Instruction Manual
OCM F
page 102
OCM F - rev. 05 / 06.04.2018
Table “Manning-Strickler Coefficients”
Channel wall consistency
M [m 1/3/s]
k [mm]
S
mo
ot
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
M
oder
at
e
ly
r
oug
h
Asphalt coated steel plate
Concrete from steel or vacuum formwork, no joints,
carefully smoothened
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
R
oug
h
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
Summary of Contents for OCM F
Page 105: ...Approvals and Certificates OCM F rev 05 06 04 2018 page 105 Approvals and Certificates...
Page 106: ...Instruction Manual OCM F page 106 OCM F rev 05 06 04 2018...
Page 107: ...Approvals and Certificates OCM F rev 05 06 04 2018 page 107...
Page 108: ...Instruction Manual OCM F page 108 OCM F rev 05 06 04 2018...
Page 109: ...Approvals and Certificates OCM F rev 05 06 04 2018 page 109...
Page 110: ...Instruction Manual OCM F page 110 OCM F rev 05 06 04 2018...
