Hydrography Event Management Tool for ArcGIS 10

National Hydrography Dataset






The Hydrography Event Management (HEM) Tool Version 2.4 for ArcGIS 10 is now available!

The HEM Tool provides full functionality for adding and editing events in the National Hydrography Dataset (NHD).

Events are informational data linked to the NHD using a linear
referencing system on NHDFlowlines.  The use of events allows vast
amounts of scientific information to be linked to the NHD.

The HEM tool handles all linear referencing mechanics to make working with events easy.  It works on point, line, and area events and allows events to be located interactively, imported, or calculated.

A number of state and federal partners have adopted HEM: Environmental Protection Agency (EPA) incorporated HEM to meet Clean Water Act reporting requirements, the U.S. Forest Service incorporated HEM functionality into their National Resource Information System (NRIS) Aquatic Surveys application, Bureau of Land Management (BLM) incorporated HEM to support event creation for its Oregon/Washington Aquatic Resource Information Management System
and is evaluating its use for a national Riparian Database, and the HEM
Tool is used to georeference water quality data to the NHD, and this
information is then used for Section 303(d) water quality reports on impaired waters.

HEM effort is a unique collaboration between the BLM, U.S. Geological
Survey (USGS), and the EPA that results in ongoing tool development and
support to the expanding HEM user community.

The USGS provides basic to advanced HEM training with easy to follow exercises:

and additional user support in the Troubleshooting Guide.

OR you can request training and support on a specific HEM topic.

To find out more information visit USGS’s HEM site.

NHD Tools



Special thanks to Ariel Bates for providing the post. Questions for Ariel: atbates@usgs.gov

About the author

Project Manager for the ArcGIS Living Atlas of the World Environment Team

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