Hydrological Balance and Water Resource Availability: 2025 Update, Seasonal Forecasts and Climate Projections
Mar 24, 2026 09:00 AM — Mar 24, 2026 01:30 PM Rome, ISPRA headquarterOn the occasion of the celebration of World Water Day, ISPRA intends to present the 2025 update of the estimates of the components of the hydrological balance and the natural availability of renewable water resources provided by the BIGBANG model – GIS-Based Hydrological Balance at the National Scale on a Regular Grid. The presentation will also include assessments of the 2025 drought conditions and long-term hydro-climatic statistics.
The BIGBANG assessments at the national and river basin district scale for total precipitation, evapotranspiration, aquifer recharge, and water resource availability (the so-called “internal flow”) constitute the official national data for the WISE SoE – Water Quantity (WISE-3) data flow and for the evaluation of the Water Exploitation Index Plus (WEI+), within the framework of the Water Framework Directive 2000/60/EC, as well as for the reporting requirements of the OECD/Eurostat Joint Questionnaire on Inland Waters.
Furthermore, starting from the National Statistical Programme 2023–2025, the National Hydrological Balance indicators produced through the BIGBANG model constitute official statistics within SISTAN – the National Statistical System.