00313nam a2200121Ia 4500008004100000100001700041245007600058260001200134260001100146260000900157300000700166650001800173160118s9999    xx            000 0 und d  aDharushana,T  aWater Quality Analysis of Surface Water:Heen Ela Canal and Kelani River  aColombo  bIchemc  c2011  a54  aSurface Water