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Course closed? This is how much damage the rain is doing

It’s raining, it’s pouring – and our golf courses are suffering. Two experienced greenkeepers outline the challenges they and their colleagues are facing over the coming months.

by Steve Carroll | October 16, 2019 | Club & Amateur

It’s only mid-October but the ‘course closed’ signs are already out in force across the country. The real concern is this is only the beginning of a bleak and long winter. So how does rain affect golf courses? We spoke to Lee Strutt, master greenkeeper and course manager at the Royal Automobile Club, and Sam Bethell, course manager at Chipstead, both in Surrey, to get an expert view…

How does rain affect golf? Walking on wet grass really damages it

We think grass grows in soil. It doesn’t. The roots actually grow in air spaces between soil particles.

“Imagine the soil is like a sponge,” says Strutt. “There are some pockets we want with air and some we want with water.

“Because of that honeycomb effect, water can freely drain through the soil profile. If we start walking on these soils when they are saturated then a lot of those little pockets get closed up and water can’t move through as easily and it takes a lot longer to dry out.”

“When you’ve got water going through the profile, gravity will take it down but it gets to a point where it can go no further,” adds Bethell.

“When you get more on top, you’re reaching saturation point. If the roots haven’t got any air, there’s only so much time they can sit in water before they get weak and start to die off. That’s why you’ll see waterlogged grass start to go brown. The roots can’t take it.

“If you walk on it, and it’s wet from the top down, you just compact it and push the grass into the soil. You are crushing the area where the roots are. All those pore spaces for air and water are being compacted and squashed. That’s why the water comes up around your feet.”

How does rain affect golf? That damage may last months

It will stop heaving, eventually. But, if a course has had heavy play, the damage won’t be repaired any time soon.

“It’s very similar to frost,” explains Bethell, whose course had seen close to four inches of rain in October before the skies opened again this week.

“You could walk out on a golf course and see there’s no frost. It could be frozen, though, but you can’t see it.

“Rain is the same. It will start drying out from the top but it doesn’t mean that a couple of inches under it isn’t still soaking wet.

“It has got to work down and gravity has to do its thing.”

Strutt adds: “We might start seeing some deterioration in the playing surface, and the time we really want the plant to perform well – the following summer – all the damage within the soil might take several months to recover and require remedial action and additional works to put right.

“We’re six months away from where we hit warm growing weather again. Any damage or issues we have now, we are not going to really have recovery until next April or May.”

How does rain affect golf? It’s a vicious circle

No sooner do we get over one big downpour, another follows right behind.

So here’s what happens to our courses if October continues into a wet winter.

“It’s a greenkeeper’s worst nightmare,” admits Strutt. “Wet warm winters and increased disease activity equals more cost, greater deterioration of surfaces through continued wet periods and, effectively, gains made in the summer would be lost for the following season.”

Says Bethell: “We can’t stop nature. We can’t change the weather and we can’t stop it raining.

“But we can stop people and we can stop buggies and trolleys. That is something we can control. That’s why you’ll get a lot of roped off areas. It’s horrible to look at but, without that, it would be absolute carnage.” [i]

How much rainfall have we had at Drax?

Between the months of October and December, the course at Drax saw an unprecedented amount of rainfall.

Each day, our greens team record the amount of rainfall over the previous 24 hours. In quarter 3 (October, November & December), the course was submerged in 309mm (12.17 inches) of water.

What does 1mm of rainfall mean?

1mm rainfall means every one square meter area is filled with the water of height 1mm.

1 square meter = 1000mm length ×1000mm breath

So 1mm rain means 1000mm length × 1000mm breath × 1mm height = 1litre of water.

Every square meter has one litre of water

In laymen terms:

Take a vessel of 1 square meter in dimention and keep it in an open space during rain, you will be having 1mm height of water in it that is 1 litre of water in it at the end of the rain.

Let's put that into perspective, 309 mm = 309 litres per square meter. An average 1700 x 700mm bath holds approximately 180 litres up to overflow level!



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