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<br />I <br /> <br />~ .... ,.:. <br />i <br /> <br />Rouig'h;ness Coeffii,cients <br /> <br />Must choose in the field! <br />Subjective determination <br />Use ofBames (1967) book <br />Many local studies <br />- Arizona (Phillips and others, 1998) <br />- Idaho (Limerinos, 1970) <br />- New Zealand <br />Do not substitute equations for good <br />judgment <br /> <br /> <br />" <br />./ <br />,. <br /> <br /> <br />(:~ <br />., <br />., <br />il <br />~I <br />u <br />~~I <br />, <br />-.,~ <br />".'j <br />':1 <br /> <br />t,~ <br />, <br />i.: <br />