Best Management Practices for Forest Road Construction and ...

Road Grade (%)Table 3Drainage Dip SpacingSpacing (feet)*2-4 300-2005-7 180-1608-10 150-140*Reduce spacing on highly erodible soilsWater BarsWater bars (Figure 6) provide needed removal of road surfacewater on inactive or closed roads.Water Bar Installation• Install water bars at a 10- to 25-degree angle downslope.• Provide a cross-drainage grade of one to two percent.• Place rock or slash below the outlet.• Space water bars more closely on steeper slopes (Table 4).15