What fall does a stormwater pipe need?

As a rule of thumb, one percent — roughly ten millimetres per metre — is the minimum for a stormwater line to keep itself clear. Flatter runs silt up, which is why the levels get set out instead of estimated.

What is the difference between an ag line and a stormwater pipe?

An ag line is slotted and wrapped in aggregate to collect groundwater from the soil around it. A stormwater pipe is sealed and carries surface and roof water to a discharge point; the two do different jobs and are often installed together.

Where is stormwater allowed to discharge?

It has to reach a lawful point — a kerb, an existing council system, or a watercourse where that is permitted — and cannot simply be pushed onto a neighbour. On acreage the discharge point often dictates the whole drainage layout.

Service

Drainage

Water Where You Want It

Drainage is the least visible work we do and the most likely to save you a repair bill. On sloping Gold Coast blocks, water arrives from uphill neighbours, from your own roof, and from every hard surface in between, and it all collects at the same low point. BD Excavation Services designs and installs drainage from surveyed levels, so pipes run on real fall rather than an eyeballed grade — ag lines behind retaining walls, spoon and swale drains across paddocks, pits and pipe runs to a legal discharge point, and trench work for detention or tank overflow.

Phone 1300 206 751 if water is going somewhere it should not. Drainage is usually built at the same time as retaining walls.

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Drainage project by BD Excavation Services on the Gold Coast

Excavated soil background behind the BD Excavation Services enquiry form

Frequently Asked Questions

What fall does a stormwater pipe need?: As a rule of thumb, one percent — roughly ten millimetres per metre — is the minimum for a stormwater line to keep itself clear. Flatter runs silt up, which is why the levels get set out instead of estimated.
What is the difference between an ag line and a stormwater pipe?: An ag line is slotted and wrapped in aggregate to collect groundwater from the soil around it. A stormwater pipe is sealed and carries surface and roof water to a discharge point; the two do different jobs and are often installed together.
Where is stormwater allowed to discharge?: It has to reach a lawful point — a kerb, an existing council system, or a watercourse where that is permitted — and cannot simply be pushed onto a neighbour. On acreage the discharge point often dictates the whole drainage layout.

Enquire about Drainage

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