Figure 4. Erosion hazard for unsurfaced roads and trails. Orange = severe, light green = moderate, green = slight. Map scale is 1:20,000 (Web Soil Survey 2009). Table Erosion hazard for unsurfaced roads and trails by soil map unit (Web Soil Survey 2009). Map Map unit Rating Component Rating reasons Acres Percent unit name name (numeric values) in of AOI symbol (percent) AOI BnC Boone Moderate Boone 93 24.30% sand, 6 to (100%) (0.50) 12 percent slopes BnD Boone Severe Boone Slope/erodibility 3.6 1.00% sand, 12 to (100%) (0.95) 25 percent slopes BpF Boone-Rock Severe Boone Slope/erodibility 108.6 28.40% outcrop (60%) (0.95) complex, 25 to 45 Rock Slope/erodibility percent outcrop (0.95) slopes (40%) Slope/erodibility (0.95) CoB Coloma Slight Coloma 29.3 7.60% sand, to (100%) 6 percent slopes CoC Coloma Moderate Coloma 34.1 8.90% sand, 6 to (100%) (0.50) 12 percent slopes
Figure 4. Erosion hazard for unsurfaced roads and trails. Orange = severe, light green = moderate, green = slight. Map scale is 1:20,000 (Web Soil Survey 2009). Table Erosion hazard for unsurfaced roads and trails by soil map unit (Web Soil Survey 2009). Map unit symbol Map unit name Rating Component name (percent) Rating reasons (numeric values) Acres in AOI Percent of AOI BnC Boone sand, 6 to 12 percent slopes Moderate Boone (100%) (0.50) 93 24.30% BnD Boone sand, 12 to 25 percent slopes Severe Boone (100%) Slope/erodibility (0.95) 3.6 1.00% BpF Boone-Rock outcrop complex, 25 to 45 percent slopes Severe Boone (60%) Slope/erodibility (0.95) 108.6 28.40% Rock outcrop (40%) Slope/erodibility (0.95) Slope/erodibility (0.95) CoB Coloma sand, to 6 percent slopes Slight Coloma (100%) 29.3 7.60% CoC Coloma sand, 6 to 12 percent slopes Moderate Coloma (100%) (0.50) 34.1 8.90%
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