Characterization of wetland mitigation projects in Tennessee, USA

  • Published source details Morgan K.L. & Roberts T.H. (2003) Characterization of wetland mitigation projects in Tennessee, USA. Wetlands, 23, 65-69.


This study is summarised as evidence for the following.

Action Category

Require mitigation of impacts to marshes or swamps

Action Link
Marsh and Swamp Conservation
  1. Require mitigation of impacts to marshes or swamps

    A study in the 1990s of 50 development projects in Tennessee, USA (Morgan & Roberts 2003) reported that requiring mitigation of impacts to wetlands did not prevent loss of wetland area. Permits for 50 completed development projects required conservation of 104 ha of wetlands to mitigate impacts to 38 ha of wetlands. However, only 78 ha of wetlands were conserved in practice. Furthermore, only 35 ha of these were restored or created, leading to a net loss of 3 ha of wetlands. The other 43 ha of conservation involved preservation or enhancement of existing wetlands, which does not replace lost area. Finally, the study reports that in only 2 of the 50 projects did conservation meet all permit specifications (e.g. hydrology and vegetation establishment). Methods: This study analyzed data from 50 completed development projects across Tennessee, for which state-level Aquatic Resource Alteration Permits demanded mitigation of impacts to wetlands. Wetland areas were surveyed in the field in summer 1997 and 1998: 1–6 years after project completion.

    (Summarised by: Nigel Taylor)

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