GIS and hydraulic modeling are complementary technologies. By integrating them with each other, water utility companies can reap substantial time and cost savings.  A well-designed integration of the two systems provides ready access to mission-critical data. As a result, risk-of-failure analysis, repair and replacement, capacity assessment, capital improvement planning, and numerous other water utility applications run more efficiently and more effectively.  Hydraulic Modeling and GIS identifies the challenges that must be navigated and offers best practices for achieving an integration that will be sustainable over the long term.