E-RETE has the facilities for the manufacture and load testing of the following types of DWF box culverts :

1. Standard Precast R.C. Box Culverts, widths in the range of 600 mm to 1800 mm:
   • Box Culvert that comprises of a U-shape section incorporated with a dry weather flow section and a separate lib slab; and
2. Large Precast R.C. Box Culverts, widths in the range of 2100mm to 4800mm :
   • Box Culvert that comprises of a U-shape section incorporated with a dry weather flow section and a separate lib slab.
3. Standard Precast R.C. Open Drains, width in the range of 600mm to 1800mm
   • Open Drain that comprises of a U-Shape section incorporated with a dry weather flow section
4. Large Precast R.C. Open Drains, widths in the range of 2100mm to 4800mm
   • Open Drain that comprises of a U-Shape Section incorporated with a dry weather flow section

E-RETE can design & manufacture other size according to customer requirement upon request.

Standard and large E-RETE Box Culverts incorporated with a dry-weather flow section would be very ideal for culvert works in areas where the normal flow is relatively small.

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Application

E-RETE Box Culverts are designed as a precast unit for culvert works and may be used in the construction of

1. Open Drains
2. Ducts
3. Tunnels, sumps, etc.

E-RETE Box Culverts are designed to take a more severe loading than the standard culvert pipe. They are able to withstand direct traffic loading and so may be placed at pavement level or immediately under the road surfacing. As such E-RETE would recommend the use of Box Culverts in areas where the depth of fill over the crown is less than 600 mm in place of culvert pipes as the latter may have to be encased in concrete in order to obtain the required strength. Concrete encasement is a very expensive installation and it is usually not recommended.