When Georgetown University approached us with a request for a plan to improve one of their storm drainage systems, we faced challenges in understanding existing below-grade conditions presented by their historic urban campus environment. In order to develop a clear understanding of the existing underground infrastructure, we combined conventional survey techniques, available GIS, CAD as-built data, and paper record drawings to create a single infrastructure information model. The model--showing above and below-ground conditions--allowed for rapid identification of possible solutions for consideration by the client.