Dr Maggioni, is Assistant Professor of Environmental and Water Resources Engineering at George Mason University. At George Mason University she leads an active and interdisciplinary team of graduate and undergraduate students, investigating a wide variety of topics including monitoring and modeling storm water quantity and quality at the Mason main campus with state-of-the-art sensor networks, as well as combining water resources engineering with hydrometeorology and remote sensing using satellite data to evaluate conditions in regions, where direct observation is impossible, but the environmental consequences can be devastating. Christian Massari, PhD, is permanent researcher at the Research Institute for the Geo-Hydrological Protection (IRPI) of the National Research Council (CNR) of Italy. Thanks to a graduate research fellowship, he spent a year in the Department of Hydrology and Water Resources at the University of Arizona, Tucson, AZ in 2011. After returning to Italy, he was a postdoctoral research fellow in the hydrology and remote sensing group at IRPI, where he is a permanent researcher since January 2017. His research interests include data fusion and data assimilation of hydrological variables (e.g., soil moisture and rainfall), hydro-validation of satellite soil moisture and rainfall observations, filtering of satellite soil moisture, flooding risk analysis, and flood frequency assessment.