Drought and water scarcity are important issues in many regions of the globe, requiring innovative hydrological monitoring, modelling and forecasting to evaluate the complex impacts on the availability and quality of water resources. While drought describes a natural hazard, water scarcity is related to long-term unsustainable use of water resources and associated socio-economic aspects. Both phenomena are, however, closely linked, with the complex interrelationship requiring careful attention.

While an increase in the severity and frequency of droughts can lead to water scarcity situations, particularly in regions that are already water stressed, overexploitation of available water resources can exacerbate the consequences of droughts. In the worst case this can lead to long-term environmental and socio-economic impacts. Particular attention should, therefore, be paid to the feedbacks between these two phenomena, including the potential impact of climate change.

It is therefore necessary to improve the medium to long-term predictive skills for both droughts and water availability and to develop innovative indicators and methodologies for enhancing the early warning capability of drought monitoring and forecasting systems. Such systems are important for sound decision making at all spatial scales.

The session will address statistical and/or physically-based modelling techniques, aimed at monitoring and medium to long-term forecasting of hydro-meteorological variables that describe and govern situations of drought and/or water scarcity. Examples are temperature and heat waves, precipitation, snow cover, soil moisture, streamflow and groundwater. The translation of these variables into indicators meaningful for decision making and ways of presenting these to relevant water management and policy levels are further issues to be addressed.

The session aims to bring together scientists and practitioners in the fields of hydrology and meteorology as well as stakeholders and practitioners in the field of water resources management, interested in monitoring, modelling and forecasting the interrelationships between drought and water scarcity and their hydrological impacts.

Particularly welcome are applications and real-world case studies in regions subject to significant water stress, where the importance of forecasting long-term water resources availability is likely to become more important in the future.