Interdependency of underground water – surface water in the Prut river hydrographic basin

Abstract

The article presents the data on the evolution of water quality parameters of the Prut river, taking into account the results of samplings performed in sites (on the side of Republic of Moldova) of several sections of Prut river (Criva, Sirăuți, Braniște, Valea Rusului, Sculeni, Ungheni, Valea Mare, Cotul Morii, Leuseni, Leova, Cantemir, Cahul and Giurgulești), respectively at Costești dam. The results show higher concentration of pollutants both downstream of cities that do not have waste water treatment stations and at the confluence of Prut with its tributaries. It was stated exceeding values of the maximum admissible concentration - about 1.7 times, downstream of the Leova city (Republic of Moldova) where insufficiently treated waste water is discharged. Content of Dissolved oxygen is satisfactory, reaching the minimum value of 6.3 mg / dm3 at Giurgiulesti (Cahul district, Republic of Moldova). Total content of organic substances is increasing downstream of the river, at the same times content of petroleum products recorded variations between 0.036 and 0.137 mg / dm3. Thus, the Prut river water quality was within the limits for a Class II (clean) – Lipcani – Şirăuţi section (northern part of the Republic of Moldova) and Class III (moderately polluted) – Leova sampling section (southern part of the Republic of Moldova).

Keywords

• surface water
• maximal admissible concentration
• water quality classes
• Prut river basin