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is a flexible and parsimonious user-friendly approach supporting Water Supply Systems (WSS) monthly mass balance considering climate variability, infrastructures and multiple allocation options.

The user can easily build, within a QGIS project, a water supply scheme selecting water resources among surface inflows from watershed, surface reservoirs , wells , springs and Alternative Water Sources (AWS) (e.g. desalinisation plant) and connecting them to one or more macro-USER that can be prioritized. Management nodes allow to connect a macro-user to more than one resources, proposing different pre-implemented management options. Each element is fed by simple excel files following given templates.

proposes built-in simple robust approaches for the time series reconstruction of water resources availability and users’ needs, but time series resulting from external modelling can be supplied as an optional for each element.

Once implemented the WSS (if ready with the files prepared and the scheme in mind, it may take few hours to few minutes), provides hindcast simulation (reproducing the past decades) for evaluation and “what if” management scenarios, stochastic simulation for robust drought index estimation and early warning decision support and climate scenarios simulation for impact and adaptation studies, together with build-in plotting and export tools.

As it is easy to implement, flexible and data parsimonious, ideally supports common management and adaptation solutions and WSS inter-comparison within a transparent shared data and modelling approach. As it is open, may grow up and adapt toward your needs, filling the voids, like water.