It has become possible for many small utilities to develop or utilize hydraulic network models in their day-to-day planning and operational activities. In addition to determining pressures and flows within a particular system, such models can be used to address issues of fire-flow capacity, system reliability, rehabilitation scheduling, emergency response, and energy management. The authors believe that the cost associated with network modeling will be more than offset by better operation and management decisions that will result from a more comprehensive understanding of the network system.