Topographical Surveys: What You Need to Know Before Starting a Bridge or Boardwalk Project

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Before a bridge or boardwalk can be designed, it is important to understand exactly what is happening on site. Existing levels, dimensions, structures and surrounding features can all influence the final design, which is where a topographical survey can provide valuable information.

For bridge and boardwalk projects, a survey is often one of the first steps in establishing what is required and making sure the proposed structure works with the existing site.

Does every bridge or boardwalk project need a topographical survey

The need for a topographical survey will depend on the project and the information already available. For some straightforward projects, existing drawings and measurements may provide enough information. For others, particularly where there is an existing structure to replace or a more complex site to work with, a detailed survey may be required.

This can include projects such as:

● Replacing an existing footbridge
● Installing a new bridge across a watercourse or other obstacle
● Designing a boardwalk through uneven or difficult terrain
● Working with existing abutments or structures
● Connecting a new structure to existing paths or access routes
● Projects where accurate site levels are needed to inform the design

For example, when working on the replacement of the Kingerby Bridge, Polydeck initially surveyed the site to establish the necessary site measurements and abutment requirements before producing the design calculations and general arrangement drawings.

 

What does a topographical survey provide?

A topographical survey provides a detailed picture of the existing site and the information collected will depend on the requirements of the project, but can include ground levels, dimensions, existing structures, access routes and other features that may affect the proposed design.

For a bridge or boardwalk, this information can help establish how the new structure will sit within the existing environment.

Understanding changes in levels can also be particularly important. The approach on either side of a bridge, for example, needs to work with the existing terrain, while a boardwalk may need to follow changes in ground level across a longer route.

Existing abutments and connection points are another important consideration when replacing a bridge, and accurate measurements can help establish what the new structure needs to accommodate and whether any work is required before installation.

 

How is the survey information used?

A topographical survey is not an end in itself. The information gathered from the site is used to inform the design and help establish the requirements of the proposed structure.

At Polydeck, survey information can be used alongside the project’s loading requirements, site conditions and other specifications to develop the design, calculations and general arrangement drawings.

This is particularly important where the new structure needs to fit an existing location rather than being installed on a completely new site. The more accurately the existing site can be understood, the clearer the requirements are for the design and installation stages that follow.

Getting the right information from the start

Every bridge and boardwalk project has its own requirements. From a straightforward footbridge replacement to a longer boardwalk through a wetland or other challenging environment, understanding the site is an important part of developing a suitable design.

Polydeck can provide surveying as part of its wider design, manufacture, supply and installation service, helping to establish the information needed before moving into the next stage of the project.

If you are planning a new bridge, boardwalk or replacement project and need advice on the information required, get in touch with the Polydeck team to discuss your requirements.