Why Is Water Sprayed On The Diving Pool?

The sprinklers are there so divers can see the water.

It is that simple but imagine this...

Still water is invisible

A perfectly calm pool is scary to look at from up high. From up on the platform you're looking down at a flat sheet reflecting the ceiling lights while also showing right through to the bottom tiles of the pool, and there's no visual information telling you where the surface actually is.

That's a problem, because the entire back half of a dive is a distance calculation. You come out of your flip, you spot the water, and you decide in a fraction of a second when to straighten out and reach. Get that wrong by a tenth of a second and you're either short or past vertical.

Rippling the surface gives you something to actually look at. Now there's texture, movement, and depth cues, and your eyes can lock onto it.

The governing body requires it for exactly this reason. It's written into the rules as surface agitation, and every sanctioned competition pool has to have it.

There's a safety piece too

Misjudging your distance from ten meters is not a minor error. You're arriving at around 30 to 35 miles per hour and you need your hands to hit first with your arms locked. If you think you have more time than you do, you don't get to fix it.

The ripples also break the surface tension slightly, which takes a small amount of the sting out of a bad entry. Not much. But something.

Sprinklers versus bubbles: two different things

You'll sometimes see the water churning from underneath instead of being sprayed from above. Some facilities use an underwater agitator that pushes air up through the surface, and it does the same job.

But there's a second, completely separate use of bubbles that people mix up with this one.

Training pools often have a much more powerful bubble machine, sometimes called a sparger or just "the bubbles." That one isn't for visibility. It fills the landing zone with so much air that the water goes soft, and divers use it to try new dives without getting punished for landing flat.

Learning a two and a half for the first time is a lot less frightening when the worst case is a soft splat instead of a full smack. Nearly every diver who has learned a hard dive in the last twenty years learned it into bubbles first.

So: gentle ripples at a meet means visibility. A pool that looks like it's boiling at practice means someone is about to try something new.

Other things you're probably wondering

• How deep is a diving pool? Deeper than you'd guess, and for a specific reason.
• Why do divers shower after every dive? Staying warm and staying dry, and both matter more than they sound.
• How fast do divers hit the water? Around 30 to 35 miles per hour off the ten meter platform.
• What is a smack? Exactly what it sounds like, and every diver has a story.

- DG