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LEED AP BD+C Exam, Version 4 > WE (Water Efficiency) Advanced 1 > Flashcards

WE (Water Efficiency) Advanced 1 Flashcards

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1
Q

What action is required first to achieve WE C3, Cooling Tower Water Use?

A

-hire a water treatment professional to conduct a one-time water analysis to identify the concentration parameters of the condenser water.

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2
Q

What 4 pieces of information about plumbing fixtures must be entered into the calculator when calculating the design case for indoor water use?

A
  • type of fixture
  • flush or flow rate
  • manufacturer and model
  • percentage of occupants using the fixture
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3
Q

Calculation for daily baseline water use…

A 
Women= 3 water closet uses
Men= 1 water closet use, 2 urinal uses
Faucet= 3 uses per day per FTE at 30 second use
Water Closet= 1.6gpf
Urinal= 1.0gpf
Faucet= .5gpm

Example: Calculate the daily baseline water use for an office space with 2 men and 1 woman.

2 x 1.6 = 3.2 gallons/day (men wc)
4 x 1.0 = 4.0 gallons/day (men urinal)
3 x 1.6 = 4.8 gallons/day (women wc)

Sink= (3 FTE x 3 uses/day x 30 seconds) / 60 seconds = 4.5
4.5 x 0.5 gallons/minute = 2.25 gallons/day

Total= 3.2 + 4.0 + 4.8 + 2.25 = 14.25 gallons/day

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4
Q

Indoor water use baseline case consists of what information?

A

Amount of water used based on only code minimum fixtures and fittings flow rates set by EPAct 1992

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5
Q

Projects pursuing points under WE C2, Indoor Water Use Reduction must show what?

A

Project fixtures in AGGREGATE meet the requirements

-WaterSense is a prerequisite, usage-based calculations are required for credit compliance

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6
Q

What must be metered to achieve WE P3, Building-Level Water Metering?

A

Building and grounds potable water use

-data must be shared with USGBC for 5 years

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7
Q

What fixtures can have the WaterSense label?

A
  • tank type toilets
  • water using urinals
  • PRIVATE lavatory faucets
  • shower heads
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8
Q

What fixtures do NOT have the WaterSense label?

A
  • tankless toilets
  • composting toilets
  • waterless toilets
  • waterless urinals
  • PUBLIC lavatory faucet
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9
Q

Acceptable sources of alternative water…

A
  • reverse osmosis reject water
  • foundation dewatering water
  • used process water

???

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10
Q

What flow rate is allowed for aerators?

A
  1. 8 gpm minimum

1. 5 gpm maximum

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11
Q

Maximum number of cycles calculation…

A

A

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12
Q

If a project plans to use a rain water collection system to offset indoor potable water use for toilet flushing, what does the project team need to include with the narrative?

A

Drawing highlighting the non-potable water system with the supply and demand calculations

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13
Q

How is building level water meter data shared with USGBC on a monthly basis?

A
  • through Energy Star’s Portfolio Manager

- through approved 3rd party data sources

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14
Q

How many prerequisites are there for WE Water Efficiency and what are they?

A

3 prerequisites

P1. Outdoor Water Use Reduction
P2. Indoor Water Use Reduction
P3. Building-Level Water Metering

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15
Q

How many credits are there for WE Water Efficiency and what are they?

A

4 credits

C1. Outdoor Water Use Reduction
C2. Indoor Water Use Reduction
C3. Cooling Tower Water Use
C4. Water Metering

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16
Q

What is required for meeting WE P1, Outdoor Water Use Reduction Option 1?

A

Demonstrate the landscape does not require a permanent irrigation system beyond a maximum of 2 years

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17
Q

Which pieces of information must be provided in the plant species and water requirement narrative for WE P1, Outdoor Water Use Reduction?

A
  • a description of the plants

- an indication of why the average rainfall will be sufficient

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18
Q

What is required for meeting WE P1, Outdoor Water Use Reduction Option 2?

A

30% reduction in irrigation from baseline for peak watering month

19
Q

What is the requirement for meeting WE P2, Indoor Water Use Reduction?

A

20% AGGREGATE water consumption reduction from baseline

20
Q

What defines exemplary performance for WE P2, Indoor Water Use Reduction?

A

55% AGGREGATE water consumption reduction from baseline

21
Q

For WE P2, Indoor Water Use Reduction, what are the allowable water usage rates for fixtures?

A
  • toilet= 1.6 gpf
  • urinal= 1.0 gpf
  • public lavatory= 0.5 gpm at 60 psi
  • private lavatory= 2.2 gpm at 60 psi
  • kitchen faucet= 2.2 gpm at 60 psi
  • shower head= 2.5 gpm at 80 psi
22
Q

For WE P2, Indoor Water Use Reduction, what are the prerequisite requirements for cooling towers and evaporative condensers?

