Cast iron
- Absolute ε lower
- 0.25908 mm
- Absolute ε upper
- 0.25908 mm
- Selected ε scenario
- 0.25908 mm
More dimensions
- ε/D lower
- 0.005
- ε/D upper
- 0.005
VALICALC · TECHNICAL REFERENCE
Pipe Roughness Chart
Look up scoped new-pipe Darcy roughness examples, compare relative roughness at your bore and transfer an explicitly selected value to Pump TDH.
SELECT YOUR CONDITIONS
Search within the verified subset. Numeric sizes match complete designations; a nearby size is a candidate, not an exact match.
SELECTED REFERENCE
Steel
- Absolute ε lower
- 0.04572 mm
- Absolute ε upper
- 0.04572 mm
- Selected ε scenario
- 0.04572 mm
All fields & cell provenance
- ε/D lower
- 9.144e-4
- ε/D upper
- 9.144e-4
- New pipe material: EPANET hydraulic input coefficients — Table 3.2, new pipe; ε units ft×10^-3 converted to mm · verified 2026-10-06 · source value Steel.
- Absolute ε lower: EPANET hydraulic input coefficients — Table 3.2, new pipe; ε units ft×10^-3 converted to mm · verified 2026-10-06 · source value 0.04572.
- Absolute ε upper: EPANET hydraulic input coefficients — Table 3.2, new pipe; ε units ft×10^-3 converted to mm · verified 2026-10-06 · source value 0.04572.
- Selected ε scenario: EPANET hydraulic input coefficients — Table 3.2, new pipe; ε units ft×10^-3 converted to mm · verified 2026-10-06.
- ε/D lower: EPANET hydraulic input coefficients — Table 3.2, new pipe; ε units ft×10^-3 converted to mm · verified 2026-10-06.
- ε/D upper: EPANET hydraulic input coefficients — Table 3.2, new pipe; ε units ft×10^-3 converted to mm · verified 2026-10-06.
v1.2.0 · verified 2026-10-06 · values use the valid conditions shown above
Use this value
Review the selected values and units in the calculator before applying them.
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Pump TDH Calculator →Steel0.04572 mmBack to answer ↑
Explore the verified data
5 matching rows · 5 in this subset
| New pipe material | Absolute ε lower | Absolute ε upper | Selected ε scenario | Actions |
|---|---|---|---|---|
| Cast iron | 0.25908 mm | 0.25908 mm | 0.25908 mm | |
| Concrete / lined concrete | 0.3048 mm | 3.048 mm | 0.3048 mm | |
| Galvanized iron | 0.1524 mm | 0.1524 mm | 0.1524 mm | |
| Plastic | 0.001524 mm | 0.001524 mm | 0.001524 mm | |
| Steel | 0.04572 mm | 0.04572 mm | 0.04572 mm |
Concrete / lined concrete
- Absolute ε lower
- 0.3048 mm
- Absolute ε upper
- 3.048 mm
- Selected ε scenario
- 0.3048 mm
More dimensions
- ε/D lower
- 0.006
- ε/D upper
- 0.061
Galvanized iron
- Absolute ε lower
- 0.1524 mm
- Absolute ε upper
- 0.1524 mm
- Selected ε scenario
- 0.1524 mm
More dimensions
- ε/D lower
- 0.003
- ε/D upper
- 0.003
Plastic
- Absolute ε lower
- 0.001524 mm
- Absolute ε upper
- 0.001524 mm
- Selected ε scenario
- 0.001524 mm
More dimensions
- ε/D lower
- 3.048e-5
- ε/D upper
- 3.048e-5
Steel
- Absolute ε lower
- 0.04572 mm
- Absolute ε upper
- 0.04572 mm
- Selected ε scenario
- 0.04572 mm
More dimensions
- ε/D lower
- 9.144e-4
- ε/D upper
- 9.144e-4
How to use this data
ε in source millifeet ×0.3048 gives mm. Relative roughness is ε/D with matching units. Select a position in the disclosed interval for a planning scenario; verify actual conditions.
CHECK THE METHOD
Worked example
EPA new steel ε=0.15 millifeet = 0.04572 mm. At D=50 mm, ε/D=0.0009144.
Related calculators
Continue the reference workflow
Common lookup questions
Can I use these values as a universal specification?
Roughness depends on surface, age and lining. The range-position scenario is your choice, not a measured installed value. Hazen-Williams C is a different parameter.
TRACEABLE DATA
Sources, scope & verification
Dataset v1.2.0
Last verified:
Five new-pipe material examples from EPA EPANET Table 3.2. Not an aged/corroded pipe database.
Values are curated product facts or generated scenarios. Paid standards, complete catalogs and source diagrams are not reproduced. A verification date applies to this documented subset.
EPANET hydraulic input coefficients ↗
Type B · US EPA · EPANET 2.2; EPA/600/R-20/133, 2020
Selected government-authored engineering facts; source conditions are retained.
Full provenance & artifact record
- Source checked
- 2026-10-06
- Use basis
- public-domain
- Artifact SHA-256
- No retained source artifact hash; see the stated source and verification record.