positive and negative impacts of dams on the environment pdf

Dams alter aquatic ecology and river hydrology upstream and downstream, affecting water quality, quantity and breeding grounds (Helland-Hansen et al., 1995).They create novel and artificial types of aquatic environment for the life span of the dam. The environ-mental impacts of the dams have been written down below in numerical order. Dams have a great deal of positive and negative effects on the environment. Studies have shown that flooding in dams submerges existing vegetation which over time decays and produces methane gas which is classified to be among the most detrimental greenhouse gasses. However, dams and their reservoirs have been linked to global warming. Dams have a huge role to play in such treatments. These are; 1. The positive and negative effects of dams have been stated as follows.

H‰TP»nÄ ìùŠ-¥ |¹Îrs—ÂEŠ�ô,Rh�ÿ}€³î”ĞÌì,³ËOı¹÷.ÿ  L`�7„KXI#\prdÆé´£zëYEàÙ. 3. Dams and reservoirs are synonymous with hydropower production. IMPACTS OF DAMS ON RIVERS. THE POSITIVE AND NEGATIVE IMPACTS OF DAMS ON THE ENVIRONMENT While preparing the water resources projects, it is important to make clear what the environmental impacts of the project may be when it is executed. The reservoir can also be a source of water to animals and plants in the adjoining areas and, where such areas have become unnaturally dry, this can be a significant environmental benefit. Hydropower is usually termed as one of the most environmentally friendly sources of energy. Positive Effects of Dams: The positive effects of dams have been mentioned as follows. The creation of a reservoir provides a habitat for wetland species, especially water birds. These benefits were not includ… örÃuÙç�Yæ ›9Óá÷@šÄa|ÂÀ¤˜À2¾Lw@~FSCiwa¨§�E†7ÈÍL÷Az „?v� endstream endobj 137 0 obj 372 endobj 99 0 obj << /Type /Page /Parent 82 0 R /Resources 100 0 R /Contents [ 112 0 R 114 0 R 116 0 R 118 0 R 120 0 R 126 0 R 128 0 R 130 0 R ] /Thumb 55 0 R /MediaBox [ 0 0 595 842 ] /CropBox [ 0 0 595 842 ] /Rotate 0 >> endobj 100 0 obj << /ProcSet [ /PDF /Text ] /Font << /TT2 101 0 R /TT4 104 0 R /TT5 103 0 R /TT6 107 0 R /TT8 108 0 R /TT10 124 0 R /TT12 121 0 R >> /ExtGState << /GS1 133 0 R >> >> endobj 101 0 obj << /Type /Font /Subtype /TrueType /FirstChar 32 /LastChar 146 /Widths [ 315 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 743 734 769 808 678 616 822 824 373 0 0 616 907 789 854 653 854 741 681 618 771 711 986 715 708 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 315 ] /Encoding /WinAnsiEncoding /BaseFont /SouvenirITCbyBT-Demi /FontDescriptor 109 0 R >> endobj 102 0 obj << /Type /FontDescriptor /Ascent 938 /CapHeight 718 /Descent -222 /Flags 32 /FontBBox [ -101 -270 1130 980 ] /FontName /PENKPI+TrebuchetMS-Bold /ItalicAngle 0 /StemV 133 /FontFile2 132 0 R >> endobj 103 0 obj << /Type /Font /Subtype /Type0 /BaseFont /PENKPH+TrebuchetMS-Bold /Encoding /Identity-H /DescendantFonts [ 135 0 R ] /ToUnicode 106 0 R >> endobj 104 0 obj << /Type /Font /Subtype /TrueType /FirstChar 32 /LastChar 32 /Widths [ 250 ] /Encoding /WinAnsiEncoding /BaseFont /TimesNewRoman,Bold /FontDescriptor 105 0 R >> endobj 105 0 obj << /Type /FontDescriptor /Ascent 891 /CapHeight 0 /Descent -216 /Flags 34 /FontBBox [ -558 -307 2000 1026 ] /FontName /TimesNewRoman,Bold /ItalicAngle 0 /StemV 133 >> endobj 106 0 obj << /Filter /FlateDecode /Length 231 >> stream Positive impacts related to Catchment: For the clearance of the environment, many treatments of the catchment area have been carried out.

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