The articles below offer relevant information on wetland systems and wetland protection programs across the United States.  Constructed wetlands are seen as a very useful and innovative tool to manage polluted stormwater runoff.  Wetlands natural and constructed act as the "kidneys" for the earth filtering out pollutants from water.

Articles to check out:

University of New Hampshire Environmental Research Group: Gravel Wetland Fact Sheet
This handout showcases the gravel wetland that is being monitored by the University of New Hampshire Environmental Research Group. It is monitored to determine its effectiveness at removing pollutants from stormwater runoff and for the ability of the wetland to reduce runoff flow to area waterways.
Ohio State University has performed research on the effectiveness of constructed wetlands in comparison to natural wetlands, it was found that these man-made wetlands filtered stormwater as well, if not better than natural wetlands.
Science Daily: "Planted, Unplanted Artificial Wetlands Are Similar at Year 15, and Function as Effective Carbon Sinks"
This article details an experiment that has been carried out over 15 years in an outdoor laboratory between a man-made and planted wetland system and a wetland system that was left to be colonized by plants naturally. The experiment has shown that just as many plants have colonized in the non-planted as were put in the planted and similar or increased levels of stormwater treatment were experienced.
Middletown Journal: "Test wetland project could help Grand Lake St. Marys -- Man-made marshes may help filter and treat polluted water"
In Middletown, Ohio stormwater pollution has been causing issues affecting water quality, harming fish populations, and creating nuisance algal blooms. Read about how constructed wetlands have been used to help achieve reductions in stormwater pollutants entering area waterways.