1 Institute of Technology, Estonian University of Life Sciences, Kreutzwaldi 56/1, 51014 Tartu, Estonia. protima.rauwel@emu.ee.
2 Norwegian Institute for Water Research (NIVA), Gaustadalléen 21, N-0349 Oslo, Norway. wolfgang.uhl@niva.no.
3 Department of Civil and Environmental Engineering, Norwegian University of Science and Technology (NTNU), S. P Andersens Vei 5, 7491 Trondheim, Norway. wolfgang.uhl@niva.no.
4 Institute of Technology, Estonian University of Life Sciences, Kreutzwaldi 56/1, 51014 Tartu, Estonia. erwan.rauwel@emu.ee.