supplier evidence checklist

Geocellular Supplier Evidence Checklist

Run this 8-point check against any crate supplier — including Storm Manage — before you specify a geocellular stormwater tank. Tick each item the supplier can actually evidence. Your live score maps to a verdict on whether a specifier could complete a CIRIA C737:2016 assessment from what they gave you.

Run the checklist

1A short-term compression report to BS EN 17150:2019, with a report number.

Why it matters: establishes the crate’s short-term vertical strength — the starting point every design factor is later applied to. A traceable report number lets you check it.

BS EN 17150:2019

2A long-term / creep compression programme to BS EN 17151:2019, giving a 50-year characteristic strength.

Why it matters: plastic crates creep under sustained load, so only a creep programme yields a strength you can trust for a 50-year design life. A short-term number cannot substitute for it.

BS EN 17151:2019

3A stated partial material factor (γ_m) and the resulting design strength per CIRIA C737:2016.

Why it matters: an ultimate strength is not a design strength. Without γ_m and the derived design value you cannot legitimately check your load case.

CIRIA C737:2016

4Product conformity to BS EN 17152-1:2019 (storm water boxes, PP / PVC-U).

Why it matters: confirms the unit is a specified, conforming stormwater box against the product standard — not a generic plastic component sold as one.

BS EN 17152-1:2019

5The test laboratory named, and whether the test was third-party accredited (e.g. ISO/IEC 17025) or witnessed at the supplier’s own lab.

Why it matters: a third-party accredited result carries more weight than a test merely witnessed at the supplier’s own laboratory. You need to know which one you have.

ISO/IEC 17025

6A declared cover-depth range — minimum AND maximum — for the traffic class you are specifying.

Why it matters: both shallow and deep cover can govern the design. A single number hides which case controls your installation.

CIRIA C737:2016

7Whether construction-stage (temporary works) loading was included in the design check.

Why it matters: construction plant is often the worst load case — heavier than the finished-condition traffic the tank is later designed around.

EN 1991-2 / CIRIA C737:2016

8Independent product assessment (BBA / Kiwa / WRc) — recommended, but not a legal precondition.

Why it matters: useful assurance, yet not legally required. The binding gate is the per-project CIRIA C737 classification score agreed with the water company and the Lead Local Flood Authority.

BBA / Kiwa / WRc (advisory)

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Geocellular Supplier Evidence Checklist — 8 items

1. A short-term compression report to BS EN 17150:2019, with a report number.
2. A long-term / creep compression programme to BS EN 17151:2019, giving a 50-year characteristic strength.
3. A stated partial material factor (gamma_m) and the resulting design strength per CIRIA C737:2016.
4. Product conformity to BS EN 17152-1:2019 (storm water boxes, PP / PVC-U).
5. The test laboratory named, and whether the test was third-party accredited (e.g. ISO/IEC 17025) or witnessed at the supplier’s own lab.
6. A declared cover-depth range — minimum AND maximum — for the traffic class you are specifying.
7. Whether construction-stage (temporary works) loading was included in the design check.
8. Independent product assessment (BBA / Kiwa / WRc) — recommended, but not a legal precondition; the real gate is the per-project CIRIA C737 classification score agreed with the water company and Lead Local Flood Authority.

Your score

0/ 8

Ask for more evidence before you specify

Final grade and volume must be confirmed by a per-project structural calculation to CIRIA C737:2016, carried out by a competent engineer. This checklist scores evidence completeness only — it is not itself a design sign-off.

How Storm Manage scores

Static reference — 5 / 8 answered (not counted in your live score above)

An honest self-assessment against the same 8 items. Five are answered; three are not yet answered.

#	Status	What Storm Manage can show
1	Answered	Intertek third-party report 190702149GZU-001 (ISO/IEC 17025 process): short-term vertical, 600 kN/m² recorded without specimen failure — a short-term lower bound, not a design value. Method stated as CIRIA C680:2008, since superseded by C737:2016.
2	Not yet	No independently derived 50-year characteristic strength. A 60-ton creep test record exists and is released on request.
3	Not yet	No independently derived 50-year design strength, so no published γ_m or C737 design value is claimed.
4	Answered	Supplied as a specified stormwater box. CE conformity to EN 1852-1:2018+A1:2022 (UDEM notified body, cert M.2024.206.C96869) covers the polypropylene material — this is material conformity, not a structural rating of the tank.
5	Answered	Both labs named and their status disclosed: Intertek (third-party, ISO/IEC 17025 process); SGS report XMIN2401000036PL04 witnessed at our own laboratory to a client-specified method (supplier evidence, not third-party accreditation).
6	Answered	Cover-depth ladder published — from ~250 mm for landscape / non-trafficked, through 0.8–1.5 m for car parks, to project-specific for airport / port hardstanding (min AND max both checked at that class).
7	Answered	Construction-stage (temporary works) load case requested with every enquiry, since construction plant is often the worst load case.
8	Not yet	No BBA certificate held — and none is a legal precondition. The real gate remains the per-project CIRIA C737 classification score plus BS EN 17152-1 conformity, agreed with the water company and Lead Local Flood Authority.

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