행복해1 2010. 2. 18. 13:58

출처:인터넷

Surface Material Manning's Roughness
Coefficient
- n -
Asbestos cement 0.011
Asphalt 0.016
Brass 0.011
Brickwork 0.015
Cast-iron, new 0.012
Clay tile 0.014
Concrete - steel forms 0.011
Concrete - finished 0.012
Concrete - wooden forms 0.015
Concrete - centrifugally spun 0.013
Copper 0.011
Corrugated metal 0.022
Earth 0.025
Earth channel - clean 0.022
Earth channel - gravelly 0.025
Earth channel - weedy 0.030
Earth channel - stony, cobbles 0.035
Floodplains - pasture, farmland 0.035
Floodplains - light brush 0.050
Floodplains - heavy brush 0.075
Floodplains - trees 0.15
Galvanized iron 0.016
Glass 0.010
Gravel 0.029
Lead 0.011
Masonry 0.025
Metal - corrugated 0.022
Natural streams - clean and straight 0.030
Natural streams - major rivers 0.035
Natural streams - sluggish with deep pools 0.040
Plastic 0.009
Polyethylene PE - Corrugated with smooth inner walls 0.009 - 0.015
Polyethylene PE - Corrugated with corrugated inner walls 0.018 - 0.025
Polyvinyl Chloride PVC - with smooth inner walls 0.009 - 0.011
Steel - Coal-tar enamel 0.010
Steel - smooth 0.012
Steel - New unlined 0.011
Steel - Riveted 0.019
Wood - planed 0.012
Wood - unplaned 0.013
Wood stave 0.012