Precast Concrete Outfall Headwall Quantity Calculator
Precast concrete outfall headwall from the PHW catalogue (300–1500mm), measured per CESMM4 Class H with SHW Cl. 511 and SHW Cl. 803 granular bedding. Computes precast unit (Nr), excavation, disposal, concrete or granular bedding, and optional rock armour scour apron.
Slug · headwall_precast · v1.0
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Paid assemblies surface their parameter forms, BoQ output, project save/reload, and full per-standard Excel + DXF + PDF deliverables once a CivilQuants subscription or 7-day pass is active. Per-standard bills across CESMM4, NRM2, SMM7, and MMHW; project-level recompute; watermark-free outputs.
Precast Concrete Outfall Headwall — 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 · 5 items · units m³, nr
| Code | Description | Unit | Quantity |
|---|---|---|---|
| E.4.3.4 | Excavation for foundations, maximum depth 1-2m | m³ | 18.93 |
| E.5.3 | Disposal of excavated material off-site | m³ | 18.93 |
| F.1.1.1 | In-situ concrete blinding, C8/10, thickness 150mm | m³ | 0.22 |
| H.7.1.2 | Precast concrete headwall to 600mm diameter outfall pipe, approximately 2.5t, set on bedding (catalogue size PHW_600) | nr | 1 |
| E.4.1 | Scour protection apron to precast outfall headwall, rock armour, nominal 200mm graded stone | m³ | 1.5 |
Procurement take-off: the total quantity to order of each material, from the same compute. Supplier-neutral, so you buy anywhere.
- Concrete Blinding0.22 m³
- Disposal18.93 m³
- Excavation Foundation18.93 m³
- Headwall1.5 m³
- Headwall1 nr
Illustrative example at default dimensions · engine ref 684894 · not a tendered quantity