. Effect of logging roads on sediment production rates in the Idaho Batholith. Figure 8. —Surface erosion on road fills con- structed from granitic materials 1 year after the entire 6-year study period. Fredriksen (1970) reported similar slides on roads in steep, unstable terrain in western Oregon. Major failures of this type are not related to surface erosion rates, but rather tend to occur during large climatic events on those areas where the potential exists. As with surface erosion, much mass erosion of road fills can be avoided by careful location, design, construction, and
. Effect of logging roads on sediment production rates in the Idaho Batholith. Figure 8. —Surface erosion on road fills con- structed from granitic materials 1 year after the entire 6-year study period. Fredriksen (1970) reported similar slides on roads in steep, unstable terrain in western Oregon. Major failures of this type are not related to surface erosion rates, but rather tend to occur during large climatic events on those areas where the potential exists. As with surface erosion, much mass erosion of road fills can be avoided by careful location, design, construction, and maintenance measures. Gonsior and Gardner (1971) listed guidelines for this purpose based on studies of slope failures in the vicinity of the Zena Creek logging study. Table control on road fills in the Idaho Batholith Percent Stabilization measures1 : Road location : change in : References : erosion2 None (except seed + fertilizer) Bogus Basin + 15 Bethlahmy and Kidd 19663 Planted ponderosa pine Deadwood River -47 Unpublished data4 Wood-chip mulch Bogus Basin -61 Bethlahmy $ Kidd 1966 Straw mulch Zena Creek -72 Ohlander 1964 Jute netting Zena Creek -93 Ohlander 1964 Asphalt - straw mulch Zena Creek -97 Ohlander 1964 Straw mulch + netting + Deadwood River -98 Unpublished data4 planted ponderosa pine Straw mulch + netting Bogus Basin -99 Bethlahmy and Kidd 1966 Al 1 measures except trees include items shown + grass seed and fertilizers. As compared to untreated control plots. 3Erosion was increased by 15 percent, possibly by the method of applying seed and fertilizer. 40n file at the Station's Forestry Sciences Laboratory in Boise, Idaho. 12. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Megahan, Walter F. cn; Kidd, Walter J. Ogden, Utah : Intermountain Forest & Range Experiment Station,
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