One of the most powerful, yet relatively unknown features available in HEC-RAS is the HECRASController. TheHECRASController API has a wealth of procedures which allow a programmer to manipulate HEC-RAS externally by setting input data, retrieving input or output data, and performing common functions such as opening and closing HEC-RAS, changing plans, running HEC-RAS, and plotting output. HECRASController applications are seemingly endless. Not only can the retrieval and post-processing of output be automated, but with the HECRASController, real-time modeling and probabilistic experiments...