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More than just grass: the hidden engineering beneath every World Cup stadium

08/07/26

5 min read

By Jon Seymour

The 2026 FIFA World Cup has produced some unforgettable moments, from dramatic late winners to packed stadiums and spectacular atmospheres. Yet some of the tournament’s most impressive work has been taking place below ground.

When the weather stops play

When thunderstorms swept across Philadelphia during the group stage, play between France and Iraq was suspended for more than two hours whilst supporters sheltered from lightning. Once the storm had passed, the pitch was able to continue hosting the match. For most viewers, this was simply part of modern football. For some engineers, it was a reminder of just how much work takes place beneath the surface before a ball is kicked.

Football pitches have changed beyond recognition over the past few decades. The muddy, waterlogged surfaces that regularly appeared on television during the 1970s and 1980s have been replaced by highly engineered systems designed to cope with everything from prolonged drought to intense rainfall. While the grass remains the most visible part of the pitch, it’s only one component of a carefully constructed system developed through decades of research into engineering.

The science beneath the surface

Modern pitches are typically constructed using a sand-dominated root zone rather than conventional topsoil. Sand allows rainfall to move rapidly through the upper layers of the ground while still providing sufficient stability for grass roots to establish. Beneath this sits a graded gravel layer that encourages water to move evenly through the profile before reaching a network of perforated drainage pipes installed below.

Finding the perfect balance

The drainage system itself is only part of the solution. Grounds teams are constantly balancing moisture content within the root zone, as a pitch that drains too quickly can perform almost as poorly as one that drains too slowly. Too much water produces soft, unstable conditions. Too little creates a hard, dry surface that places greater stress on both the grass and the players. Modern stadiums therefore combine drainage with irrigation, moisture monitoring, and, in many cases, undersoil heating to maintain consistent growing conditions throughout the year.

The challenge is no longer simply preventing a pitch from becoming waterlogged. Tournament organisers, stadium designers and grounds teams are now dealing with intense rainfall, prolonged heat, drought stress, water availability and player welfare at the same time.

Football is not the only sport facing this problem. Wimbledon provides a useful comparison. The grass courts are maintained to precise standards, with daily cutting, controlled watering and constant attention to hardness, moisture, and wear.

The same drainage challenges faced by every development

The principles beneath a football pitch will feel familiar to anyone involved in development planning. Whether the project is a stadium, housing development, or commercial site, the questions are remarkably similar. How quickly will rainfall infiltrate? Where should surface water be directed? How much storage is required? Can runoff be released safely without increasing flood risk elsewhere? How will the system perform during increasingly intense rainfall events?

The answers are rarely straightforward, with every site behaving differently. Soil permeability, groundwater conditions, existing drainage infrastructure, local topography and nearby watercourses all influence the way water moves across and beneath the ground. Understanding those characteristics early in the design process is often the difference between a straightforward planning application and one that requires significant redesign later.

Looking beyond the pitch

The football pitch also forms only a small part of the overall picture. The roofs, concourses, hospitality areas, access roads, public spaces and car parks generate huge volumes of runoff during heavy rainfall. Collectively, these hard surfaces often present a far greater drainage challenge than the playing surface itself.

Managing that water requires a coordinated approach across the entire site. Rainfall may be directed into attenuation tanks, conveyed through below-ground drainage networks, slowed using Sustainable Drainage Systems, stored for irrigation or released gradually into surrounding watercourses under carefully controlled conditions. The objective is not simply to move water away as quickly as possible, but to manage it in a way that reduces flood risk both within the site and beyond its boundaries.

Lessons beyond the World Cup

Most developments will never attract the level of attention that World Cup stadiums do, but the engineering principles remain remarkably similar. Sustainable drainage is rarely noticed because, when it performs as intended, it quietly disappears into the background. Whether the project is a World Cup stadium or a small residential development, success is usually measured by the same outcome: people simply expect everything to keep working, whatever the weather.

The hidden engineering beneath a football pitch may seem a world away from the planning system, but it reflects the same challenge facing developers across the UK: understanding how water moves, designing for resilience and making decisions today that will continue to perform for decades to come.