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<br />of the total system. The second criteria proposed in (2) is that of <br />environmental quality. The environmental quality criteria can be <br />viewed as favoring alternatives that can be structured to minimize <br />adverse environmental impacts and provide opportunities for mitiga- <br />tion measures. Additional criteria that are not as formally stated <br />as United States national policy are important in decisions among <br />alternatives. A formulated flood control system must draw sufficient <br />support from responsible authorities in order to be implemented. In <br />addition, flood control systems should be formulated so that a minimum <br />standard of performance (degree of risk) is provided so that public <br />safety and welfare are adequately protected. <br /> <br /> <br />Of these criteria, only the national economic efficiency and <br /> <br /> <br />minimum performance standard have generally accepted methods available <br /> <br /> <br />for their rigorous inclusion in formulation studies. Environmental <br /> <br /> <br />quality analysis and social/political/institutional analyses related <br /> <br /> <br />to implementation have not developed technology applicable on a broad <br /> <br /> <br />scale. As a consequence these criteria must guide the formulation <br /> <br /> <br />studies but as yet, probably cannot directly contribute in a structured <br /> <br /> <br />formulation strategy. In discussions that follow, focus is of necessity <br /> <br /> <br />upon the economic criteria with acceptable performance as a constraint, <br /> <br /> <br />with the assumption that the remaining criteria will be incorporated <br /> <br /> <br />when the formulation strategy has narrowed the range of alternatives <br /> <br /> <br />to a limited number for which the environmental and other assessments <br /> <br /> <br />can be performed. <br /> <br />, <br /> <br />18 <br />