Water Efficiency

Question 1

WEp1 + WEc1 - Outdoor Water Use Reduction

Answer 1

Prereq: 30% water use reduction
1 point for 50% reduction
2 points for 100% reduction

Question 2

WEp2 + WEc2 - Indoor Water Use Reduction

Answer 2

Prereq: 20% water use reduction

1-6 points given for reductions 25%-50%, increments of 5

Question 3

WEp3 - Building Level Water Metering

Answer 3

Intent: locate and reduce water leakage in system

All potable water sources must be metered
e.g. public supply, on-site well and on-site potable water treatment systems

Must share annual summaries w/USGBC every 5 years

Question 4

WEc4 - Submetering

Answer 4

Intent: locate and reduce water leakage in system

Requires 2 or more permanently installed system-level water meters for the following subsystems:
1. Irrigation water (80% of area)
2. Indoor plumbing fixtures and fittings (80%+)
3. Domestic hot water (80%+)
4. Boilers that use 100,000+ gal/yr
5. Reclaimed water (100%)
6. Process water (80%+)
    Humidification systems
    Dishwashers
    Clothes washers
    Pools

Question 5

WEc3 - Cooling Tower Water Use

Answer 5

Intent: maximize the amount of times water can cycle through the system before being removed by blowdown.

Requires one-time potable water analysis to determine the concentration of at least 5 dissolved solids and ensure max limits are not surpassed.

Question 6

Blowdown

Answer 6

Concentrated water in cooling towers; water evaporates and causes scaling. Needs to be removed and replaced with makeup water

Question 7

Evapotranspiration

Answer 7

The process by which water is transferred from land to atmosphere via evaporation from soil and other surfaces and transpiration from plants