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Abstract
A water pollution code must quantitatively express the amount and locations of allowable waste discharge. To do this each of the steps leading to the decision on allowable waste discharge must be defined and quantified. Six of the steps are defined in this report and techniques for quantitatively representing them are discussed. The movement of materials from man's environment back into the natural environment is described by five steps: waste generation, waste treatment, waste transport, waste interaction and waste decay. The sixth step discussed in this report represents the impact of the wastes on the natural system. Two further steps in deciding allowable waste discharges will be treated in Parts II and III of this paper which will appear in the next two issues of the Journal.