The Manning's roughness coefficient used the Manning's equation calculate flow open channels. . Polyvinyl Chloride PVC - smooth walls: 0.009 - 0.011: Rubble Masonry: 0.017 - 0.022: Steel - Coal-tar enamel: . Dimensions threaded ductile-iron pipe AWWA C115. AWWA C151 - Ductile-Iron Pipe Centrifugally Cast .
The coefficient roughness ("n") the equation called "Manning's number," "Manning's "n" factor," "Manning's n" short. coefficient a function the characteristics the pipe's surface - smoother surface, lower coef-ficient the greater flow.
Plastic, PVC, Polyethylene pipe tubing 160/150 150-155 150 Cement mastic lined iron steel pipe 160/130 148 140 Copper, brass, lead, tin . Manning's Equation roughness coefficient (n) Material Values n Range Typical Design Polyethylene pipe 0.008-0.011 0.009 Uncoated cast ductile
Relative roughness friction factors new, clean pipes for flow 60°F (15.6°C) water (Hydraulic Institute Engineering Data Book, Reference 5) (1 meter 39.37 = 3.28 ft). Figiure 1, Click image enlage Where: = friction factor = Diameter (inches) ε / = Relative Roughness ε = Measure pipe wall roughness feet (meters)
L 5 pipe length, ft 5 coefficient roughness (Manning's equation Kutter's formula), dimensionless P 5 wetted perimeter, ft P 1 5 maximum pressure, psi P 2 5 minimum pressure, psi or MGD 5 flow rate, gpm ft3/s gpd e 5 Reynolds number, dimensionless H 5 hydraulic radius, ft i 5 pipe radius, in.
PVC, PE other smooth Plastic Pipes: 0.0015 - 0.007 (0.49 - 2.30) 10-5: . Relative roughness - ratio absolute roughness pipe duct diameter . Manning's roughness coefficients for common materials. Surface Roughness vs. Mechanical Processing
chosen adopt consistent roughness coefficient 0.012 0.013 all smooth wall pipe. either these values for versatility the tendering stage a project only hydraulic design needed, of pipe material (Concrete, PVC, HDPE).
Manning's Equation & Table . Values the Roughness Coefficient • Min = Minimum • = Normal • Max = Maximum TYPE CHANNEL DESCRIPTION MIN. NOR. MAx. CLOSED CONDUITS FLOWING PARTLY FULL METAL Brass, Smooth 0.009 0.010 0.013 . PVC (polyvinyl chloride) 0.009 0.009 — .
The Manning roughness coefficient, n, PVC 0.010. cross-sectional area, A, 4" Schedule 40 PVC 0.008103 2. hydraulic radius, h, a circular pipe the as interior radius, for 4" Schedule 40 PVC 0.0508 m. Solving the slope, S:
appropriate Manning of 0.009, sewers be installed tighter grades, reducing excavation costs disturbance. some cases, may be to downsize pipe maintaining particular flow capacity. Average Values the Manning Roughness Factor Material Manning PVC 0.009 Concrete 0.013 Cast Iron 0.015 .
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