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Delineation Toolbox

Tools, Forms, Guidance, and Links for Wetland Delineators

Delineation Methods: Approved for Washington State

Washington Wetland Rating Systems: Rapid Functional Assessment Method

Data Forms: Delineation and Rating

WSDOT uses the following customized fill-in data forms:


WSDOT Delineation Guidance


Other Guidance for Washington


Vegetation Tools

  • National Wetland Plant List web page (NWPL) (Corps of Engineers)
  • For plants commonly found in WA, WSDOT uses simple codes instead of the full scientific name to record field data.  A plant code list (pdf 290 kb) (WSDOT 2014) provides the scientific and common names, origin, and the indicator status of based on the NWPL (Version 3.2).   
  • WSDOT developed a corresponding auto-text macro for Microsoft Word (WSDOT 2014) that inserts the same information from the plant codes. Installation instructions, the plant codes and the macro file “Autotext_Plants.dotm” can be obtained from the public FTP server (or the WSDOT internal FTP server).     


Soil Tools


Hydrology Tools

  • The Regional Supplements recommend using the methods described in Chapter 19  of the USDA NRCS Part 650 Engineering Field Handbook to determine if antecedent precipitation is normal. 
  • The University of Washington web page provides precipitation data from  1996-2008 with graphs. 
  • The U. S. Geological Survey StreamStats in Washington Interactive Map can be used to determine the area of a watershed upstream of a given point. This map is useful for many functional assessment methods, including question D 3.3 in the Western Washington Rating System.  Instructions on using the Interactive Map are available from the User Instructions link in the green box on the Stream Stats page. Selecting a site and delineating a watershed is the 4th topic on the User Instructions page. The tool becomes available at scales of 1:24000 and greater, and your Pop-up blocker needs to be turned off.
  • WSDOT installs shallow groundwater monitoring wells in accordance with the guidance available in the Wetlands Regulatory Assistance Program Technical Notes  Corps of Engineers web page:

            -Noble, C. 2006. "Water Table Monitoring Project Design" 
            -U. S. Army Corps of Engineers. 2005. "Technical Standard 
                for Water-Table Monitoring of Potential Wetland Sites" 
            -Sprecher, S. W. 2000. "Installing Monitoring Wells/Piezometers 
                in Wetlands"


Classification Methods 


Functions Characterization/Assessment

Optional methods to evaluate functions. Other methods may also be appropriate for use.

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