reading 0x000 Exception at xxxxxxxxx. The errors seem to occur when I invoke commands that require heavy computational work like grading to a surface, building a surface, or generating contour...
A good source for the soils investigation is Natural Resources Conservation Service, National Engineering Handbook Section 8, "Engineering Geology". Technical Release #60, "Earth Dams and Reservoirs" is a good reference for the hydraulic design. And, National Engineering Handbook Part 642...