The management of water resources, especially drinking water, is no longer the responsibility of single municipal councils or groups of councils because European Union, national and regional legislation created and appointed authorities and bodies for this purpose. Faced with a strategic problem such as the management of water resources, local government in Tuscany has the task of defining planning strategies in line with Regional law no. 65/2014. This study is part of research aimed at defining water management at province level in the framework of regional planning. The study area includes the whole Province of Siena, where we evaluated surface- and ground- water resources, during preparation of the land management plan (territorial coordination plan) of the province, with special attention to aquifers that the Regional government considers significant (Relevant Groundwater Bodies and therefore strategic for the Province. We compared the groundwater resources with the overall demand for water in the Province in order to assess the sustainability of activities determining that demand; we also evaluated the danger level and risk of contamination, defining the corresponding vulnerabilities for the whole Province. The vulnerabilities were matched with a series of rules aimed at regulating land use so as to minimise the risk of polluting groundwater.
Dopo una breve introduzione sulle origini del termalismo e delle risorse\ud geotermiche nella Toscana Meridionale, si analizzano alcune situazioni idrogeologiche nelle quali è evidente il rapporto tra acqua termale e non e depositi di travertini in Provincia di Siena.\ud (1) Acquifero carbonatico di Pian del Casone (Colle di Val d’Elsa). E’ questo un esempio di acquifero contenuto in depositi carbonatici originati da acque fredde. Si riportano i risultati di ricerche sull’acquifero ospitato nei depositi pliocenici e pleistocenici delle zona di Colle di Val d’Elsa, dove emerge anche la sorgente termale “Caldane di S. Marziale”. Vi si analizzano\ud i rapporti idrodinamici e idrochimici esistenti tra il reticolo idrografico, rappresentato dal F. Elsa e dai suoi affluenti, e le locali acque sotterranee superficiali e profonde.\ud (2) Acquifero e termalismo a Rapolano Terme. Trattasi di un acquifero\ud ospitato all’interno di depositi di travertino; si illustrano i risultati di una ricerca finalizzata all’individuazione ed allo sfruttamento non elettrico\ud dell’acqua a media e bassa temperatura nella parte centro-settentrionale della Provincia di Siena. In essa sono stati analizzati i problemi relativi ai rapporti fra le acque termali di origine profonda e quelle di una falda freatica presente nei travertini affioranti nell’area di Rapolano Terme
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