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{| class="wikitable"
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|+ Manning's 'n' of vegetated surfaces <ref>Arcement, G.J., Schneider, R. Guide for Selecting Manning's Roughness Coefficients for Natural Channels and Flood Plains U.S.G.S. WATER-SUPPLY PAPER 2339, 1989 http://eh.sdsu.edu/usgs_report_2339.pdf Accessed Dec 19 2017</ref>
<ref>Arcement, G.J., Schneider, R. Guide for Selecting Manning's Roughness Coefficients for Natural Channels and Flood Plains U.S.G.S. WATER-SUPPLY PAPER 2339, 1989 http://eh.sdsu.edu/usgs_report_2339.pdf Accessed Dec 19 2017</ref>
|-
!Value range
!Good condition turf grass
!Other
|-
!0.002 - 0.010
|Where the average depth of flow is at ≥ 2 times the height of the vegetation
|Supple tree seedlings such as willow or cottonwood growing where the average depth of flow is at ≥ 3 times the height of the vegetation
!0.010 - 0.025
|Where the average depth of flow is between 1 - 2 times the height of the vegetation
|Moderately dense weeds, or tree seedlings growing where the average depth of flow is from 2 -3 times the height of the vegetation
!0.025 - 0.050
|Where the average depth of flow is about equal to the height of the vegetation
|8- to 10-year-old willow or cottonwood trees inter-grown with some weeds and brush (none of the vegetation in foliage)
!0.050 - 0.100
|Where the average depth of flow is < 0.5 times height of the vegetation
|bushy willow trees about 1 year old inter-grown with weeds along side slopes (all vegetation in full foliage)
|}