Page 139 - The Engineering Guide to LEED-New Construction Sustainable Construction for Engineers

LEED W ater Ef ficiency 119

FIGURE 3.2.1 Waterless urinal installed in the LEED certifi ed public health building at the
University of South Carolina, Columbia, S.C. (Photograph taken July 25, 2007.)

fixtures in the United States. Therefore, they have different maintenance and waste collection
needs than more common water closets and urinals. The designers and owners should be
very cognizant of the different maintenance needs, and it is recommended that they
determine a way to meet these special needs early in the design phase of a project so that
there are no additional concerns, costs, or changes later in the project. Figure 3.2.1 is a photo
of a waterless urinal.
To perform the calculations, the non-gender-specific occupancies should be
established as previously defined in Chap. 2. Occupancies must be consistent throughout
a LEED submittal for a project. The calculations for WEc2 Option 1 are different for
commercial and institutional uses than for residential uses and are summarized in the
following sections.
Option 1: Commercial and Institutional Uses In a similar fashion to the calculations for
occupancies in Chap. 2, the following definitions are given:
FTE Full-time equivalent building occupant during shift j
j
FTE Full-time equivalent building occupancy of employee i during shift j. This is
j,i
equal to 1 for a full-time employee and is equal to the normal hours worked
(less than 8) divided by 8 for a part-time employee. Obviously, this will need
to be modified if shifts are different from the standard 8 h.