8.6.4-1
Drainage runs below ground
Component Information
- Code:
- 8.6.4-1
- Sequence:
- 1
- Unit:
- m
- Sub-Element:
- 8.6.4 - 4 Land drainage
Drainage runs below ground
details, including depth of trench (m) and nominal size of pipe (mm), to be stated.
Component Statistics
Measurement Rules
Included Items
Excluded Items
Measurement Rules (9)
Where components are to be enumerated, the number of components is to be stated.
The length of linear components measured is their extreme length, over all branches, fittings, etc.
The area measured for drainage blankets is the surface area of land serviced by the blanket.
The area measured for land drainage for parklands is the surface area of parkland.
Other cost-significant components are to be described and identified separately. Such components are to be measured by area (m2) or linear measurement (m), or enumerated (nr) separately in accordance with the rules of measurement for this sub-element.
Descriptions should include the amount of any PC sum included in the unit rates applied to the item.
Work outside the curtilage of the site is to be described and identified separately.
Where the contractor is only responsible for designing specific elements and/or components of the building project (i.e. not the entire building project), contractor-designed work is to be described and identified separately.
The percentage additions for testing and commissioning are to be applied to the total cost of the items comprising the sub-element. A single combined percentage addition can be applied to cover the costs of both testing and commissioning
Included Items (19)
Filter drains, with or without pipes.
Fin drains, with or without pipes.
Mole drains.
Trenchless drains.
Pipe drains, including fittings.
Drainage blankets (e.g. comprising layer of aggregate, porous pipes and upper/lower geotextile pipes).
Trenches for pipework,including excavation, earthwork support, backfilling and disposal of surplus material.
Pipework and pipework fittings (to point of disposal).
Granular fill and surrounds.
Geotextile filters and trench linings.
Silt traps, silt trap, manholes, etc.
Soakaways.
Storage tanks and vessels.
Outfalls/outlet headwalls.
Builder’s work in connection with land drainage.
Clearing existing ditches, channels, etc.
Sundry items.
Testing and commissioning.
Where works are to be carried out by a subcontractor, the subcontractor’s preliminaries, design fees, risk allowance, overheads and profit, with allowance for these to be made within unit rate applied to element or component.
Excluded Items (2)
Groundwater pressure relief drains for basement retaining walls connected from the main underground drainage systems to the point of disposal (included in element 1.1).
Testing and commissioning of land drainage (included in sub-element 8.6.4).
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