An automated network model calibration and optimization module is included with WaterNET, based upon a genetic algorithm and optimal control computational scheme. This module allows the modeler to quickly calibrate the model to match field observations, thereby validating the credibility of the network model for reliable and cost-effective engineering and planning decisions with regard to network design, rehabilitation, expansion, and replacement. The user can define what pipes in the model can have their roughness adjusted to meet observed values, as well as define the allowable range of values that can be used. In addition to calibrating the model, this module can also be used to quickly troubleshoot the model. It can automatically locate where potentially closed, degraded, or leaking pipes are located within the actual network system-allowing the modeler to assist in maintenance and rehabilitation of the system.