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    Author(s): Kevin Bold; Pamela Edwards; Karl Williard
    Date: 2007
    Source: In: Sessions, John; Havill, Yvonne, eds. Proceedings of the international mountain logging and 13th Pacific northwest skyline symposium; 2007 April 1-6; Corvallis OR. Corvallis, OR: Oregon State University, IUFRO: 65-71.
    Publication Series: Scientific Journal (JRNL)
    Station: Northern Research Station
    PDF: View PDF  (1.13 MB)

    Description

    In 2006, 19 gravel haul roads with broad-based dips within the Monongahela National Forest were examined to determine if those dips adhered to Forest specifications for cut depth and dip outslope. Data on the azimuth, contributing road lengths, slopes of the contributing lengths, landscape position of the dip, and soil texture of the road bed materials also were recorded to identify variables that explained variation in cut depth and dip outslope. Only about 22 percent of the dips met allowable cut depth specifications, and just over half of the dip slopes met the 2-5 percent outslope specifications. Cut depth was explained primarily by road geometry variables, suggesting that proper construction is important to ensure the dip impedes longitudinal drainage down the road while remaining traversable. Dip slope was affected by environmental and use variables, so maintenance during and following use is critical to ensuring proper short- and long-term drainage.

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    Citation

    Bold, Kevin; Edwards, Pamela; Williard, Karl. 2007. A case study of an erosion control practice: the broad-based dip. In: Sessions, John; Havill, Yvonne, eds. Proceedings of the international mountain logging and 13th Pacific northwest skyline symposium; 2007 April 1-6; Corvallis OR. Corvallis, OR: Oregon State University, IUFRO: 65-71.

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