Difference between revisions of "Manning's n"
Jump to navigation
Jump to search
Jenny Hill (talk | contribs) m |
|||
| (2 intermediate revisions by one other user not shown) | |||
| Line 1: | Line 1: | ||
| − | {| class="wikitable" | + | {|class="wikitable" |
|- | |- | ||
| − | |+ Manning's | + | |+ 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> |
|- | |- | ||
| − | ! | + | !n value range |
!Good condition turf grass | !Good condition turf grass | ||
!Other | !Other | ||
| Line 23: | Line 23: | ||
|bushy willow trees about 1 year old inter-grown with weeds along side slopes (all vegetation in full foliage) | |bushy willow trees about 1 year old inter-grown with weeds along side slopes (all vegetation in full foliage) | ||
|} | |} | ||
| + | |||
| + | ==References== | ||
Revision as of 12:56, 5 July 2022
| n 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) |
References
- ↑ 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