ABSTRACT
Point source effects on biological communities of great rivers are relatively unexplored aspects of pollution control and prevention. Due to the large volume of water great rivers move, effluent mixing zones are typically extremely short (ORSANCO and Ohio River Users Group, 1999). Therefore, any immediate effect of the outfall on organisms residing in the river is generally slight and hard to quantify. It is necessary to examine biological community response in the smallest possible segments that will consistently show impairment trends.
