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US Digital Flood Insurance Rate Map - Water Lines

US Federal Emergency Management Agency (FEMA)
  • Added 17 Sep 2016
  • Updated 03 Sep 2018

Location and attributes for hydrography features shown on FIRM as lines.

The S_Wtr_Ln table contains information about surface water linear features. The spatial elements representing surface water line features are lines. Normally stream centerlines will be represented as line features. However, the main purpose of the S_Wtr_Ar table and the S_Wtr_Ln table is to provide a cartographic depiction of the surface water features for visual interpretation of the mapping data. As a result, the method for structuring surface water features as lines or polygons is very flexible. Lake shorelines and stream channel banks used to show lakes and wide rivers may be represented as polygons. However, they may be represented as lines based on the structure of the data received and the mapping partner’s discretion. Surface water features may appear in either the S_Wtr_Ar table or the S_Wtr_Ln table or both. The hydrologic structure of the modeled stream network will be represented by the S_Profil_Basln layer. This information is used in the Transect Locator Map and the FIRM Panel Index in the FIS report, as well as the FIRM panels.

This layer is a component of Region Preliminary Data.


Copyright Copyright may apply. Please check the source for more information.
RegionsNew Jersey, New York, Franklin Parish, Madison Parish, Richland Parish, Tensas Parish, Washington

Technical Details

Layer ID 25577
Data type Vector multilinestring
Feature count 96819 (incl. 9 with empty or null geometries)
Services Vector Query API


Added 17 Sep 2016 ago
Last checked 1 Sep 2018 ago
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