Faisal Bin Ashraf¹, Ali Torabi Haghighi¹, Joakim Riml², Jarkko J Koskela³, Bjørn Kløve¹ and Hannu Marttila¹, (1)University of Oulu, Water, Energy and Environmental Engineering Research Unit, Oulu, Finland, (2)Royal Inst. of Technology, Stockholm, Sweden, (3)Finnish Environment Institute, Helsinki, Finland