DISSOLVED OXYGEN AND BOD ASSIMILATIVE CAPACITY OF THE SELBE RIVER

Abstract

Mongolia is a landlocked country in Central Asia with a land area of 1’564’116 square km that shares borders with both China and Russia to the north and south, respectively. The total surface water source in Mongolia is around 599 𝑘𝑚3 , about 0.00004% of the world’s total water resource. 83.7% of it is accumulated in lakes, 10.5% in glaciers, and 5.8% in river and river systems. (1) Water source in Mongolia is limited and unevenly distributed throughout the whole country, most of the surface water sources are located in Northern Mongolia, as for the Gobi Desert zone majority of the water source is from groundwater.