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The Regional Hydrological Bulletin is an operational instrument studied to supply quantitative hints of the Piedmont Region main hydrological river basins state with simple and exhaustive communication modalities. The aim is to evidence the potential established of drought conditions and the insufficient availability of water resource on a regional territory. In order to realize this tool finalized to support the water resource management, contents, methodologies and an appropriate language have been developed, in a framework of climatologic reference. Moreover, the Bulletin supplies, through the statistic analysis of the SPI (Standardized Precipitation Index), an assessment of the short-term drought conditions over river basin spatial scale. This monitor includes all the resources flowed to the environment system in terms of rain volumes, water reservoirs stored in the not-perennial snowy mantle and the streaming capacities of the main watercourses [ABSTRACT FROM AUTHOR]