Water Efficiency

Question 1

Water efficiency in commercial buildings can easily reduce water usage by ___% or more.

Answer 1

30%

Question 2

______ water is used for building systems such as cooling towers, boilers and chillers

Answer 2

Process

Question 3

_____ water comes from bathtubs, bathroom wash basins, & clothes washers.

Answer 3

gray water

Question 4

Water from kitchen sinks and dishwashers is considered ________ water

Answer 4

black water

Question 5

Water from ____ and _____ is always considered black water

Answer 5

Toilets and urinals

Question 6

What are three common sources of Non-Potable water?

Answer 6

Household gray water (untreated)
Captured rainwater
Non-potable treated by public agency

Question 7

What are two uses of Non-Potable water?

Answer 7

Irrigation and Toilet/Urinal Water

Question 8

Name two states that ban the capture or use of rainwater?

Answer 8

Colorado and Nevada (Las Vegas)

Question 9

What is the prerequisite for Water Use Reduction?

Answer 9

Reduce by 20%

Question 10

What is the reference authority for Water Reduction?

Answer 10

Energy Policy Act (EPAct) 1992

Question 11

What are four examples of non-regulated fixtures?

Answer 11

Washing machines, dishwashers, irrigation, process water

Question 12

What are three factors that do NOT change when calculating Water Reduction?

Answer 12

FTE, Number of Fixtures, Number of uses/day

Question 13

The two options for reducing potable water use for irrigation?

Answer 13

Option 1 (2 points) Reduce potable water use by 50%. (Use 50% gray water)
Option 2 (4 points) Reduce potable water use by 100% AND reduce total water by 50%. (Use gray water and cut use by 50%)

Question 14

What are the two plant species factors?

Answer 14

Herbaceous Perennials (Drought tolerant plants) and Xeriscaping (Dry-Scaping; landscape design that minimizes water use)

Question 15

What are four stategies for Water Efficient Landscaping?

Answer 15

Plant species factor or selection, Plant Density Factor, Irrigation Efficiency, Non-Potable Water Reuse.

Question 16

What is evapotranspiration?

Answer 16

Loss of water by evaporation from soil and transpiration from plants

Question 17

What is “Reference Evapotranspiration Rate” (ET0)?

Answer 17

Amount of water necessary to grow a reference plant

Question 18

What is “Landscape Coefficient”

Answer 18

The volume of water loss via evapotranspiration. (dependent on species, density & climate)

Question 19

Landscape Coefficient (Kl) is equal to what?

Answer 19

(Ks) Species x (Kd) Density x (Kmc) Microclimate (McDs)

ETO = Regional Evapotranspiration and stays constant)

Question 20

What are four Water Efficient Landscaping factors that change in Base Case and Design Case?

Answer 20

Density, Species, Irrigation Efficiency, Potable Water Use & Non-Potable Water Use

Question 21

What are two Water Efficient Landscaping factors that do NOT change in Base Case and Design Case?

Answer 21

Microclimate factor and Reference Evapotranspiration Rate

Question 22

What is the intent of Innovative Wastewater Technology?

Answer 22

To reduce wastewater and potable water demand

Question 23

What are two “Innovative” options for reducing wastewater and potable water demand? (Worth 2 credits)

Answer 23

1- Reduce potable water used for toilets by 50% (EP 100%) by conservation or by using non-potable water.
2- Treat 50% (EP 100%) of wastewater on site to tertiary standards

Question 24

What is the EPAct 1992 max allowable flow rate for toilets? Rate for Urinals?

Answer 24

1.6 gpf toilets, 1.0 gpf urinals

Question 25

What are the low flow gpf rates for toilets and urinals?

Answer 25

Dual flush 1.6 gpf/.8 gpf for toilets and .5 gpf for urinals or 0 for waterless urinals.

Question 26

What are the 3 factors that change between the base case and design case for water use calcs?

Answer 26

Gray water use, Plumbing fixture consumption (EPAct 1992 vs Actual) and Water Treatment

Question 27

What are the 3 factors that do NOT change between the base case and design case for water use calcs?

Answer 27

FTE, number of plumbing fixtures & number of bathroom trips per day.

Question 28

What is the prerequisite percent reduction of water use?

Answer 28

20%

Question 29

What is the water use percent reduction required for EP?

Answer 29

45%

Question 30

What is the water use percent reduction required for 2 points, 3 points and 4 points?

Answer 30

30%. 35%, 40%

Question 31

How many urinal/toilet flushes per day for men? Women?

Answer 31

2 Urinal + 1 Toilet for Men. 3 toilet for women

Question 32

How do you calculate the Local Evapotranspiration Rate? (ETl)

Answer 32

Kl x ETo = ETl (Landscape Coefficient x Reference Evapotranspiration Rate = Local Evapotranspiration Rate)

Question 33

For Process Water Reduction (Schools Only) what are 3 requirements?

Answer 33

1- No refrigeration equipment that uses water for cooling.
2- No garbage disposals
3- Must use 4 process equipment items that reduce water use 20%

Question 34

What are 4 examples of equipment that reduce process water>

Answer 34

Clothes washer - 7.5g/ft3 per cycle
Dishwahers - 1g per rack
Ice Mach - > 175 lbs/day 20g per 100lbs
Ice Mach - < 175 lbs/day 30g per 100lbs
Food Steamers - 2g per hour
Pre-rince spray valves - 1.4 g per min

Question 35

For EP on Process Water, what % water savings?

Answer 35

40%