Wetland and Watercourse Delineation and Functional Assessment

Evans Associates has extensive experience in conducting wetlands delineations and has delineated the wetlands on over 1,000 sites in New York and Connecticut ranging in size from less than 1 acre to over 2,000 acres.  Typically the wetlands delineation is conducted by a field team consisting of a soil scientist and a wetland biologist.  The use of an interdisciplinary team provides a slightly different perspective of a site which is particularly helpful in assessing problematic areas where the wetland/upland boundary is not clearly defined. 

Evans Associates staff is well versed in the local, state and federal wetland/watercourse regulations and in determining which regulatory jurisdiction(s) a wetland and/or watercourse is applicable.  After the wetlands are delineated on a site Evans Associates interacts with the applicable regulatory agency to have the wetlands boundary formally confirmed as accurate.  In the great majority of cases the regulatory agency finds our wetlands boundary accurate as delineated and no modifications are required.

wetlandIn addition to delineating the wetland boundaries Evans Associates staff are experienced in determining the functions and values provided by a wetland.  The functions and relative values of freshwater wetlands are determined by biological and physical characteristics, including the position of the wetland in the landscape, the hydrology and geology of the site, and the substrate and vegetation comprising the wetland. 

During the wetlands field delineation biological and physical data are collected to characterize the wetland.  The field data are entered into the model “A Rapid Procedure for Assessing Wetland Functional Capacity based on Hydrogeomorphic (HGM) Classification” (Magee and Hollands, 1998) which provides a quantitative assessment as to which functions and values the wetlands performs.

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