ESRI has developed models for Water Resources and has focused on surface water with input from key state, national, and international contributors. The ArcGIS Hydro model is available for review and download. We are also supporting a groundwater data model initiative and will eventually consider the full hydrologic cycle as part of the Hydro effort. Summary Provided By: http://support.esri.com/index.cfm?fa=downloads.dataModels.filteredGateway&dmid=15
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