USGS National Hydrologic Model (NHM)
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This ScienceBase page is the top-level of a hierarchy of information being developed by the U.S. Geological Survey (USGS) in support of the National Hydrologic Model (NHM). This site contains both published and provisional data sets, each of which are separately documented with their own ScienceBase page. This hierarchy is not generally used as a landing page for users to learn about NHM products, but to support the products found on the Modeling of Watershed Systems (MoWS) web site. Visitors are encouraged to begin learning about NHM products via the formal web site. Child items of this page include published and unpublished information in support of the NHM for both the daily Precipitation Runoff Modeling System (PRMS) and the Monthly Water Balance Model (MWBM). Project Organization Evolution The first version of PRMS was developed by scientists the USGS's National Research Program (NRP) and Office of Surface Water for the Water Mission Area (WMA). The PRMS evolved to become the Modular Modeling System (MMS), which allowed the selection of process representation from a suite of modules. The MMS was incorprated as part of the PRMS starting with version 3.0, which has been continually improved. The development team, under the MoWS project, expanded to develop of a national-extent framework for application of the PRMS and the MWBM, including the Geospatial Fabric and the ability to pull and run subset local models from the national framework. In 2017, the NHM development team moved to the Integrated Modeling and Prediction Division within the WMA.