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Drilling Industry News

Wetlands Filter Contaminants

June 1, 2005
Constructed wetlands in planned communities can aid in surface water cleanup and flood prevention, according to Purdue University scientists who completed a five-year study on the management system.

The research, begun in 1998 on three constructed ponds - or wetland cells - on a newly renovated golf course on the university campus, showed that 11 of 17 measurable chemicals in surface water were reduced after running through the system, explains Ron Turco, soil microbiologist and senior author of the report. Study results are published in the February issue of the journal Ecological Engineering.

"Golf courses are a perfect place for constructed wetlands used as part of a water management system because wetlands can filter chemicals out of surface water, and they also can store excess water during storms," Turco says.

In addition, constructed wetlands act as a holding area that can provide recycled water for irrigation, a system the scientists used on the golf course. "Constructed wetlands on golf courses and in planned communities are a very good water management system," Turco further explains. "When you build houses, roads and driveways, lots of hard surface is added, leaving no place for water to go. Building dikes and levees just moves the water problem somewhere else, causing flooding elsewhere."

Because golf courses are mostly open surfaces, as opposed to all the hard surfaces in subdivisions and shopping malls, water can soak into the soil and flow into a constructed wetland, he says. As surface water flows from adjacent roads and parking lots onto a golf course and into the constructed wetlands, nutrients, suspended solids, organic metals, trace elements, pesticides and pathogens are removed or even eradicated.

"Wetlands actually add a positive aspect to the water balance of a given region because they are basically infiltration sites," Turco reveals.

The most vital function of constructed wetlands is preventing flooding and environmental contamination. "Use of constructed wetlands can be significant in water management and water quality just by their use on the approximately 16,000 U.S. golf courses the National Golf Foundation lists," Turco says. "In addition, many new home developments are planned around golf courses, and these developments need ways of containing, cleaning and directing water runoff, especially during storms."

The wetlands also are of aesthetic value on golf courses and residential areas, and they create homes for wildlife and flora, he adds. Using the recycled water for irrigation ensures that the wetlands remain wet and the recycled surface water is less expensive than pumping ground water.

The researchers evaluated a three-pond system on Purdue's Pete Dye-designed Kampen Golf Course in order to study the quality of the water from when it entered the golf course until it exited into a holding pond or a recovering natural wetland, the Lilly Nature Center's celery bog, located in West Lafayette, Ind.

The almost 11,000 water plants placed in the ponds are responsible, along with microbes, for retaining or degrading the various chemicals associated with surrounding urban sprawl and the course itself. Some of the chemicals found in entering water included atrazine, chloride, nitrate, ammonia, nitrogen, organic carbon, phosphorus, aluminum, iron, potassium and manganese. In all, 83 chemicals were monitored, but only 17 were present in measurable amounts.

Four water quality monitors located along the wetland system checked for chemical levels. The first monitor was at the golf course's east end where surface water enters the course. The fourth monitor was at the northwest end where water leaves the course and enters the celery bog.

The scientists also measured how much water entered and how fast it flowed through the system, and then compared data taken during both storm and non-storm days.

It's important to design wetlands so they have enough capacity to handle the runoff in the particular water management area, Turco explains. Water flow speed and the ponds' depths must vary to ensure that the microbes remain active so that they can degrade contaminants.

Currently, the scientists are planning new constructed wetlands studies at other venues.

The other researchers involved in this study were Eric Kohler and Zac Reicher, both of the Department of Agronomy, and Vickie Poole, of the Department of Forestry and Natural Resources. Turco and Reicher also are members of the Purdue Turfgrass Program.

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