Dear Colleagues,

Water resources management requires responsible, forward-looking, and far-sighted planning to provide and secure the vital resource “water” in sufficient quantity and quality, thereby also taking into account ecological aspects. Climate change, the associated increases in variability or the increased occurrence of extremes in components of the water cycle, and population growth as well as economic developments will increase the pressure on water resources in the future. Apart from these long-term planning horizons, water resources management also has short- and mid-term planning dimensions, e.g., regarding flood warning systems or seasonal or annual planning of reservoir management. Here, hydrometeorological information systems can provide a valuable basis for making decisions.

Hydrological and meteorological point observations build the basis of essential information for planning water resources and, at the same time, also provide evidence for changes in the water cycle due to climate change. However, these observation networks are decreasing globally, especially in countries or regions where the terrestrial monitoring networks or data storage and management are in poor condition due to political and administrative structures or financial constraints and hydrometeorological time series are not available, cannot be accessed, or exhibit substantial gaps. Single- or few-point measurements are also frequently used to estimate hydrometeorological conditions of a larger area and may, at the same time, not be representative for the larger domain. This is especially the case for mountainous regions with complex terrain.

In recent decades, alternative data sources and methods have become available. The increased availability of remote sensing-derived products on hydrometeorology, e.g., on fluxes like precipitation or system states like soil moisture, improvements in the spatiotemporal resolution of hydrological models, and advances in parameter calibration or hydrological information systems have advanced the information basis for water resources management. In the context of “Observations in Water Resources”, this Special Issue seeks contributions reflecting these novel aspects. These can range from gap-filling, regionalization, and interpolation methods of meteorological variables, hydrological information systems, remote sensing or re-analysis products used in hydrology and water management, or the spatiotemporal development of observation networks for single countries, regions, or globally. Additionally, innovative methods for the estimation of water demands are also welcome.

Dr. Mathew Herrnegger
Guest Editors

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• hydrometeorological observation networks
• remote sensing hydrology
• satellite precipitation products
• hydrological information systems
• re-analysis