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<br />. <br /> <br />. <br /> <br />permissible horizontal <br />tolerance related <br />to 0.3 foot vertical tolerance <br /> <br />Corresponding map <br />scale all <br />accuracy requirement(features) <br /> <br />Valley <br />slope <br /> <br />300' 1"=6000' <br />120' 1"=2400' <br />60' 1"=1200' <br />30' 1"= 600' <br />20' 1"= 400' <br />15' 1"= 300' <br />Ie;' 1"= 200' <br />Please note t:hat contours are not needed when elevations are <br />established from maps by field surveys. However, the need for surveys <br />is often dispensed with by large scale small interval contour maps <br />meeting national map accuracy standards. Contour intervals of 1 foot <br />are desirable in flat area~. A greater interval lessens usability, <br />but is still helpful. <br /> <br />0.1 <br />0.25 <br />0.5 <br />1.0 <br />1.5 <br />2.0 <br />:J,O <br /> <br />-3- <br />