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s <br /> I� <br /> TABLE 1 <br /> BLM ROAD AND DISTURBED AREA STANDARDS AND SPECIFICATIONS <br /> ROADS <br /> Water Bar Spacing* <br /> Road Grade Water Bar Spacing <br /> 2% 200 ft. <br /> 2 -4% 100 ft. <br /> 4-51 75 ft. <br /> 5 -7% 50 ft. <br /> *Unstable soils may require closer. spacings while <br /> rock outcroppings may not-require water bars . <br /> All water bars will be constructed to drain freely <br /> to the natural ground level and prevent siltation <br /> and clogging. <br /> DISTURBED AREA <br /> Slope <br /> 3-:1. Contour ditches ,constructed at .a .l to .2$ slope and <br /> will extend into natural drainage patterns or <br /> flatter slopes . ConstructiOn. standards : bottom <br /> width 3-4" and lh-2 .ft., freeboard, maximum distance <br /> between contours 25 ft. <br /> 3 :1- Terraced construction standards : width equals blade <br /> 1 :1 wi-d- 5-ut not less ..than 10 ft. , slope 1-21 for <br /> drainage and be inclined .1-2 ft. toward cut slope; <br /> distance between terrace will be 10-12 ft. <br />