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LHAP Year 2-3 > Water and Light > Flashcards

Water and Light Flashcards

1
Q

Small water features are more prone to the accumulation of? Which can be toxic to fish.

A

Carbon dioxide

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2
Q

What factors should be investigated in the design of a residential water feature?

A

Desired sound level, local regulations, access to power

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3
Q

Which flexible water liner has the longest expected life span in the prairie climate ?

A

EPDM

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4
Q

Why would you choose to install a floating heater in a water feature?

A

To help fish overwinter by allowing CO2 to be released.

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5
Q

What can you finish the edge of a water feature with?

A

Pebble Beach, indigenous rock, complementary plant material.

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6
Q

For optimum performance hardy water lilies require how many hours of direct sunlight?

A

5-6 hrs

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7
Q

One of the steps in balancing the ecosystem in water features includes?

A

Add oxygenating plants to the pond

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8
Q

Which water feature liner is most susceptible to punctures and deterioration from UV rays ?

A

Polyethylene

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9
Q

To help keep a water feature in balance, what percent of the surface should be covered by water lily leaves and floating aquatic plants?

A

50-75%

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10
Q

How many days should chlorinated water sit in a water feature prior to adding fish and plants?

A

2 days

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11
Q

If a single lamp fails during a low voltage system test, what should be done first?

A

Test the failed lamp

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12
Q

What is the typical function of a bollard fixture?

A

Lighting walkway or driveway

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13
Q

Which type of lighting will highlight the texture of a fence?

A

Accent

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14
Q

How would you describe a GFI

A

Provide protection against electrical shock. Shut off power if a bare wire touches a ground object. Monitors the flow of electrical current in the circuit.

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15
Q

How can you reduce the voltage drop in a lighting system installation?

A

Change from 12-2 cable to 10-2 cable

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16
Q

When laying out a lighting system, where should the transformer be located?

A

In the center of the design

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17
Q

How do you go about installing the low voltage cable for a lighting system?

A

Start at the transformer and work out to the last fixture. Lay cable on soil surface. Bury the cable 10-15cms

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18
Q

Some standard actions for the maintenance of a low voltage lighting system would be?

A

Remove dust. Prune adjacent plant material. Spray silicone lubricant in light sockets.

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19
Q

At what stage should maintenance for a low voltage lighting system begin?

A

Design phase.

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20
Q

Is water probably the most versatile and adaptable element you can introduce in a landscape; true or false?

A

True.

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21
Q

Water features must be constructed in full sun and receive at least 6hrs of direct sunlight; true or false?

A

FALSE

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22
Q

All water features will have a large open body of water as part of their design/construction; true or false?

A

FALSE

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23
Q

Water features can be designed in a either a formal or informal shape; true or false?

A

TRUE

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24
Q

Water features do not need to match the scale of the propertyl, existing landscape and building elements and the kinds of plant material you want to inhabit the water; true or false?

A

FALSE

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25
Q

In some cities or municipalities, a permit will be required to install a water feature; true or false?

A

TRUE

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26
Q

In some cases, small water features are ideal because they require less maintenance than larger installations; true or false?

A

FALSE

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27
Q

Protecting property is a major reason for the installation of night lighting; true or false?

A

TRUE

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28
Q

Nightscape lighting should look as natural as possible; true or false?

A

TRUE

29
Q

Lighting looks best when the source is hidden; true or false?

A

TRUE

30
Q

Downlighting is used to focus on a particular plant or specific area in the landscape; true or false?

A

FALSE

31
Q

Contour lighting is a form of downlighting used mainly for safety; true or false?

A

TRUE

32
Q

Shadow lighting is similar to silhouetting except that the light source will be placed behind the object; true or false?

A

FALSE

33
Q

Perspective lighting is often used to make a garden space seem smaller than it really is?

A

FALSE

34
Q

Preformed or molded ponds are manufactured from polyethylene or fiberglass; true or false?

A

TRUE

35
Q

Concrete is the ideal choice for pond construction on the prairies; true or false?

A

False. Concrete cracks.

36
Q

A bubbling rock installation is a fast and relatively easy water feature to install; true or false?

A

TRUE

37
Q

Some water feature pumps can be left in the feature to solid without harming the pump; true or false?

A

True. Newer pumps can be frozen.

38
Q

Pond skimmers and biofalls are considered mechanical filters; true or false?

A

FALSE

39
Q

How would you describe a pounded earth pond?

A

Built on sites with clay subsoil. Suitable for large scale installations. Require a steady source of water.

40
Q

What kind of pond lining can be welded to create a variety of shapes?

A

Butyl rubber

41
Q

What is one of the most valuable characteristics of EPMD

A

It remains flexible at extremely low temperatures.

42
Q

When choosing a pump for a water feature, what should you look for ?

A

A pump that can move a minimum of 2x the volume of the water feature/hour

43
Q

What is average lifespan of a L.E.D

A

50,000hrs

44
Q

What is the average lifespan of a halogen lamp

A

3000hrs

45
Q

What is the average lifespan of an incandescent light

A

1200hrs

46
Q

An incandescent lamp converts most of the energy that is put in to it into heat. What % is converted to heat on average?

A

90%

47
Q

A GFI will shut off the power in the event of a short within

A

1/40 of a second

48
Q

Voltage drop formula?

A

VD = ( total watts on cable X length of run I’m feet ) / cable size constant

49
Q

Voltage drop for 100’ of #12 cable with four 26-watt lamps, cable constant of 7500

A

1.33

50
Q

How wide and deep should the marginal shelves be in a pond?

A

30cm deep and 30cm wide

51
Q

The hole for a preformed pond should be how much wider than the pond itself?

A

8cm

52
Q

The walls of a water feature should have a angle of ?

A

30 degrees

53
Q

What ratio of height to length is a aesthetically pleasing for a natural water feature

A

1:3

54
Q

How can is a waterfall tuned

A

Add smoother rocks, modify the angle of the water, add an echo chamber.

55
Q

What kind of soil is needed for bog plants to survive

A

1:1 mix of loam and OG

56
Q

Formula for volume

A

Length x width = surface area
Surface area squared x depth= volume

57
Q

Constant to convert volume into imperial gallons

A

6.25

58
Q

Constant to convert volume into US gallons

A

7.5

59
Q

The cable for low voltage lighting needs to be protected in conduit?

A

No

60
Q

Wire connectors must be CSA approved for outdoor use

A

Yes

61
Q

30-45cm of wire should be coiled and left at the transformer and at each light fixture

A

Yes

62
Q

Do transformers need to be connected to a socket with a GFI

A

Yes

63
Q

What % of water needs to be replaced at one time

A

10%

64
Q

What is the typical amount of evaporation from a water feature

A

3-5cm

65
Q

How long do the blooms of a deep water lily last

A

3 days

66
Q

Why would you add native water to a pond as part of the balancing process?

A

To inoculate the pond with natural, beneficial bacteria and other aquatic life.

67
Q

Cable for lighting needs to be replaced every 3-5 years

A

No

68
Q

What lighting systems are resistant to road salt damage

A

Bronze, copper, cast aluminum.

LHAP Year 2-3 (12 decks)

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