Strata3 is a PC based computer program which provides a powerful means of storing and interrogating quantitative information on subsurface ground conditions. The input data may be any items of geological or geotechnical information that can be defined spatially; the program is at its most powerful when it is used to create 3-dimensional models of subsurface environments. Two categories of data can be extracted from the models: qualitative data in the form of visual images and graphics and quantitative data in the form of precise measurements displayed in numeric form. The practical applications of the STRATA3 program to civil engineering practice are described and two case studies are presented. The first concerns the collation of site investigation data in an environmental geology project. The second case study illustrates the use of the program for managing chemical contamination data at an old gasworks adjacent to Cardiff Bay.

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