1987 Wetland Delineation Manual - The Wetlands Regulation Center
1987 Wetland Delineation Manual - The Wetlands Regulation Center
1987 Wetland Delineation Manual - The Wetlands Regulation Center
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<strong>Wetland</strong> Delination <strong>Manual</strong>, <strong>1987</strong> 62<br />
d. Adjacent vegetation. Circumstantial evidence of the type of plant communities that<br />
previously occurred may sometimes be obtained by examining the vegetation in adjacent<br />
areas. If adjacent areas have the same topographic position, soils, and hydrology as the altered<br />
area, the plant community types on the altered area were probably similar to those of the<br />
adjacent areas.<br />
e. SCS records. Most SCS soil surveys include a description of the plant community types<br />
associated with each soil type. If the soil type on the altered area can be determined, it may be<br />
possible to generally determine the type of plant communities that previously occurred.<br />
f. Permit applicant. In some cases, the permit applicant may provide important information<br />
about the type of plant communities that occurred prior to alteration.<br />
g. Public. Individuals familiar with the area may provide a good general description of the<br />
previously occurring plant communities.<br />
h. NWI wetland maps. <strong>The</strong> NWI has developed wetland type maps for many areas. <strong>The</strong>se<br />
may be useful in determining the type of plant communities that occurred prior to alteration.<br />
To develop the strongest possible record, all of the above sources should be considered. If the<br />
plant community types that occurred prior to alteration can be determined, record them on<br />
DATA FORM 3 and also record the basis used for the determination. PROCEED TO STEP 4.<br />
If it is impossible to determine the plant community types that occurred on the area prior to<br />
alteration, a determination cannot be made using all three parameters. In such cases, the<br />
determination must be based on the other two parameters. PROCEED TO Subsection 2 or 3 if<br />
one of the other parameters has been altered, or return to the appropriate Subsection of Section<br />
D or to Section E, as appropriate.<br />
• STEP 4 - Determine Whether Plant Community Types Constitute Hydrophytic Vegetation.<br />
Develop a list of species that previously occurred on the site (DATA FORM 3). Subject the<br />
species list to applicable indicators of hydrophytic vegetation (PART III, paragraph 35). If<br />
none of the indicators are met, the plant communities that previously occurred did not<br />
constitute hydrophytic vegetation. If hydrophytic vegetation was present and no other<br />
parameter was in question, record appropriate data on the vegetation portion of DATA FORM<br />
3, and return to either the appropriate subsection of Section D or to Section E. If either of the<br />
other parameters was also in question, PROCEED TO Subsection 2 or 3.<br />
25 February 1997 Environmental Techncal Services Co. 834 Castle Ridge Rd Austin, Texas 78746