Why is the Olympic hockey field so wet?

The slow-motion replays during Olympic hockey games give viewers new to the sport a good chance to notice something odd about the field: It's always soaking wet, even when the weather is better.

This is normal in high-level field hockey, and has been since the 70s. There are several reasons why watered grass is better than dry grass (which is often filled with sand). One is for safety: gliding over wet grass is smoother, and that lack of friction helps reduce grass burn. According to the grass manufacturer TigerTurfWatered turf also absorbs impact better, making it better for your body (especially if you fall).

The lack of friction is also good for the ball. As NBC Sports explainsIt makes for sharper passes and less awkward bounces of the ball. In other words, without having to fight the resistance between the ball and the grass or having your pass interrupted by the ball bouncing wildly off the court or way too high, the whole game becomes more fluid. The International Hockey Federation summarizes it similar: Irrigation creates a fast, predictable and consistent playing surface, allowing players to perform at their best.

But watered grass has a serious downside: it uses a ton of water. According to grass supplier Green fieldsTo irrigate a hockey field for one game, an average of 6,000 liters (about 1,585 gallons) of water is needed. This is enough drinking water for a household of 3 for 6.5 years.

The sport has shown a commitment to reducing water usage. In 2018, the International Hockey Federation launched a Dry Grass Initiative to encourage manufacturers to develop better dry grass that can replace wet grass. Organizations have also developed new types of wet grass that are made from more sustainable materials that require less water. For example, at the 2021 Summer Olympics in Tokyo, the Poligras hockey field consisting of 60 percent sugarcane and used 39 percent less water than its predecessor at the 2016 Games in Rio de Janeiro.

Poligras stepped up a gear for Paris 2024 with a carbon-neutral pitch made from 80 percent sugar cane. According to its websiteLight rain or dew on a cool night can sometimes be enough to transform the grass field to an Olympic level of performance. (But Olympic officials have done something manual watering in Paris.)

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