Taha Al-Washali

PhD fellow


Mr. Taha Mohammed Al-Washali graduated on 21 December 2020. Find the link to his thesis here.

Taha AL-Washali is a water engineer from Yemen. Currently, he is a Ph.D. fellow in water supply engineering, working on developing tools and methods that enable water utilities to manage and minimize losses in water distribution networks, with a particular focus on intermittent supply.

Taha AL-Washali got his bachelor's degree in civil engineering from Sana’a University, Yemen, and got his master of science (Excellent) in water resources management from Cologne University, Germany. He joined the water sector from the first day of his bachelor graduation, and becomes more inspired about water by every day goes by. He started in a GIZ project, a project engineer at KFW national project, and later became a general director of the projects department in the national water supply and sanitation authority in Yemen. He worked in many projects for several governmental and international agencies, including GIZ, KFW, USAID, WHO, and OXFAM. He also contributed to several policies, strategies and key reports in the Yemeni water sector. In 2014, he joined academia starting in a project aiming to build the capacity of the Water and Environment Center at Sana’a University. Since then, his research interests focus on water supply efficiency, including water loss assessment, modeling and minimization, pressure management, leakage control, water meter accuracy, and apparent losses. Besides water loss management, interesting research includes real-time break-event detection, asset management, and benchmarking (PIs).


Losses in Water Distribution Networks: a Study on the Assessment of Water Loss and its Components and Sub-Components in Developing Countries


AL-Washali, T., Sharma, S., Lupoja, R., Al-Nozaily, F., Haidera, M., and Kennedy, M. (2020). "Assessment of water losses in distribution networks: Methods, applications, uncertainties, and implications in intermittent supply." Resources, Conservation and Recycling, 152(1), 104515.

AL-Washali, T., Sharma, S., Kennedy, M., AL-Nozaily, F., & Haidera, M. (2019). Monitoring the Non-Revenue Water Performance in Intermittent Supply. Water, 11(6)1220.

AL-Washali, T., Sharma, S., Kennedy, M., AL-Nozaily, F., & Haidera, M. (2019). Modelling the Leakage Rate and Reduction Using Minimum Night Flow Analysis in an Intermittent Supply System. Water, 11(1) 48.

AL-Washali, T., Sharma, S., & Kennedy, M. (2018). Alternative Method for Nonrevenue Water Component Assessment. Water Resources Planning and Management, 144(5),  04018017.

AL-Washali, T., Sharma, S., & Kennedy, M. (2016). Methods of Assessment of Water Losses in Water Supply Systems: a Review. Water Resources Management, 30(14), 4985-5


LinkedIn: https://www.linkedin.com/in/taha-al-washali-2201ab59/

ResearchGate: https://www.researchgate.net/profile/Taha_Al-Washali

Other information


AL-Washali, T., Sharma, S., Kennedy, M., AL-Nozaily F, and Haidera M. (2019). Normalizing Water Loss Level in Intermittent Supplies. IWA 1st Intermittent Supply Confernce. 2019, April 7-9, Kampala, Uganda.

AL-Washali, T., and Noaman A. (2019). The Yemen Experience on Water Harvesting. Nairobi Knowledge and Experience Exchange Symposium, March 4-8, Nairobi, Kenya.

AL-Washali, T., Sharma, S., Kennedy, M., AL-Nozaily F, and Haidera M. (2019). Analysis of the potential of leakage reduction scenarios: Are they dependent on each other?. IWA Water Efficient 2019, January 13-16, Manila, The Philipenese.

AL-Washali, T., Sharma, S., Kennedy, M., Lupoja R. P., Shawagfeh Z., AL-Nozaily F, Haidera M., AL-Koli H. S., and AL-Shaieb R. (2018). Comparative Analysis of Non-Revenue Water Assessment Methods in Three Cases in Developing Countries. IWA Water Loss 2018, May 7-9, Cape Twon, South Africa.

AL-Washali, T., Sharma, S., Kennedy, M., AL-Nozaily F, and Haidera M. (2018). Water Loss Assessment and Monitoring in Intermittent Supplies. International Conference for Sustainable Development of Water and Environment 2018, January 18-19, ChenYang, China.

AL-Washali, T., Sharma, S., and Kennedy, M. (2017). Water Loss Monitoring. German Arab Master Programs Conference 2017, November 2-3, Berlin, Germany.

AL-Washali, T., Sharma, S., and Kennedy, M (2017). Water Loss Assessment in Developing Countries. IHE-Delft PhD Symposium 2017: Climate Extremes and Water Management Challenges, October 2-3, Delft, The Netherlands.Best Presentation Prize.

AL-Washali, T., Sharma, S., Kennedy, M., AL-Nozaily F, and Haidera M. (2017). Does A Lower Non Revenue Water Level Always Mean Better Performance?. IWA Benchmarking Conference 2017, May 15-17, Vienna, Austria.

AL-Washali, T., Sharma, S. Kennedy, M. and Shwagfeh, Z. (2017). Economic Modeling for Prioritizing Leakage Reduction Measures in AL-Zarqa, Jordan. 4th Arab Water Week, 18–23 February, Dead Sea, Jordan.

AL-Washali, T., Sharma, S., and Kennedy, M. (2016). Non-Revenue Water Evaluation in a Complicated Context: The Case of Sana'a Water Supply System. IWA Water Loss 2016 Conference, 31 January – 3 February, Bangloure, India.


Van Steenbergen F., AL-Washali, T. Aklan, M. (2018) & AL-Qubati W. Water Security in Yemen After War and Conflict: Stocktaking Report. Infrastructure and Cities for Economic Development, DFID, UK.

AL-Washali, T., AL-Derwish A., Lerebours A., Carter S., & Farrington M. (2016). WaSH Assessment in Urban Sana’a: Desk Review Report, Scoping Study of Urban WaSH. Oxfam, Yemen.

AL-Washali, T., Sharma, S. & Kennedy, M. (2016). Non-Revenue Water Breakdown in Zarqa Water Supply System. Summary Report, Jordan.

Yemen Profile in: UN-WHO (2014). Investing in Water and Sanitation: Increasing Access, Reducing Inequalities. Global Analysis and Assessment of Sanitation and Drinking Water, World Health Organization, Geneva, Switzerland.


AL-Washali, T. (2017). Damage Assessment of Water Supply in Yemen. Forgotten War Conference, 25 February, Berlin, Germany.

AL-Washali, T. (2017). The Overlooked Yemen: Call for Action, Focus on Water. Yemen The Worries Seminar, 27 January, MetaMeta Research, 's-Hertogenbosch, The Netherlands.

AL-Washali, T. (2016). Research Poster Design. Training Seminar, 25 June, Water and Environment Center, Sana’a University, Yemen

Blogs and Articles:

AL-Washali, T., Steenbergen F., Sharma, S. & Kennedy, M. (2017). Let the crisis not get hold of us: water supply in Yemen. Water Blog in Water Channel.

AL-Washali, T. M. (2015). Challenges, Achievements, and Gaps of WASH Sector in Yemen: Brief Summary of UN-WHO WASH Assessment in Yemen. AL-Miah Magazine. Issue No. 86 Print. Yemen.


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