Table 8-1.-Recommended Contour Intervals–Topographic MapCuts and fills are man-made features that resultwhen the bed of a road or railroad is graded or leveledoff by cutting through high areas and filling in low areasalong the right-of-way (fig. 8-28).A vertical or near vertical slope is a cliff. Asdescribed previously, when the slope of an inclinedsurface increases, the contour lines become closertogether. In the case of a cliff, the contour lines canactually join, as shown in figure 8-29. Notice the tickmarks shown in this figure. These tick marks alwayspoint downgrade.MAP SCALES AND CONTOUR INTERVALSA topographicintermediate scale,following criteria:Large scale:Intermediate scale:Small scale:The designatedmap is calledor small scaleeither large scale,by the use of the1 inch= 100 feet or lessany scale from 1 inch= 100 feetto 1 inch= 1,000 feet1 inch= 1,000 feet or more.contour interval varies with thepurpose and scale of the map and the character of theterrain. Table 8-1 shows the recommended contourintervals that you may use to prepare a topographicmap.Figure 8-28.-Contour (cut and fill).8-20
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