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<br />. <br /> <br />important for effective floodplain zoning and <br />regulation, because administrative problems 'and <br />the need for costly and time-consuming field <br />surveys increase as map accuracy decreases. (It <br />should be noted that only maps which are enlarged <br />from small scale maps will have an accuracy <br />equivalent to that of the original, small scale <br />map. ) <br /> <br />. <br /> <br />Ratio-rectified photo background contour maps <br />with flood outlines may be distorted because of <br />topographic and structural relief. Therefore, <br />contours drawn to scale may not match the photo <br />background because of this distortion. These <br />maps must then be used with great caution when <br />establishing regulatory elevations or flood plain <br />boundaries. On the other hand, line maps showing <br />planimetric features and or tho-photo maps (see <br />glossary) are true to scale within their stated <br />accuracy. If a map meets the National Map Accu- <br />racy Standards, that fact must be stated on the <br />map. <br /> <br />-16- <br /> <br /> <br />. <br />