Delineation Tools Links

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Notice: Links to non-EPA sites do not imply any official EPA endorsement of, or responsibility for, the opinions, ideas, data or products presented at those locations, or guarantee the validity of the information provided. Links to non-EPA servers are provided solely as a pointer to information on topics related to environmental protection that may be useful to EPA staff and the public.

• EPA's Office of Research and Development (ORD): WHPA Model
  This model is a semi-analytical ground-water flow simulation program used for delineating capture zones in wellhead protection areas.
• EPA's Office of Water: Watershed Assessment, Tracking and Environmental Results, Reach File
  Contains data from a series of national hydrologic databases that identify and interconnect the stream segments comprising the surface water drainage system.
• EPA's Office of Wetlands, Oceans, and Watersheds (OWOW): Surf Your Watershed
  Surf Your Watershed contains sets of environmental data that can be queried to provide environmental profiles for specific watersheds.
• Federal Emergency Management Agency (FEMA): Mapping and Analysis Center
  Provides mapping products available for presidential declared disasters and tropical storms/hurricanes.
• U.S. Department of the Interior: Geological Survey (USGS), Earth Science Information Center
  A collection of educational resources, maps, and other sources of information that provide impartial scientific information to resource managers, planners, and other customers are available from this Web site. assessments.
• U.S. Department of the Interior: Geological Survey (USGS), Ground Water Atlas of the United States
  Describes the location, extent, and geologic and hydrologic characteristics of many aquifers in the nation.
• U.S. Department of the Interior: Geological Survey (USGS), National Hydrography Dataset (NHD)
  NHD is a comprehensive set of digital spatial data that contains information about surface water.
• U.S. Department of the Interior: Geological Survey (USGS), Water Resources of the United States, Hydrologic Unit Maps
  Defines and explains Hydrologic Unit Maps and contains links to download specific hydrologic units names and numbers.