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**** {Provides data tools for estimating chemical discharge through water systems and entering rivers} "Using computerized U.S. Environmental Protection Agency databases, which include POTW [publicly owned treatment works} flow rates and receiving water stream flows, dilution factors were determined for activated sludge, trickling filter, and primary treatments ....Using a computer program in which these curves are applied, the fraction of total POTW flow discharged to U.S. rivers and streams that will have a concentration greater than any specified value (e.g., water quality criteria) can be predicted."