French (Filter) Drain Quantity Calculator
Perforated land-drain carrier laid in a granular filter trench fully wrapped in non-woven geotextile. Computes pipe (m), filter aggregate, geotextile wrap, excavation, and disposal per CESMM4 I.4.4/L.5/E.7.2, NRM2 33.1.1/5.12.1, MMHW 500.7, and SMM7 R13.
Slug · french_drain · v1.0
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French (Filter) Drain — a worked example, measured four ways
The same assembly at default dimensions, rendered as a Bill of Quantities under each measurement standard. Switch the standard to see how the bill changes. Change the inputs in the calculator to compute your own.
CESMM4 · 6 items · units m³, m, m²
| Code | Description | Unit | Quantity |
|---|---|---|---|
| E.4.4.4 | Excavation for pipe trenches, maximum depth 1-2m | m³ | 103.5 |
| E.6.2.1 | Filling, excavated material | m³ | 92.12 |
| I.4.4.2 | Perforated land drain, HDPE, nominal bore 150mm | m | 50 |
| L.5.1 | Granular bedding to pipe, Class S per HA 40/01; Type B filter (20-40mm) | m³ | 3.75 |
| L.5.2 | Granular surround to pipe, Class S per HA 40/01; Type B filter (20-40mm) (filter aggregate) | m³ | 14.68 |
| E.7.2 | Geotextile filter, 150 g/m² non-woven, including laps | m² | 130 |
Procurement take-off: the total quantity to order of each material, from the same compute. Supplier-neutral, so you buy anywhere.
- Excavation Trench103.5 m³
- Fill General92.12 m³
- Geotextile Filter130 m²
- Pipe Bedding3.75 m³
- Pipe Land Drain50 m
- Pipe Surround14.68 m³
Illustrative example at default dimensions · engine ref 7c381c · not a tendered quantity