Rockfall Hazard Classification And Mitigation System 2005
Rockfall Hazard Classification And Mitigation System 2005
Montana.Dept. of Transportation.Research Programs
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per year) Rainfall score Block size (ft) and score Fall volume (cy) and score RHRS score 386 Section number 1270 Measured sight distance (ft) AASHTO sight distance (ft) Percent decision sight distance Decision sight distance score Road width (ft) Road width score Annual rainfall (In. per year) Rainfall score Block size (ft) and score Fall volume (cy) and score RHRS score 448 Section number 1273 Measured sight distance (ft) AASHTO sight distance (ft) Percent decision sight distance Decision sigh...t distance score Road width (ft) Road width score Rating date 28-M ay-2004 Posted speed 75 1,00 Structural condition Discontinuous/ adverse 1,185 Structural cond. score 40 84 Rock friction Undulating 7 Rock friction score 16 34 DIff. erosion rates Moderate difference 12 DIff. erosion rates score 20 15 DIff. erosion features Many erosion features 5 DIff. erosion feat, score 55 5/100 Rockfall history Occasional 5 /6 History score 22 700 1,185 59 29 34 12 15 5 4/81 5 16 650 1,000 65 21 Rating date 28-May-2004 Posted speed 75 Structural condition Structural cond.
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