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  • Study Reaches

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Key Points

  • Site and Reach Name are required.
  • Delineation Date is highly recommended.
  • Reaches are project and station-specific
  • The full reach name is a combination of:
    • 1) SiteNumber
    • 2) ReachName, and
    • 3) Project
  • For example, '43185411440912–visitor center-SilverTNC' is a reach near NWIS station 43185411440912 used by the SilverTNC project that they called "visitor center"
  • The design of the BioData Study Reach incorporates Reaches incorporate ideas from NAWQA, NRSA, and other ecological studies. You may delineate a study reach
  • Study reaches may delineated in several ways, including:
  • Narrative descriptiondescriptions
  • In relation to a Reference Location
  • Upstream and downstream boundaries (Latitude/Longitude or Description)

Conventions for recording reach boundaries


If either boundary is upstream from the reference location, the curvilinear distance (along the thalweg) is negative; otherwise, the distance is positive.

'Curvilinear reach length' = 'Curvilinear distance to downstream boundary' MINUS 'Curvilinear distance to upstream boundary'

The stars (star) represent reference locations in the 3 examples: A, B, and C