A

Equipment must have:

  • makeup water meters
  • conductivity controllers and overflow alarms
  • efficient drift eliminators
23
Q

If a project is using the prescriptive path for WE P2, Indoor Water Use Reduction and NOT pursuing any credits for WE C2, Indoor Water Use Reduction what information must be documented?

A

-product cut sheets and fixture schedules showing all fixtures are WaterSense labeled

24
Q

What water-using equipment is allowed to be excluded from WE P2, Indoor Water Use Reduction?

A
  • equipment related to human consumption
    • such as soda machines and coffee machines
  • fixtures used for filling sinks that wash produce
  • janitor sinks

???

25
Q

What are the requirements for WE P1, Building Level Water Metering?

A
  • Install permanent meters to measure total POTABLE water usage for the BUILDING and the associated GROUNDS.
  • Data must be compiled into monthly and annual reports which shall be shared with USGBC for a 5 year period.
  • When public meters are restricted, project must install meters DOWNSTREAM or potentially submit monthly billing statements as an alternative???
26
Q

What are the 2 options for WE C1, Outdoor Water Use Reduction?

A

Option 1. No irrigation required

Option 2. Reduced irrigation

27
Q

To achieve points for WE C1, Outdoor Water Use Reduction Option 2 what is required?

A
  • 50% reduction from baseline (prerequisite already requires 30% reduction, goal is to find another 20%)
  • credit uses technology and alternative water sources WHEREAS the prerequisite uses plant selection and design
28
Q

What non-potable water is acceptable for to achieve points for WE C1, Outdoor Water Use Reduction Option 2?

A

Graywater and rainwater

29
Q

When using alternative water sources for irrigation what should the water be tested for?

A

Salinity levels which can be harmful

30
Q

To achieve points for WE C1, Outdoor Water Use Reduction Option 2 what technology automatically earns 15% reduction?

A

The use of smart irrigation controls that meet WaterSense criteria

31
Q

Define PRIVATE LAVATORY FAUCET

A

Refers to hotel rooms or patient rooms lavatories only. All others are considered public.

32
Q

For WE P2, Indoor Water Use Reduction which fixtures are required to have WaterSense labels?

A

-toilets, urinals, PRIVATE lavatory faucets, and shower heads

33
Q

Define XERISCAPING

A

Landscape practice of not using or reducing the need for irrigation

34
Q

What is the formula for make-up water in a cooling tower?

A

Make-up = Evaporation + Blowdown + Drift

35
Q

What is the ideal temperature for hot water?

A

120 degrees (down from the typical 140 degrees)

36
Q

What are some possible simple payback durations and water reduction (%) for:

  1. Waterless Urinals
  2. Dual flush toilets
  3. Ultra Low Flow Showerheads
A

Potentially in the range of:

  1. 3 years (14% water reduction)
  2. 2.8 years (10% water reduction)
  3. 1.5 years
37
Q

For WE P1, Outdoor Water Use Reduction 30%, what must the reduction come from?

A

The first 30% reduction must be achieved through plant selection and irrigation efficiency only.

38
Q

For WE P2, Indoor Water Use Reduction 20%, what must the reduction come from?

A

The first 20% must be achieved through the use of efficient fixtures only.

39
Q

Stop on page 79

A

A

40
Q

WE C2 Adaptions

A

Pg 82

41
Q

What are the requirements to earn points for WE C4, Water Metering?

A

Projects must include permanent water meters for 2 or more of the following:

  1. Irrigation, meter water serving at least 80% of the irrigated landscape area
  2. Indoor, meter water systems serving at least 80% of indoor fixtures
  3. Domestic Hot Water, meter water use of at least 80% of the installed hot water heating capacity
  4. Boilers, meter annual water use greater than 100,000 gallons
  5. Reclaimed Water, meter regardless of rate
  6. Processed water, meter 80% of process water
42
Q

WE C4 Healthcare Adaption

A

Pg 86

43
Q

Define CYCLES OF CONCENTRATION

A

Calculated ratio of concentration of dissolved solids in the blowdown water compared to the make-up water.

44
Q

Maximizing what will minimize blowdown water quantity and reduce make-up water demand on cooling towers?

A

Cycles of concentration, most systems operate at 2 to 4 cycles while 6 cycles is possible. Increasing cycles from 3 to 6 reduces make-up water by 20% and blowdown by 50%

LEED AP BD+C Exam, Version 4 (16 decks)

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