الفهرس 
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Abstract
The term ”pollution” as defined in common law has its widest and broadest significance, but it oertainly has a somewhat narrower meaning in the various status dealing with pollution from the scientific stand point, it is perhaps easier to regard pollution as the aotual impurity introduced into the stream rather than the act of introducing such impurity.Since pollution markedly affects the flora and fauna of the stream and can alter the individuals as well as the number of species (Yapp, 1959), it can also be defined
in relation to its effects on plant and animal life in the river It is of interest to note that in the State of California,U.S.A. (Water Pollution Control, 1952), the new control laws since 1950 made a distinction between ”contamination” and ”pollution”. if Contamination tt is r”egarded as the impairment of water quality by sewage or industrial wastes causing an actual hazard to public health or an equivalent effect,whether or not waters of.