Table 2 Criteria for structural grading of underlayment.

From: Characterization of extreme rainfall changes and response to temperature changes in Guizhou Province, China

Slope/°

DEM/m

Aspect/°

 < 5 (Level 1)

 < 200 (Level 1)

22.5–67.5 (Northeast)

5–15 (Level 2)

200–500 (Level 2)

67.5–112.5 (East)

15–25 (Level 3)

500–1000 (Level 3)

112.5–157.5 (Southeast)

25–35 (Level 4)

1000–2500 (Level 4)

157.5–202.5 (South)

 > 35 (Level 5)

 > 2500 (Level 5)

202.5–247.5 (Southwest)

–

–

247.5–292.5 (West)

–

–

292.5–337.5 (Northwest)

–

–

337.5–22.5 (North)

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