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Typical Manning's n values are available by right-clicking from within PC-Convey on certain screens (eg. the 'Create Cross-section' and 'Edit Multiple Manning's ns' screens).
While it is the responsibility of the User to determine appropriate Manning's n values, the following could be used as a guide:
Smooth concrete |
0.013 |
Road (pavement only) |
0.015 |
Side of house in flowpath |
0.015 |
Rockwork - smooth |
0.020 |
Earth channel - little or no grass |
0.025 |
Road (if including footpath/nature strip) |
0.025 - 0.035 |
Natural watercourse - 'less' vegetation |
0.040 - 0.080 |
Natural watercourse - 'more' vegetation |
0.090 - 0.150 |
Well-maintained grass / floodway |
0.035 |
Rock - irregular |
0.050 |
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