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Precast Concrete Box Culverts Used for Stormwater Detention in Maple Ridge, B.C.

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In 2019, Core Group Civil Consultants was awarde the design of the stormwater management system for the Bridle Ridge development site in Maple Ridge, B.C.

Maple Ridge is a large suburb area located adjacent to the Fraser River east of Vancouver, B.C. This area receives significant rainfall events which result in substantial stormwater runoff in this urban area. Recent rapid urban density growth for this area requires design engineers to include stormwater runoff calculations as part of their development plan. Preventing uncontrolled stormwater runoff into the Fraser River is a key requirement of the plan.

RELATED: Box Culvert Installation

After careful analysis, it was determined that the development site would require two stormwater detention systems to address the potential runoff.

Given the site requirements with respect to the amount of cut and fill, live and dead loading requirements and the very tight timelines, precast box culverts were the product of choice for this application.

Other key requirements of this system were:

  1. Provide a watertight seal to prevent exfiltration
  2. Store and control discharge water
  3. Meet required industry design standards
  4. Cost effective, timely and safe solution

Langley Concrete Group was the chosen precast producer for this project.
The Langley Concrete Group recommended using ASTM C1433M precast
boxes that are designs for BCL625/HS20 live loading while being able to
accommodate a burial depth of 1.7m to 3.8m.

The ASTM C1433M standard contains predesign sizes for box culverts
from 900mm span by 600mm rise up to 3600mm span by 3600mm rise.
Since these boxes are standard sizes they can be readily manufactured by
Langley Concrete Group.

In order to provide the required watertight seal, the precast box structures were shipped with prelubricated gaskets that meet the current ASTM standards.

The two systems were comprised of the following structures:
System 1 was comprised of 2430mm x 2430mm box sections with a total
run length of 75 linear meters.
System 2 was comprised of 3650mm x 3430mm with two adjacent runs,
side by side. The first run length was 16.05 linear meters and the second
was 13 linear meters.

Based off our designs, the Langley Concrete Group provided structural
engineering shop drawings for our review prior to casting.

Given the challenging soil conditions encountered on the project site along
with the significant amount of earthwork, a rapid installation of these
structures was critical.

Langley Concrete Group coordinated the deliveries to ensure the precast
concrete box structures arrived on site and on time. There was excellent
coordination between the Langley Concrete Group and the general
contractor, B&B Contracting Group. System 1 was installed in 7.5 days
which included base preparation, crane pad preparation, box culvert
installation and backfilling. System 2 had a four day install.

Langley Concrete Group provided the precast concrete design, manufacturing and logistical expertise to help ensure the successful completion of the Maple Ridge stormwater detention project.

Cormac Nolan, P.Eng. Civil Engineer, Core Group Civil Consultants ltd. Burnaby, British Columbia


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