Description

VicRoads Concrete Double Batter Outlet (SD 1641)

This dual-pipe headwall serves subsoil drainage and complies with VicRoads / DTP SD 1641 (Type 2). It controls discharge and limits erosion at the outlet, protecting embankments and the pavement structure.

In simple terms: a precast concrete outlet for two drain pipes that lets water discharge safely on a batter and helps stop erosion.

Key features & benefits

SD 1641 compliant: Matches VicRoads / DTP detailing for Type 2 headwalls.
Dual discharge: Two outlets manage higher flows and reduce local scour.
Robust build: High-strength precast concrete for long service life and low upkeep.
System ready: Coordinates with SD 1611 subsurface pits and SD 1631 terminals.
Project friendly: Suits road shoulders, embankments and cut-to-fill zones.

Applications

Subsoil drainage with higher discharge or redundancy needs.
Road and infrastructure projects built to VicRoads / DTP standards.
Embankment outlets where erosion control and stability matter.

Specifications

Standard	VicRoads / DTP SD 1641 — Pavement Drain: Alternative Arrangements (Type 2)
Material	High-strength precast concrete
Approx. unit weight	740kg
Overall dimensions	900mm × 870mm × 400mm
Associated drawings	SD 1611 (Subsurface Drain — Pits); SD 1631 (Pavement Drain — Terminals)
Variants	Single batter headwall (Type 1)

Note: Confirm invert levels, pipe connections, bedding and erosion control to the engineer’s design and VicRoads requirements.

Installation

Set the headwall per SD 1641 (Type 2) and align with drain grades.
Connect both outlet pipes and seal per project specification.
Backfill and compact to maintain grade and protect against scour.

Download SD 1641 (PDF) | Request a quote

Dimensions

Product Code	Product Description	Dimensions	Weight	SD REF
VRBATOUTDOUB870	Batter Outlet Double	900mm x 870mm x 400mm	740kg	SD 1641

FAQ

Is this VicRoads approved?

Use: complies with VicRoads / DTP SD 1641. The authority publishes the standard detail; products are supplied to comply with it.

What’s the difference between SD 1641 Type 1 and Type 2?

Type 1 is a single-pipe batter outlet (single batter). Type 2 is a two-pipe batter outlet (double batter).

Which drawings does this interface with?

Typically SD 1611 (subsurface drain pits) and SD 1631 (pavement drain terminals). Follow the project design.

Can I use this on non-VicRoads projects?

Often yes—many councils accept DTP details. Always check the project specification or obtain written approval.

What pipe size connects at the outlet?

SD 1641 commonly notes 150mm diameter FRC outlet pipes from pits. Confirm upstream design before finalising.

Can I connect PVC/HDPE subsoil lines?

Yes—use designer-nominated transitions/adaptors to the required outlet pipe material/class.

Do you supply penetrations pre-formed?

Supply blank for site coring or pre-cored to order. Nominate pipe sizes, centres and invert levels at order.

What’s the typical size and weight for the double outlet?

Indicative ~900mm x 870mm x 400mm and ~740kg. Confirm exacts at quotation/order.

Do I need a flush-out riser?

Often recommended. SD 1641 shows single/double flush-out risers for maintenance access.

How is erosion at the discharge controlled?

By the designer’s detail—e.g. rock beaching, Reno mattress, apron slab, or vegetated swales.

How is offloading handled?

Delivery by truck to be forklift unloaded. Crane available on request. Ensure safe access, level ground and clear lifting zones at site.

Do you provide datasheets/drawings and warranty?

Yes—spec sheets and SD references provided; customs may include shop drawings. Standard warranty against manufacturing defects applies.

VicRoads Concrete Double Batter Outlet

Description