1987 Wetland Delineation Manual - The Wetlands Regulation Center

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Wetland Delination Manual, 1987 40 STEP 1 - DETERMINE WHETHER AVAILABLE DATA ARE SUFFICIENT FOR ENTIRE PROJECT AREA YES STEP 2 - DETERMINE WHETHER HYDROPHYTIC VEGETATION IS PRESENT YES STEP 3 - DETERMINE WHETHER WETLAND HYDROLOGY IS PRESENT YES STEP 4 - DETERMINE WHETHER SOILS PARAMETER MUST BE CONSIDERED YES STEP 5 - DETERMINE WHETHER HYDRIC SOILS ARE PRESENT STEP 6 - WETLAND DETERMINATION YES STEP 7 - DETERMINE WETLAND BOUNDARY (IF NECESSARY) NO NO NO NO NO ONE OR MORE PARAMETERS MUST BE CHARACTERIZED OVER ENTIRE PROJECT AREA ALL PARAMETERS ADEQUATELY CHARACTERIZED IN PART, BUT NOT ALL OF AREA AREA IS NOT A AREA IS NOT A WETLAND AREA IS NOT A WETLAND PROCEED TO SUBSECTION 2 PROCEED TO SUBSECTION 3 Figure 13. Flowchart of steps involved in making a wetland determination when an onsite inspection is unnecessary 25 February 1997 Environmental Techncal Services Co. 834 Castle Ridge Rd Austin, Texas 78746
Wetland Delination Manual, 1987 41 • STEP 3 - Determine Whether Wetland Hydrology Is Present. When one of the following conditions applies (STEP 2), it is only necessary to confirm that there has been no recent hydrologic alteration of the area: a. The entire project area is occupied by a plant community or communities in which all dominant species are OBL (Appendix C, Section 1 or 2). b. The project area contains two or more plant communities, all of which are dominated by OBL and/or FACW species, and the wetland-nonwetland boundary is abrupt (e.g. a Spartina alternifzora marsh bordered by a road embankment). * There must be documented evidence of periodic inundation or saturated soils when the project area: a. Has plant communities dominated by one or more FAC species; b. Has vegetation dominated by FACW species but no adjacent community dominated by OBL species; c. Has a gradual, nondistinct boundary between wetlands and nonwetlands; and/or d. Is known to have or is suspected of having significantly altered hydrology. If either a or b applies, look for recorded evidence of recently constructed dikes, levees, impoundments, and drainage systems, or recent avalanches, mudslides, beaver dams, etc., that have significantly altered the area hydrology. If any significant hydrologic alteration is found, determine whether the area is still periodically inundated or has saturated soils for sufficient duration to support the documented vegetation (a or b above). When a or b applies and there is no evidence of recent hydrologic alteration, or when a or b do not applv and there is documented evidence that the area is periodically inundated or has saturated soils, wetland hydrology is present. Otherwise, wetland hydrology does not occur on the area. Complete the hydrology section of DATA FORM 1 and PROCEED TO STEP 4. • STEP 4 - Determine Whether the Soils Parameter Must Be Considered. When either a or b of STEP 3 applies and there is either no evidence of recent hydrologic alteration of the project area or if wetland hydrology presently occurs on the area, hydric soils can be assumed to be present. If so, PROCEED TO STEP 6. Otherwise PROCEED TO STEP 5. o STEP 5 - Determine Whether Hydric Soils Are Present. Examine the soils data (Section B, STEP 7) and record the soil series or soil phase on DATA FORM 1 for each community type. Determine whether the soil is listed as a hydric soil (Appendix D, Section 2). If all community types have hydric soils, the entire project area has hydric soils. (CAUTION: If the soil series description makes reference to inclusions of other soil types, data must be field verified). Any portion of the area that lacks hydric soils is a nonwetland. Complete the soils section of each DATA FORM 1 and PROCEED TO STEP 6. • STEP 6 - Wetland Determination. Examine the DATA FORM 1 for each community type. Any portion of the project area is a wetland that has: a. Hydrophytic vegetation that conforms to one of the conditions identified in STEP 3a or 3b and has either no evidence of altered hydrology or confirmed wetland hydrology. 25 February 1997 Environmental Techncal Services Co. 834 Castle Ridge Rd Austin, Texas 78746
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1987 Wetland Delineation Manual - The Wetlands Regulation Center

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