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Nobody shows up at handover with a graduated cylinder. The turf looks right, the lines run true, and the paperwork gets signed in good weather. By the time the first rainy season ponds, the caliber dispute is already lost – the spec sheet carries one number and the puddle carries another. The only fix is to test water infiltration rate turf before the signature, with the caliber chosen in advance.
This page is the working method, written for the contractor and the field operator. It separates the two calibers, sets out double-ring and single-ring procedures, adds three no-tool screening actions, and ends at the acceptance sheet where numbers become contract language. Instruments appear as generic tools throughout – your supervisor and your lab own them. The carpet side enters only where our own production data changes what you should measure.
What a Drainage Rate Measures: Two Calibers
Anyone who sets out to test water infiltration rate turf meets two calibers wearing the same units. The spec-sheet number was produced in a laboratory on a sealed sample, while the field drains through perforated backing, infill, base and outlet as one chain. ASTM D3385 draws the same line for soils: infiltration rate and hydraulic conductivity are different quantities, not convertible without known hydraulic boundary conditions. Caliber confusion loses the dispute before the first rainy season arrives.
Caliber one is the laboratory vertical, defined by the FIFA Quality Programme Test Manual: a complete system must read above 180 mm/h in the lab. Conditioning is at 23°C, the test method follows the FIFA Test Manual 2024 edition, and every individual component must satisfy the infiltration requirement in its own right. The carpet alone is measured as product identification: a single ring on a carpet sealed before infilling, unaged, at 180 mm/h or more. A shockpad answers to the European norm 12616: at least 500 mm/h vertically under part 1 method A. Where the layer carries water sideways, horizontal flow capacity must exceed 0.1 L/s per metre.
| Caliber | Where it is produced | Device and standard | Requirement |
|---|---|---|---|
| Complete system (FIFA Quality and Quality Pro) | Lab, conditioned at 23°C | Vertical infiltration per FIFA Test Method 2024-20 | Above 180 mm/h |
| Product identification, turf carpet only | Lab, unaged carpet | Single ring on a carpet sealed before infilling | 180 mm/h or more |
| Shockpad layer | Lab | European norm 12616 part 1 method A vertical; part 2 for horizontal capacity | 500 mm/h or more; above 0.1 L/s per metre |
| School-field draft national standard | Field or lab, Annex B | Double graduated-tube ring method on the carpet surface | Above 3 mm/min, equal to about 180 mm/h |
Four rows are four calibers. When comparing quotes, ask which row a number belongs to before asking what the number is. A field reading will not match any of them exactly, which is exactly why the field needs its own procedure.
The field list has no water item. Every threshold above is a lab number, per the FIFA Quality Programme Test Manual – its field test table covers ball rebound, shock absorption and surface regularity, not infiltration. What your field does after rain is decided by a different, field-side measurement.
The Double-Ring Infiltrometer: The Standardized Field Method
For a report-grade field number, the double-ring infiltrometer is the only ASTM-standardized field method, currently edition D3385-18, last updated in April 2018, per the ASTM D3385 test method page. Stormwater manuals cite it whenever a field infiltration result must carry weight. If the job is to test water infiltration rate turf for an acceptance record, the procedure starts here.
