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4 <br />r". <br />LEGEND <br />--?. mean mows vorues <br />----- - locotiy Idgh values <br />locally low rar+o• <br />Fiqure 7a. <br />Mean annual iso-erodent (R) value-- <br />for Colorado and Wyoming (Transpos rta <br />tion Research Board. 1980) <br />SL-12 CURRENT 11MARll.wpd <br />49 <br />English units of R = foot tons/sons/how <br />Metric units. of Rin (motor tonnssAwwwre/hour) <br />1.736 s English units <br />lmodifled from Wiochmsisr. at al. <br /> <br /> <br />