What is a reach? <!-- geospatial data, rivers, National Hydrography Dataset, NHD -->
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Frequently Asked Questions

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USGS Frequently Asked Questions

Question: What is a reach?

Answer:

Each reach is a continuous piece of surface water with similar hydrologic characteristics, such as a stretch of stream between two confluences or a lake. Some unconnected (isolated) features are also reaches, for example, isolated lakes and single, unconnected streams.

Source of this FAQ:
http://nhd.usgs.gov/nhd_faq.html

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