In summary, ESP uses deterministic hydrologic models and a scenario-based approach to produce an ensemble of streamflow hydrographs. The results can be expressed in terms of stage, discharge, or runoff, and have a probability value. Either historic or conditional simulations can be generated. Output specifics of time periods or flow characteristic can be varied depending on the need of the user. Finally, verification tools are being developed to help in the evaluation and product improvement of ESP.