The extensive river systems of Bangladesh are fundamental to the nation's economy and way of life. The rivers flow into the Bay of Bengal. About three fourths of the water emptied into the bay is carried during the rainy season, especially June through September. Bangladesh has a tropical monsoon type of climate, with heavy summer rain and high summer temperatures. These heavy rains prevail for two to three months.
Winters are dry and cool.
Extremely high population density in Bangladesh is a factor contributing to the intense use of land, forest, and fisheries and to the water resources. Added to this pollution, fecal pollution is by far the most serious water contamination problem, while water and air pollution is causing increasing concern in the rapidly growing urban areas. A recent incident of pollution of ground water by arsenic creates an alarming situation for the country's public health. Arsenic Contamination of Ground Water Related Problems Of the three main sources of water, namely, surface water, ground water and rain water, the later two sources generally meet the most important criteria of drinking water in their natural condition. These waters are usually consumed directly without treatment.