About Arnejan van Loenen

Mr van Loenen is an expert in operational water management and serves as Regional Manager Asia/Pacific at Deltares, where he coordinates activities across the region.

Since graduating in 2005, Mr van Loenen has specialised in the design and development of operational flood forecasting systems. He initially worked with Dutch water authorities, including the regional Water Boards and Rijkswaterstaat, before expanding his focus to support national agencies in Asia in strengthening their flood forecasting capabilities. In this context, he has worked extensively in Thailand, Vietnam, Indonesia and Cambodia.

From 2017 to 2019, Mr van Loenen was based in Indonesia, where he led a capacity-building programme aimed at transferring knowledge of advanced water management tools. During this period, he also contributed to the development of a baseline study for an end-to-end multi-hazard early warning system platform and explored how emerging technologies can be leveraged to improve flood risk management.

Between 2020 and 2023, Mr van Loenen lived in the United States, supporting river forecasting centres and hydropower utilities in both the US and Canada in improving their operational performance. He gained extensive experience with state-of-the-art forecasting practices and worked on the implementation of advanced optimisation techniques for hydropower scheduling.

Following his return to the Netherlands in 2023, he became Regional Manager for the US and Canada. In April 2026, he assumed the role of Regional Manager Asia/Pacific, returning to a region where he has built strong professional ties throughout his career.