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|Title:||Monitoring of nonpoint source pollutants and sediments at the Ray Roberts Reservoir Wetland Complex, Texas|
|Authors:||Wetlands Research Program (U.S.)|
Downer, Charles Wayne.
|Keywords:||Nonpoint source pollution|
Ray Roberts Reservoir
|Publisher:||Environmental Laboratory (U.S.)|
Engineer Research and Development Center (U.S.)
Abstract: Six wetlands, totaling 70 hectares in area, were constructed in the fluctuation zone of Ray Roberts Reservoir, north of Dallas, TX. The wetlands were constructed to provide waterfowl habitat and water quality improvements at the lake. The wetlands are operated under a moist soil management plan by the Texas Parks and Wildlife Department. In the spring and summer of 1993, one of the six wetlands was monitored for its ability to remove suspended sediments and other nonpoint source pollutants from inflows. Constituents included various forms of the nutrients nitrogen and phosphorous as well as the herbicide atrazine. Sampling of three major storm events indicated that flows to the wetland had high concentrations of total suspended solids and atrazine and lower concentrations of nutrients. While the wetland was able to reduce peak total suspended solids concentrations by approximately 30 percent, the wetland was ineffective at removal of nutrients and herbicides. A very short hydraulic retention time is thought to be a primary cause for the lack of removal. Sediment accretion measured in the wetland with Plexiglas disks averaged 2.2 mm over a 4-month sampling period.
|Appears in Collections:||Technical Report|