The developments in water pollution control legislation and their interpretation are discussed in the context of the current need to establish flexible operational control hierarchies reflecting conflicting uses of surface waters and overall basin economy. Fussy logic is proposed as a technique to aid the reconciliation of within-plant and within-receiving water operational targets with the consistent interpretation of statutory requirements. An example simulation of the control of a waste-water treatment plant to meet time-varying river water quality objectives is presented in support of the argument.

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