Study Area

The Bistrita River (283 km length) is one of the main tributaries of the Siret River, which is the second affluent of the Danube River in terms of discharge and basin surface. The Bistrita River Basin has an area of 7039 km2 and its contribution to the Siret discharge represents more than 30%. The mean altitude of the basin is 919 m.

The springs of the Bistrita River are located in the Rodna Mountains, being obtained through the confluence of the Bistricioara and Putreda rivers. Due to the great number of the hydrotechnic reservoirs, the Bistrita River represents an example of rationale hydrographic valorification. The most important reservoir of the basin is the Izvorul Muntelui reservoir which has a total volume of 1130 million m3.

The discharge has an important value all time of the year, especially in the summer and autumn when the waters of the Bistrita river and its tributaries are used for the transportation of the wood. The vegetation is specific to the mountains region, more than 70% of the Bistrita river flowing through the mountains and hills.

The annual reports on water quality of the Bistrita basin show high concentrations of ammonium, organic matter, nitrates and suspended matter at the basin outlet. The last 2 km of the Bistrita river (final section before the basin outlet) are degraded, which influences also. Human activities, such as discharge of wastewater have disturbed the natural fluxes between the nitrogen and phosphorous, resulting in increased nutrient levels in surface waters. A great percent of the total wastewater stations (> 50%) function improperly.

The groundwater quality is also affected by the interaction with surface waters. The annual reports of the Bistrita water authority show the increase of the ammonium, nitrates, organic matter and phosphates concentrations especially in two areas: Bacau and Piatra Neamt cities, due to human activities. An important consequence is the decrease of drinking water resources.