There's a lot going on under the surface. Pedestrians only see the grates and lids, but below their feet is a maze of vaults, boxes, pipes, and conduits carrying drinking water, storm runoff, sewerage, power, telephone, and cable. The layout and design of these systems is a challenging 3-dimensional feat, requiring knowledge and experience of the technical requirements for each utility. Computer-Aided Design provides a powerful tool for developing a project that keeps the various systems properly separated.