As for the water resources, the situation on river basins is the following: river basins with excedentary resources – The Upper Tisa, Somes, Crisurile, Nera, Cerna, Jiu; balanced resources – The Mures, Olt; deficitary resources – The Bega – Timis – Cerna – Cras, Vedea, Arges, Ialomita, Siret, Prut, secondary tributaries of the Danube, the rivers of Dobrudja (Gastescu, Rusu, 1980).
The deficitary character of the Siret and the Prut river basins has been
more obvious in the last ten years (1991-2000), even if the water require- ments have decreased. That is why the aridization character is more and more obvious also (Soroceanu, Amariucai, 1997). In order to support this statement we can mention the continuous diminution of average amounts of precipitation with annual averages less than 400mm: Iasi 355mm, Galati 377mm, Negresti 312.5mm or even under 300 mm: Tecuci 296.4mm in 2000. The situation of ensuring the water resources for the last years (1990-2001) is relatively good, but not really satisfactory from a strictly economic point of view. The evolution of requirements and effective drawing of water for this period recorded a continuous decrease due to the decline of the economic activities, to the reduction of water consumption in the technological proc- esses, to the diminution of the losses and the application of a more adequate economical mechanism in the water management (Sofronie, 2002). The special temporal variability of the water flowing through the river
valleys represents a main feature of the hydrographical basins in the Molda- vian Plateau. The most important indicator, in this respect, is represented by the ratio between the maximum flow and the minimum flow (torrentiality). For the territory of Romania the minimum value is that of the Danube (Ceatal Is- mail) with 11.4, while for some rivers in the east of Romania (the Barlad), this ratio can reach the value of 76,000. For the arteries that get dry during the year, these values are even higher, tending to the infinity. The total number of inhabitants within the two river basins is different:
the Siret, with 3,982,798 inhabitants and the Prut river basin with 1,414,723 inhabitants (table 10). The total number of people is therefore 5,397,521 (Muntele, 2004).
During one year, the volume of water of the two main rivers, at the
river mouths, cannot be significant in order to be divided to the total number of inhabitants. For the Siret river this water volume is of 732 mil.m3 (Lungoci), and for the Prut it is of 1,403 mil.m3 (Oancea). In this case the following re- sults are obtained: 183.79 m3/
year.inhabitant in the Siret river and 991.71 m3/
year.inhabitant for the Prut river. Unfortunately, for the Prut river only half of this value should be considered (as 50% is distributed to the Republic of Mol- davia). In this respect, we have to mention the fact that the Prut river must keep a permanent ecological flow of minimum 10m3/s. Therefore, the result is of only 494.9 m3/
year.inhabitant. For small rivers, the flow at the river mouths can be lower than those in the upper course, as a result of water use in the house-holds.
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