Jan Friesen is a research associate in the Department of Catchment Hydrology at the Helmholtz Centre of Environmental Research – UFZ. He has received his Ph.D. from the Delft University of Technology, The Netherlands and his diploma (M.Sc.) from the University of Bonn, Germany.His research focuses on ecohydrology, remote sensing, and sensor development, where he has authored more than 40 publications in international peer-reviewed journals and book chapters. He has extensive experience in semi-arid and data scarce countries such as Ghana, Burkina Faso, Nigeria, and Oman and his work has a strong connection to water management issues. He has worked as a guest editor to several special issues on water management. Currently, he is involved in several projects in Oman including research on submarine groundwater research and on decentralized waste water management.Since 2014 he is a member of the Arab-German Young Academy of Sciences and Humanities (AGYA) and since 2017 he serves as the German Co-President of AGYA. Leonor Rodriguez-Sinobas is a full professor of Hydraulic and Hydrology Engineering at the Agricultural Engineering School of Madrid, Universidad Politécnica de Madrid. She also received a M.Sc. at Davis California University, USA.Her academic and scientific contributions focus on the design and management of irrigation systems, and on water resources to improve the sustainability of irrigated areas. The results of her work have been published in more than 60 publications in international peer-reviewed journals and book chapters. Likewise, she has contributed as a Guess Editor in four Special issues in Elsevier and in American Society and Civil Engineering journals.She is currently collaborating with the program “Science without Frontiers” funded by the Education Ministry of Brazil since 2011 and she has signed “Memorandum of Understanding” with the Ecological and Biological Dept. at Oregon State University and with the Demirel-Suleyman University in Turkey. In addition, she has participated and coordinated projects from the Spanish Research Agency and European Union and is involved in strategies for continuum learning education in hydraulic and hydrology matters.

• 1. Citizen Science and Low-Cost Sensors for Integrated Water Resources ManagementJonathan D. Paul and Wouter Buytaert2. Urban Forestry: An Underutilized Tool in Water ManagementJohn T. Van Stan, S. Jeffrey Underwood, and Jan Friesen3. Water Accounting for Integrated Water Resources Management: Experiences and RecommendationsAndrea Momblanch, María Pedro-Monzonís, Abel Solera, and Joaquín Andreu4. Valuation of Guadalquivir River Basin Water Resources (southern Spain) Using SEEA-WaterMaría M. Borrego-Marín, Carlos Gutiérrez-Martín, and Julio Berbel5. Applying Water Accounting Methods Through Statistical Data and Simulation Models: The Duero Transboundary WatershedDavid J. Vicente, Leonor Rodríguez-Sinobas, Luis Garrote, and Raúl Sánchez6. A National Scale Planning Tool for Agricultural Droughts in GermanyMatthias Zink, Luis Samaniego, Rohini Kumar, Stephan Thober, Juliane Mai, David Schäfer, and Andreas Marx7. Forecasting Changes in Agricultural Irrigation Demand to Support a Regional Integrated Water Resources Management StrategyJerry W. Knox, David Haro-Monteagudo, Tim Hess, and Joe Morris8. Managed Aquifer Recharge as a Tool to Enhance Sustainable Groundwater Management in California: Examples from Field and Modeling StudiesHelen E. Dahlke, Gabriel T. LaHue, Marina R.L. Mautner, Nicholas P. Murphy, Noelle K. Patterson, Hannah Waterhouse, Feifan Yang, and Laura Foglia