Page 168 - The Green Building Bottom Line The Real Cost of Sustainable Building

LEARNING FROM A LEED PILOT PROJECT 147

TABLE 5.2 CIRCUIT CITY WATER USAGE COMPARISON

CIRCUIT CITY BASELINE WATER USAGE (NON-LEED DESIGN)
VOLUME TOTAL
FIXTURE USES/DAY DURATION FLOW RATE (GAL/USE) (GAL/USE)
Toilets 96 1 flush 1.6 gal 1.6 153.6
Urinals 48 1 flush 1 gal 1 48
Lavatories 144 1 cycle .25 gal .25 36

Daily Water Use 238 gal/day
Operating Days per Week 6.5 days
Baseline Potable Water Use 80,309 gal/yr
Baseline Black Water 68,141 gal/yr

CIRCUIT CITY DESIGN CASE WATER USAGE (LEED DESIGN)

VOLUME TOTAL
FIXTURE USES/DAY DURATION FLOW RATE (GAL/USE) (GAL/USE)
Toilets 1.6 gpf 48 1 flush 1.6 gal 1.6 76.8
Toilets 0.8 gpf 48 1 flush 0.8 gal 0.8 38.4
Urinals 48 1 flush 0 gal 0 0
Lavatories 144 1 cycle .13 gal .13 18

Daily Water Use 133 gal/day
Operating Days per Week 6.5 days
Baseline Potable Water Use 45,022 gal/yr
Baseline Black Water 38, 938 gal/yr

Circuit City Water Savings (LEED vs. Non-LEED) 35,297 gal/yr
Circuit City Percentage Potable Water Reduction 44%
Circuit City Percentage Black Water Reduction 43%