The Ultimate Wave Pool Quiz

By: HowStuffWorks.com Contributors

The Ultimate Wave Pool Quiz
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About This Quiz

Modern civilization loves to re-create nature. We have artificial light, artificial Christmas trees, artificial grass, artificial hearts and even artificial beaches! Curious as to how an artificial beach actually works? Take our quiz and get a behind-the-scenes glimpse at the workings of the giant wave pool "Thunder Bay" in Greensboro, North Carolina.
In the ocean, how are waves created?
through the magnetic pull below the earth's surface
through wind
In the ocean, waves are created when the wind pushes on the water, disturbing the molecules and creating a domino effect of disturbed water along the ocean's surface.
through water pressure

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What do you need to recreate a simple wave in a pool of water?
You need some means of creating a periodic disturbance.
You need some means of creating a periodic disturbance, like a blast of air, a rotating paddle or an oscillating plunger.
You need a water pump or a hydraulic piston.
You need at least five gallons ( 19 liters) of water.

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What is the name of the kid's wave pool at Emerald Pointe's water park?
Kiddies' Bay
The Ultimate Kid's Wave Pool
Splash Island
The kid's wave pool, Splash Island, is created using the simple wave model.

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What does Splash Island use to generate a disturbance in the water?
a high speed fan
Splash Island uses a high speed fan to blow periodic blasts of air into a wide metal pipe, through an exhaust port and out onto the water.
an oscillating plunger
a rotating paddle

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What kind of valve is used inside the wide metal pipe at Splash Island?
a diaphragm valve
an hydraulic valve
a butterfly valve
A butterfly valve, a wide disc attached to a revolving metal axis rod, is used. It enables the air from the fan to blast periodically: when the disc is horizontal, it blocks the air; when it revolves to a vertical position, it allows the air to pass through.

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What makes the butterfly valve rotate?
an hydraulic piston
An hydraulic piston moves a rod, to which the butterfly valve is attached, at regular intervals.
a pump
an electric timer

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Why can't Splash Island's wave generating system be used to create enormous, surfable waves?
Its system works only for pools of water that contain less than 1, 000 gallons (3, 785 liters ); you need more water than that in a large wave pool.
It can, it is just not cost effective.
It would require too large a force.
To create enormous, surfable waves, you would need too large a force, like a giant fan or an extra strength plunger, to create a strong enough disturbance. A large wave pool relies on the surge created by dumping huge amounts of water into the deep end of a pool.

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How many basic parts are there to a large wave pool?
three
five
There are five main parts to a large wave pool: a water pumping system, a water collection reservoir, a number of release valves at the bottom of the reservoir, a slanted swimming pool and a return canal.
10

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What can the functioning of the giant wave pool, Thunder Bay, be compared to?
a toilet
The giant wave pool functions in a similar way to a toilet: when the water level is high enough, release valves are opened, dumping water into the pool or into the toilet.
a bath
the ocean

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How is Thunder Bay kept sanitary?
It uses extra strength chlorine.
The water is changed daily.
The water is continually filtered.
Thunder Bay has six powerful filters that work 24 hours a day to purify the water from dirt particles.

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How much water does Thunder Bay hold?
500,000 gallons (1.9 million liters)
1,000,000 gallons (3.8 million liters)
2,000,000 gallons (7.6 million liters)
Thunder Bay contains two million gallons (7.6 million liters) of water. The wave it generates contains 90, 000 gallons (341, 000 liters)of water.

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What are the measurements of Thunder Bay's pool?
36 feet (11 meters) wide, 250 feet (76 meters) long
50 feet (15 meters) wide, 200 feet (61 meters) long
84 feet (26 meters) across, 400 feet (122 meters) long
Thunder Bay measures 84 feet (26 meters) across at the deep end and is 400 feet (122 meters) long.

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How many water pumps does Thunder Bay have?
one
two
three
Thunder Bay has three pumps, at 100 horsepower, 200 horsepower and 300 horsepower respectively. The pump drives 40,000 gallons (150,000 liters) of water per minute.

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What is a valve seat?
the reservoir opening
Waves are generated by dumping huge amounts of pumped water from water reservoirs into the deep end of the pool. The valve seat is the opening between the reservoir and the pool.
the main part of the valve which prevents the water from releasing from the reservoir
the mechanism which pumps water into the reservoir

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What plugs and unplugs the valve seat?
an hydraulic pump
a valve plate
The valve plate, a piece of metal which fits snugly over the valve seat and moves across it, continually plugs and unplugs the valve seat.
the pump unit

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What makes the valve plate move?
an hydraulic-cylinder piston
The valve plate is attached to a metal strut, which is connected to an hydraulic piston and a steel beam. Pressurized oil is directed into the hydraulic piston, causing it to move with great force. This in turn moves the metal beam to which the valve plate is attached back and forth.
a motorized pump
the pressure from the water

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Why is Thunder Bay's hydraulic piston fuelled by vegetable oil instead of regular machine oil?
Machine oil is water soluble, while vegetable oil is not.
There is a risk that some oil may leak into the pool water.
An hydraulic pump sends a continual stream of vegetable oil into the hydraulic piston. Vegetable oil is used instead of regular machine oil, because there is a chance that some oil may leak into the pool water.
It is more cost effective when using such a large amount.

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In a hydraulic piston, if the pressure is higher on the left side, in which direction will the piston move?
right
A hydraulic pump sends oil into the piston from hoses on both sides of the piston head. When it pumps oil from the left hose, the pressure from the oil will be higher, pushing the piston to the right. When oil is pumped from the right hose, the pressure will be higher on the right side, pushing the piston head to the left.
left
forward

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What is a solenoid?
a type of motor
an electromagnetic switch controlled by an electric current
A solenoid is an electromagnetic switch controlled by an electromagnetic current. In this hydraulic piston, the piston is controlled by a solenoid, which works on a timer at two-minute intervals.
pressurized gas

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What is so amazing about this wave generating system?
It is extremely durable.
What is so amazing about this wave generating system is its durability. In the summer, the system is turned on at the crack of dawn and not shut down until the evening, every day of the week.
It uses a very small amount of electricity.
It moves tremendous amounts of water.

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