Rain water is already aesthetically and bacteriologically acceptable and its independent harnessing  is widely undertaken and accepted. Methods of optimizing rain water usage should in my opinion be limited to its direct use without introduction of another role as a ''contamination dilution agent'' for waste waters. The economic benefits of such role are not apparent and I have no experience in my 40 years of work where such practice has been made. One has to treat the entire practice on a case by case basis to establish the practicality and economic sense this would make.

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Rain water is already aesthetically and bacteriologically acceptable and its independent harnessing  is widely undertaken and accepted. Methods of optimizing rain water usage should in my opinion be limited to its direct use without introduction of another role as a ''contamination dilution agent'' for waste waters. The economic benefits of such role are not apparent and I have no experience in my 40 years of work where such practice has been made. One has to treat the entire practice on a case by case basis to establish the practicality and economic sense this would make.