Page 154 - The Engineering Guide to LEED-New Construction Sustainable Construction for Engineers

134 Cha pte r T h ree

5. You are building an office building for 150 men and 100 women. Shower facilities will be
provided for those who exercise before work or during lunch. You do not want to use automatic
controls on the lavatory faucets.
A. Calculate a baseline water usage.
B. To be more green, you decide to go with the HET single flush gravity water closets, waterless
urinals, and low-flow showers. Perform calculations to determine the points you might
obtain for LEED 2009 WEc2 and WEc3.
6. You are building an office building for 150 men and 100 women. Shower facilities will be
provided for those who exercise before work or during lunch. You decide to use automatic controls
on the lavatory faucets.
A. Calculate a baseline water usage.
B. To be more green, you decide to go with the HET single flush gravity water closets, waterless
urinals, and low-flow showers. Perform calculations to determine the points you might
obtain for LEED 2009 WEc2 and WEc3.
7. You are building an apartment complex with 80 three-bedroom units near an elementary
school. The facility will include a playground and pool complex. The designers estimate that there
will be on average 4.0 occupants in each apartment.
A. Calculate a baseline water usage.
B. To be more green, you decide to go with the dual flush water closets, low-flow kitchen sinks,
and low-flow showers. Perform calculations to determine the points you might obtain for
LEED 2009 WEc2 and WEc3.

8. You are building an apartment complex with 80 three-bedroom units near the downtown
office district. The designers estimate that there will be on average 3.5 occupants in each
apartment.
A. Calculate a baseline water usage.
B. To be more green, you decide to go with HET single flush gravity water closets, low-flow
showers, and low-flow kitchen sinks. Perform calculations to determine the points you
might obtain for LEED 2009 WEc2 and WEc3.
9. You are building an industrial building for a mixed workforce. The day shift will have about
150 employees, and about 20 employees will be needed to work both the swing and the graveyard
shifts to keep the machines running. Shower facilities will be provided. You originally do not want
to use automatic controls (metering) on the lavatory faucets.
A. Calculate a baseline water usage.
B. You have heard about the new dual flush water closets and decide to use them in the
women’s rooms. You also decide to go with low-flow urinals. Which LEED 2009 WE points
might you earn?
C. What additional changes might need to be made to earn the exemplary performance point
for LEED 2009 WEc3?
10. You are building an industrial building for a mixed workforce. The day shift will have about
200 employees, and about 20 employees will be needed to work both the swing and the graveyard
shifts to keep the machines running. Shower facilities will be provided. You originally want to use
automatic controls (metering) on the lavatory faucets.
A. Calculate a baseline water usage.
B. Your design will be using HET single flush pressure assist water closets, low-flow urinals,
and low-flow showers. What LEED 2009 WE points might you earn?
C. You would like to earn the EP point for LEED 2009 WEc2 by plumbing graywater or
rainwater to the water closets and urinals. What minimum average monthly volume of
these waters will you need to provide in order to accomplish this?