Instruction Manual
OCM F
Page 96
OCM F - Rev. 04 as of 18.02.2014
®
14 Table „Manning - Strickler Coefficients“
Channel wall consistency
M in m
1/3
/s
k in mm
smoot
h
glass, PMMA, polished metal surfaces
> 100
0...0,003
plastic (PVC, PE)
new steel plate with protective coating;
smoothened cement plaster
≥
100
0,05
0,03...0,06
moder
at
el
y
roug
h
asphalt coated steel plate;
concrete from steel or vacuum formwork, no joints, carefully smooth-
ened;
planed wood, joint-free, new;
asbestos cement, new
90...100
0,1...0,3
smoothened concrete, smooth finish;
planed wood, well-joint
85...90
0,4
0,6
concrete, good formwork, high cement contents
80
0,8
rough
non-planed wood; concrete pipes
75
1,5
hard-burned bricks, carefully joint;
well-manufactured ashlar facing;
concrete from joint-free wooden formwork
70...75
1,5...2,0
rolling-cast asphalt finish
70
2
ashlar masonry, well-manufactured;
moderately incrusted steel pipes;
non-finished concrete, wooden formwork;
squared stones; old and swelled wood;
cement walls
65...70
3
non-finished concrete; old wooden formwork;
brickwork, no joints, finished;
dry stone wall, less carefully manufactured;
soil material, smooth (fine-grained)
60
6
Rougher surfaces are difficult to measure under hydraulic aspects and hence are not described here
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