IHE Delft's staff members are committed to bring water education, research and capacity development to a higher level. Together with its motivated PhD fellows, Alumni, Students and Partners, IHE Delft forms a strong knowledge network of water sector experts.

Staff in focus

Ioana Popescu

Associate Professor of Hydroinformatics

Ioana Popescu is Associate Professor of Hydroinformatics. She joined IHE Delft in 2001 as a junior lecturer. Her teaching and research focuses on computational methods, floods, lake, and reservoirs systems modelling. During her work at IHE, Ioana has been, and still is, involved in several research projects, many funded by the European Union. Ioana likes to work with students, to see how they grow, learn and understand. Working in the special international environment at IHE Delft is enjoyable. She hopes that IHE Delft will continue the great job of offering MSc courses to students from all over the world and she hopes to mentor more PhD students in the future. Ioana thinks that sharing ideas and communicating with experts in a face to face manner is very important and this is why our students are coming to follow courses in Delft, not only for the knowledge they can learn, but also for the opportunity to meet experts and to interact with colleagues from other countries.

Ioana Popescu

Pia Legerstee

Receptionist/Administrative Assistant

Pia Legerstee is Receptionist/Administrative Assistant at IHE Delft. She has worked part-time at the Institute for almost 10 years now. She likes everything in her job: the contact with students and the cultures they bring with them. The front office the ‘face’ of the Institute for students and for visitors who are passing by and they help them with problems, receive phone calls, give information, handle emails, packages etc. - it is very busy, but fun. She loves the Introduction week, Christmas dinner and Social Cultural evenings. Pia was a Meet the Dutch volunteer for 4 years, where she welcomed students to The Netherlands and gave them a taste of the Dutch culture. Pia will retire in March 2018 and she is excited to do more photography, her hobby. She loves to make photos of the weather and the seasons. IHE Delft will always have a special place in her heart.

Pia Legerstee - de Vries


PhD Fellows in focus

Taha AL-Washali

PhD fellow

Taha AL-Washali is an environmental engineer from Yemen. He worked with several international organizations and the ministry of water and environment in Yemen. His research focuses on developing tools and methods that enable water utilities in developing countries to manage and minimize losses in water distribution networks in the Middle East and Africa. He is trying to enable water utilities to understand the nature of their losses and plan corrective measures. Taha developed a novel way of looking at non-revenue water components that can be useful and re-usable in water supply systems in developing countries. He thinks that IHE Delft only looks small from the outside. Yet from the inside, it is deep, diverse and an international environment where people interact to develop and broaden the knowledge of future water ‘musketeers’. After completing his PhD, he would like to sharpen his experience and skills and go back to Yemen to help build the future with peace and development.

Taha Al-Washali

Angélica Rada Ariza

PhD fellow

Angélica Rada Ariza is a Civil Engineer who comes from Colombia. She has always been passionate about the environment and the importance of it in our society. When she was working In Colombia, she noticed that the country is facing a serious  problem regarding the treatment of municipal and industrial wastewater. Approximately 60% of the municipal wastewater in Colombia is not properly treated and is disposed in freshwater bodies. For this reason, Angélica decided to pursue a Master in Sanitation. At the moment, Angélica is doing her PhD research focused on the interactions between microalgae and aerobic bacteria, with the aim of better understanding this symbiosis. This will allow the development of a new type of wastewater treatment called “Photo-Activated Sludge System”, which so far has shown promising results. After Angélica’s defence, she plans to return to Colombia, to finally apply all the knowledge gained in sanitation.  Angélica about IHE Delft: ‘’I like the fact that there are different students with different nationalities and backgrounds. You get to learn not just about technical subjects, but about other realities, cultures and ways of thinking. This takes you out of your comfort zone, in the most rewarding way”

Angelica Rada Ariza

PHD Fellows


IHE Delft has provided post-graduate education to more than 15,000 water professionals from over 160 countries. They form the Institute’s alumni community, the largest global network of water professionals in the world. They are acquiring key positions, supporting the implementation of the global water agenda and improving the quality of life of their communities every day.

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Our students do not only study and share water-related knowledge, but also get to broaden their perspective on the wonders of each others' cultures, religions and beliefs.

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