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Storm-Water Runoff Coefficients vs. Surface

Storm-water runoff coefficients for various surfaces

Typical storm-water runoff coefficients for various surfaces:

Storm-Water Runoff Coefficients vs. Surface
SurfaceRunoff Coefficient
Gardens, lawns, parks 0.05 - 0.25
Pavements, inferior block 0.40 - 0.50
Pavements, stone or brick 0.75 - 0.80
Pavements, asphalt 0.85 - 0.90
Roads, gravel 0.15 - 0.30
Roadways, macadamized 0.25 - 0.60
Roofs 0.70 - 0.95
Walks, gravel 0.15 - 0.30

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