AS/NZS 2566.1:1998 (Amd 1:2017) · Structural Design of Buried Flexible Pipelines
Design buried
flexible pipe
to the standard.
The independent guide and free design tools for Australian and New Zealand engineers working to AS/NZS 2566.1. Covers deflection, buckling, ring bending strain — with worked examples, an interactive calculator, and free checkers for gravity sewers and sewage pump stations.
Articles & Guides
AS2566.1 Structural Design, Explained
Plain-English articles on the standard — soil parameters, design checks, and the common mistakes engineers make with E'.
E' soil modulus — embedment vs native soil
Deflection — a step-by-step worked example
AS2566.2 Table 5.6 — GRP allowable deflection
Part 1 vs Part 2 — which applies to your task
Design Calculator
AS2566 Deflection & Buckling Calculator
Enter pipe, soil, and load parameters. Get AS2566.1-compliant results with full step-by-step workings. Free, no login.
Deflection check (Δy/D)
Ring bending strain · Shape factor Df
Buckling (Eqs 5.4(4) and 5.4(5))
Pipe database · Save/load · PDF export
Design Checker
Gravity Sewer Design Checker
Check a sewer reach against Australian authority criteria — grade window, self-cleansing shear, depth, velocity and capacity. Free, no login.
YVW · Water Corp DS50 · Icon Water · SA Water
Grade window with governing criteria
Tractive force τ = ρgRS · d/D · Froude
Camp hydraulic-elements diagram, live
New · Design Checker
Pump Station & Rising Main Checker
System curve vs pump curves for a sewage pump station — duty points, wet well sizing, NPSH and power. Free, no login.
10 AU & NZ authority presets, clause-cited
Duty points for 1–6 pumps · VSD affinity
Chainage profile with HGL & air-valve flags
Synthesise a curve from any BEP · Wet well & starts
Standards
AS/NZS 2566.1:1998
Amd 1:2017
AS/NZS 2566.2:2002
AWWA M45 ref.
Articles
Technical guides for AS2566 structural design, gravity sewer hydraulics and pump stations
The E' Soil Modulus Problem in AS2566: What the Standard Gets Wrong
AS/NZS 2566.1 incorrectly equates embedment modulus and native soil modulus. For most projects, this changes your deflection result by 20–40%. Here's what the standard gets wrong and how to apply it correctly.
Read article →
2026
Covered in this article
E'e vs E'n — why they're not the same
Leonhardt correction factor ζ
Howard (1977) vs AS2566 Table 3.2
Look & Cameron (2018) — the current consensus
Which value to use on your next project
AS2566 Deflection: A Step-by-Step Worked Example
A full DN315 PE100 gravity sewer worked to AS2566.1 — loads, effective soil modulus, the modified Iowa formula, and the deflection acceptance check.
Read article →2026
AS2566.2 Table 5.6: GRP Allowable Deflection
What the AS2566.2 Table 5.6 allowable deflection limit for GRP means, where it applies, and how it differs from the Part 1 design deflection check.
Read article →2026
AS2566.1 vs AS2566.2: What's the Difference?
Part 1 is structural design; Part 2 is installation. Which part of AS/NZS 2566 applies to your task, and how the two parts work together on a project.
Read article →2026
For Manufacturers & Suppliers
List your product data. Reach the engineers specifying pipe.
We maintain the most complete independent AS2566.1 resource in Australia. If you manufacture buried flexible pipe — HDPE, PVC, GRP, or steel — we'll publish your technical data alongside our design guides, attributed and linked to your product resources.
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Your stiffness class data pre-loaded as a selectable option in the calculator
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Free — this is an independent engineering resource, not a paid directory
Manufacturer directory
Manufacturers whose submitted technical data has been reviewed and published on this site.
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