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The Hydrologic Engineering Center's River Analysis System (or simply HEC-RAS) is river water modeling software.

HEC-MetVue facilitates viewing and manipulation of meteorological datasets as well as performing a variety of computations and analyses, including temporal and spatial aggregation of datasets and areal average computations.

The Ecosystem Functions Model (HEC-EFM) is designed to help study teams determine ecosystem responses to changes in the flow regime of a river or connected wetland.