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Plumbing Level 3 > B4: Green Water Supply Systems > Flashcards

B4: Green Water Supply Systems Flashcards

1
Q

What is Rain Water Harvesting?

A

is the practice of collecting / storing rainwater for future use

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2
Q

Where does the water collect from?

A

roofs

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3
Q

Harvested rain water can be used for what?

A

toilet flushing and lawn irrigation (also urinals)

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4
Q

Other uses of rain water are not allowed unless.

A

Treated, inspected / certified

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5
Q

Harvested or recovered rainwater commonly refers to?

A

A type of auxiliary water supply that is collected from external surfaces of buildings or other hard-surfaced areas not exposed to vehicular or pedestrian traffic

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6
Q

What is water quality determined by?

A

Its microbiological, chemical
physical properties

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7
Q

What does physical properties include?

A

pH, colour, odour, turbidity and bacteria

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8
Q

Rainwater has the potential to harbour what types of organisms?

A

pathogenic

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9
Q

Who should you check with prior to installation / enquire about permits?

A

AHJ

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10
Q

What are the 3 benefits of RWH?

A

1) protecting / conserving water
2) reducing amount of storm water runoff
3) Reducing homeowners’ potable water use

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11
Q

True or False: roofs are the only surface permitted for residential rainwater collection

A

True

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12
Q

Why is collection from asphalt roofs not great?

A

dt its rough surfaces, tendency to slow down / evaporate surface water, particulates / other contaminates can dislodge

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13
Q

Are green roofs recommended for rainwater harvesting?

A

no

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14
Q

What style are most gutters?

A

5” K style aluminum or galvanized steel

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15
Q

What size are typical leaders?

A

2x3” or 3x3”

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16
Q

Where shouldn’t leaders be located?

A

Inside corners of walls or inside the building envelope (unless absolutley necessary)

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17
Q

What is a conveyance pipe?

A

a pipe that transports rainwater from leader to storage tank

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18
Q

What must be taken into consideration when conveyance pipe is located above ground?

A

above grade / sun exposure

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19
Q

What needs to be considered when designing / installing a conveyance network?

A

Sizing / placement
site conditions / location / placement of storage tank

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20
Q

What type of material is not recommended for gutters/leaders?

A

copper, wood, vinyl plastic
(rainwater can be acidic which can affect copper)

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21
Q

True or False: the greater the slope the better

A

true

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22
Q

What materials are used for storage tanks?

A

high-density polyethylene
fibreglass, steel, concrete / crate and bag

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23
Q

What are the benefits of the different storage tank materials?

A

Concrete = longevity / strength
Plastic / fibreglass = lightweight / strong
Steel = corrosion / aesthetics
crate - and-bag = light / strong (not normally used)

24
Q

Tank sizing includes what?

A

rainwater load, number of toilets, irrigation, roof catchment area, local rainfall, potential growth, number of people in the house

25
Q

What is collection effeiciency?

A

the % of rainfall landing on the roof that will find its way to the storage tank

26
Q

What is the average collection effeciency?

A

75%

27
Q

What are reasons for lost effeciency?

A

1) roof material, overhanging branches
2) collection system (overflow / spillage)
3) Seasonal factors

28
Q

1 metre squared of catchment area x 1mm = how many L?

A

1L

29
Q

What size of access hatch is needed?

A

24” or larger – allows entry

30
Q

Does an overflow pipe need to be larger, smaller or the same size as inlet pipe?

A

Same size or larger

31
Q

What is a calmed inlet?

A

conveyance pipe is brought near to the bottom w/o disturbing the sediment (is 90 degrees or U shaped)

32
Q

What is dead space?

A

the 4-6” unused portion of rainwater at the bottom of the storage tank

33
Q

What is the dead space’s job?

A

to ensure the submersible pump or suction line does not run dry

34
Q

How often should rainwater tanks be inspected?

A

at least once a year

35
Q

What are 2 ways treatment can be applied to improve rainwater quality?

A

Pre-storage tx
Post-storage tx

36
Q

What are 3 methods of Pre-storage tx?
(For fuck sakes)

A

1) First flush diversion
2) Filtration
3) Settling

37
Q

What is the First Flush diversion?

A

diverting the first portion of runoff away from the storage tank

38
Q

What does filtration include?

A

Involves screening out leaves / large debris from runoff

39
Q

Settling chamber, what is it?

A

A rainwater tank that has a separate chamber for debris to settle and water to con’t to the storage tank

40
Q

What is Post-storage tx include?
(DTF)

A

1) filtration
2) disinfection
3) tx of aesthetic issues - colour, taste, odour

41
Q

What is commonly used for disinfection?

A

UV and chlorine

42
Q

Pre-storage tx devices should be inspected how often?

A

at least twice a year (or as per manufactures instructions)

43
Q

How often should post-storage tx devices be inspected?

A

at least quarterly

44
Q

What is the primary concern w/ a make up system?

A

requires a potable water source to be brought in close proximity w/ rainwater which creates a CC

45
Q

What are 2 types of Make-up water systems?

A

1) top up - uses potable water to fill storage tank when needed
2) bypass

46
Q

What are 2 areas of protection that the installation of backflow preventers address?

A

1) zone isolation
2) premise protection

47
Q

What is a zone isolation?

A

backflow preventer is installed at the point of use
protects occupants in building

48
Q

A zone isolation backflow preventer uses what for a rainwater storage system

A

air gap

49
Q

Premises protection

A

uses an air gap?

50
Q

What is the point of a pressure tank?

A

To prolong pump life

51
Q

Pump selection involves what?

A

Pump location, controller, voltage
pump flow rate (l/sec or GPM)
pump system head (pressure)

52
Q

What are the 3 components of total dynamic head
(FDS)

A

1) suction head
2) Discharge head
3) friction head

53
Q

What is suction head?

A

the vertical distance or height that water must be lifted (pulled) before arriving at the pump.
only applies to Jet pump

54
Q

What is Discharge head?

A

the vertical height from the pump –> the highest fixture

55
Q

What is Friction head?

A

the loss in pressure resulting from water traveling through pipes / fittings

56
Q
A

Plumbing Level 3 (26 decks)

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