New Hydro Tools: The USGS has released a web-based geospatial services known as the Hydrography Event Management (HEM) Tools that allow users to create, edit, and display geospatial markers, called Events, that are referenced to the National Hydrography Dataset (NHD). Events can be customized by the user to represent nearly any water-related feature. Some examples of Events include streamgages, scenic or impaired stretches of river, fish passage barriers, toxic spills, or put-ins/take-outs for boats.
For this initial release, users can customize their own HEM Web edit tool using a sample application and the required web services. http://bit.ly/R7RvCB