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Stormwater Attenuation Tank Quantity Calculator
Underground stormwater attenuation tank with inlet, outlet, and overflow. Computes excavation, granular surround, tank build (concrete or geocellular), and disposal.
Slug · attenuation_tank · v1.0
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Stormwater Attenuation Tank — 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 · 9 items · units m³, m²
| Code | Description | Unit | Quantity |
|---|---|---|---|
| E.4.2.5 | General excavation, maximum depth 2-5m, commencing from existing ground level | m³ | 709.8 |
| E.5.3 | Disposal of excavated material off-site | m³ | 485.1 |
| E.7.1 | Preparation of excavated surfaces, formation | m² | 234 |
| E.6.3.2 | Filling, imported selected granular material, Class 6N to SHW | m³ | 158.4 |
| E.6.2.1 | Filling, excavated material | m³ | 224.7 |
| L.5.1 | Granular bedding to pipe, 20mm single-size aggregate | m³ | 29.7 |
| L.5.2 | Granular surround to pipe, 20mm single-size aggregate | m³ | 81 |
| E.7.2 | Geotextile filter, 200 g/m², including laps | m² | 545.69 |
| I.8.1 | Modular geocellular attenuation crates, void ratio 95% | m³ | 216 |
Procurement take-off: the total quantity to order of each material, from the same compute. Supplier-neutral, so you buy anywhere.
- Attenuation Crate216 m³
- Disposal485.1 m³
- Excavation General709.8 m³
- Fill General224.7 m³
- Fill Selected158.4 m³
- Formation Prep234 m²
- Geotextile Filter545.69 m²
- Pipe Bedding29.7 m³
- Pipe Surround81 m³
Illustrative example at default dimensions · engine ref e306df · not a tendered quantity