1. M. Sc., Aalto Univ. School of Science and Technology, Water Engineering Research Group, P.O. Box 15200 FI-00076, Aalto, Finland (corresponding author).
2. Prof., Aalto Univ. School of Science and Technology, Water Engineering Research Group.
3. Managing Director, Kiuru & Rautiainen Ltd., Olavinkatu 24, FI-57130 Savonlinna Finland.