3D Utility Models—What to Consider

Advancements in digital design platforms have brought about increased use of 3D modeling of utility mapping for design purposes. While 3D models can be a useful tool to mitigate risk to a project, the accuracy and remaining uncertainty of such models must be documented in detail in order to truly minimize project risk and maximize the value of the model. ASCE 38-22 has elevated the understanding of risk associated with different quality levels. The inclusion or expansion of 3D depictions of utilities should start with ASCE 38-22 and provide clarity and source of the vertical or z values of utility information depicted in the model. The use of records, geophysical depths, sizes and shapes of structures, historical local knowledge, and professional best estimates to populate depth values all bring their own uncertainty to the 3D model. Understanding that uncertainty is a necessary component of the design engineers’ knowledge to mitigate and manage project risks. This paper will provide suggested best practices to the creation of a 3D utility model, based on case studies.