The last climatic years have recorded a recrudescence of risk phenomena, especially floods and droughts. Because of this reason an acute shortage of water is presently felt even in the mountainous areas. Hydrological data have been recorded at 5 gauges distributed in the middle and lowers sectors of the basin. Suha river basin includes a large number of inhabitants, attracted here some time ago by mining exploitations. The closing of Ostra mine has not led to a decrease in population, and thus water demands are higher and higher and underground resources are used. Minimum discharge in the basin is extremely low in comparison to the reality of other mountain catchments (at Stulpicani gauge a mean minimum discharge of 0.611 m(3)/s has been recorded during 1970-2013). This situation is due first of all to the rapid infiltration of water in the very permeable deposits (sands, gravels, boulders). An increase in water demands is probable if the comfort of the dwellings is improved by raising the number of baths and showers, of greenhouses for vegetables growing, of guest-houses with pools etc. In order to preserve water resources in the area is imposed the keeping of the present forested surfaces and the adequate control of tailings dumps so as to avoid underground and surface water pollution. Due to practices like toilets lacking septic tanks or gathering of manure on un-isolated platforms, the conservation of present water quality (especially the underground one) is imperious.