Today, Tarek defended his PhD thesis: Hydrologic Performance of Sustainable Urban Drainage Systems in Cold Maritime Climates. As a co-supervisor*, I was very proud to listen to his presentation and scientific discussion with the two opponents Dr. Tone Merete Muthanna from NTNU in Norway and Dr. Ryan Winston from Ohio State University in the US. Among many interesting topics, Tone discussed the role of swales for flow control in cold climates and Ryan discussed aspects of water quality control with infiltration systems. Tarek was, as usual, well prepared and had clear thoughts and answers to all questions, including improvements of future field studies, modelling, and statistical analyses, which I find important for his future career. Congratulations, Tarek, to a very well deserved PhD and a great presentation and defence!

*The formal title I have had at University of Iceland is doctoral committee member. Main supervisor was Hrund Ólöf Andradóttir. Ólafur Gestur Arnalds was in the doctoral committee with me.