1. Department of Civil Engineering, University of Akron, Akron, OH 44325, USA
2. Department of Chemistry and Biochemistry, University of South Carolina, 631 Sumter St., Columbia, SC 29208, USA
3. Department of Crop Sciences and Safe Global Water Institute, University of Illinois at Urbana-Champaign, 1101 West Peabody Drive, Urbana, IL 61801, USA
4. Federal Institute of Hydrology (BfG), Am Mainzer Tor 1, D-56068, Koblenz, Germany