Minnesota Department of Transportation Research Services Section
Human activities including agricultural cultivation, forest harvesting, land development for residential housing, and
development for manufacturing and industrial activities can impair the quality of water entering the wetland,
thereby detrimentally affecting the natural ecological functions of the wetlands. This can lead to degradation of
biota health and biodiversity within the wetland, reduced water quality in the wetland, and increased release of
water quality degrading chemicals to receiving waters. Under natural conditions wetlands develop buffer areas that
provide some protection from the natural processes occurring on adjacent areas of the landscape. Buffers serve the
function of enhancing infiltration of surface runoff generated on adjacent areas, thereby promoting the retention of
nutrients in the soil, and retention of sediment suspended in the runoff water, while still allowing runoff water to
reach the wetland through subsurface flow routes. To protect wetlands and receiving waters downstream from the
wetlands it is important that wetlands in areas disturbed by human activities be provided with sufficient buffer to
prevent degradation of wetland biotic integrity as well as degradation of wetland water quality. The question arises,
“How much buffer is sufficient?” The objective of this study was to investigate the sufficiency of buffers to protect
wetland biotic integrity and water quality, and to evaluate the benefits extended to wildlife by the habit available in
wetland buffers. The study was conducted by using a wetland data base available for 64 wetlands in the Twin
Cities metro area.
Minnesota Department of Transportation
Research Services Section
Nieber, John L.; Arika, Caleb; Lenhart, Chris; Titov, Mikhail; Brooks, Kenneth N..
Evaluation of Buffer Width on Hydrologic Function, Water Quality, and Ecological Integrity of Wetlands.
Minnesota Department of Transportation Research Services Section.
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