Topographical & Utility Survey for 64MW Solar Farm

The Brief

Ameresco, a leading clean technology integrator, got in touch ahead of a major renewable energy project: a 64-megawatt solar farm spread across 200 acres of open farmland. Before any construction could begin, they needed a clear, reliable survey of the entire site, both above and below ground.

The site presented several challenges. Ditches, streams, hedgerows and large mature trees crossed the land in multiple directions. The terrain sloped and changed elevation across the 200-acre footprint, and there was a general lack of reliable information on what might be buried beneath the surface. The last thing anyone wants on a project of this scale is to hit an unknown service during construction.

Ameresco needed two things: a detailed topographical survey to understand the terrain and inform panel layout design, and a full underground utility survey to identify any buried services before groundwork began.

The Scale of the Challenge

200 acres is a significant area to survey. To put it in context, that's roughly the size of 150 football pitches. Every metre of that land needed to be mapped with enough detail for the design team to make confident decisions about panel placement, access routes, cable trenching and drainage.

The topographical survey alone required capturing thousands of data points across the site. Surface features like trees, hedgerows, ditches, banks, fences and existing structures all needed plotting. And a 10-metre spot level grid across the entire footprint would give the engineers the elevation data they needed to understand drainage patterns and optimise panel angles.

On top of that, the underground utility survey had to cover the full site perimeter and all planned cable routes. On agricultural land, utility records are often incomplete or non-existent. Buried field drains, old water supplies, telecoms cables serving nearby properties and none of this is reliably documented. The only way to know for sure is to survey it.

Topographical Survey

We mapped the site in detail using a combination of GPS receivers and robotic total stations. Every surface feature was captured: trees, hedgerows, ditches, streams, banks, fence lines, gates, tracks, overhead cables and existing structures. The complete dataset gave the design team a true picture of what they were working with.

A 10-metre spot level grid was laid out across the full 200 acres. This captured how the land sloped and changed elevation across the site, which was essential for two reasons. First, it informed the panel layout. Solar panels need to be angled correctly relative to the ground to maximise energy generation. Second, it identified natural drainage patterns that would need to be maintained or managed during and after construction.

All survey data was referenced to Ordnance Survey national grid coordinates and levels, making it directly compatible with the engineering design software used by Ameresco's team.

Underground Utility Survey

Next, we traced any buried services across the site using a combination of Ground Penetrating Radar (GPR) and electromagnetic locating equipment. On agricultural land, this is particularly important because utility records are often incomplete, outdated or simply don't exist.

The survey turned up several underground utilities that hadn't been logged or documented anywhere. These were services that could have caused serious delays, costly damage or safety incidents if they'd been struck during cable trenching or foundation installation. Better to find them now than discover them the hard way with an excavator.

Every detected utility was plotted in the CAD dataset with depth estimates, so the design team could route cables and access roads around known services. Where detection results were ambiguous, we flagged areas for potential trial hole verification before construction.