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Table 4 Assessment standard of extreme rainfall climate in cold regions

From: Analysis methodology and assessment indices of vulnerability for asphalt pavement in cold regions

Assessment Index Micro Mild Moderate Severe Extreme
Average annual rainstorm days (d) < 3 3 ~ 5 5 ~ 9 9 ~ 11 ≥11
Pavement drainage capacity Reasonable pavement drainage system and location of bridges Reasonable pavement drainage system and location of bridges, bridge aperture deviation ≤10% Poor pavement drainage system and good location of bridges, bridge aperture deviation between 10%–20% Poor pavement drainage system and unreasonable location of bridges, bridge aperture deviation between 10%–20% Inadequate pavement drainage system and deviated location of bridges, bridge aperture deviation> 20%
Terrain slope (°) < 8 8 ~ 15 15 ~ 25 25 ~ 35 ≥35
Surface incision depth (m) < 100 100 ~ 300 300 ~ 500 500 ~ 700 ≥700
Geotechnical types Hard rock Medium hard rock Soft rock Earth-rock aggregate Loose oil