Infiltration Soakaway (CIRIA C753) Quantity Calculator
Infiltration soakaway sized to CIRIA C753 with storage envelope, infiltration surface area, and perforated distribution pipe. Computes excavation, granular fill, geotextile wrap, perforated pipe (m), infiltration surface area (m²), and disposal.
Slug · soakaway · v1.0
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Infiltration Soakaway (CIRIA C753) — 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 · 11 items · units m³, m², m
| Code | Description | Unit | Quantity |
|---|---|---|---|
| E.4.2.5 | General excavation, maximum depth 2-5m, commencing from existing ground level | m³ | 258.85 |
| E.5.3 | Disposal of excavated material off-site | m³ | 165.2 |
| E.7.1 | Preparation of excavated surfaces, formation | m² | 68 |
| E.6.3.2 | Filling, imported selected granular material, Class 6N to SHW | m³ | 28 |
| E.6.2.1 | Filling, excavated material | m³ | 93.65 |
| L.5.1 | Granular bedding to pipe, 20mm single-size aggregate | m³ | 8.4 |
| L.5.2 | Granular surround to pipe, 20mm single-size aggregate | m³ | 28.8 |
| E.7.2 | Geotextile filter, 200 g/m², including laps | m² | 197.97 |
| I.8.1 | Modular geocellular attenuation crates, void ratio 30% | m³ | 100 |
| E.7.4 | Soakaway infiltration formation in silty sand; prepare base and side walls below design water level without smearing or compaction, design rate 2.50e-05 m/s; surface to receive geotextile filter and granular fill per CIRIA C753 §25.4 | m² | 110 |
| I.3.2 | Perforated HDPE distribution pipe, ID 150mm, laid within soakaway granular fill; perforations to BS EN 13476-3 or equal; geotextile-wrapped if specified | m | 10 |
Procurement take-off: the total quantity to order of each material, from the same compute. Supplier-neutral, so you buy anywhere.
- Attenuation Crate100 m³
- Disposal165.2 m³
- Excavation General258.85 m³
- Fill General93.65 m³
- Fill Selected28 m³
- Formation Prep68 m²
- Geotextile Filter197.97 m²
- Infiltration Surface110 m²
- Perforated Distribution Pipe10 m
- Pipe Bedding8.4 m³
- Pipe Surround28.8 m³
Illustrative example at default dimensions · engine ref 12a31a · not a tendered quantity