Predicting Sustainable Ground Water to Constructed Riparian Wetlands: Shaker Trace, Ohio, USA
Water isotopy is introduced as a tool to design, locate, and select storm water best management practices for the prediction of sustained ground water inflows to prospective constructed wetlands. A primer and application of the stable isotopes, 18O and 2H, are discussed for riparian wetland restoration areas among an agricultural landscape in southwestern Ohio. Conventional piezometric measurements were ambiguous in identifying groundwater mounding across a transect which includes numerous agricultural tile drains. Instead evaporative potential data represented by 18O values indicated a well delineated zone for prospective constructed wetlands. All successful constructed wetland areas thus far at Shaker Trace are represented by ground water with depleted 18O values below –9.0 VSMOW. Such areas of sustainable ground water inflow could either be due to perched units at depth or simply the result of an increased flow gradient.