I have a facility that will be LEED NCv2009 certified and is part existing and partly new. The existing fixtures include 2 showerheads, 10 WC, 2 Urinals, 8 Lavatories, however the new addition includes 6 showers, 4 lavatories and 4 WC. In the water efficiency calculation, should I set FTE to use existing fixtures and then FTE to use new fixtures? then set visitors to use existing fixtures and then visitors to use new fixtures? or should I set the calculation to adjust the usage proportional to the ratio of existing to new fixtures.?

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Charles Nepps

NH Green Consulting

LEEDuser Premium Member

80 thumbs up

Tue, 12/29/2015 - 20:16

If the flow rates of the new and old fixtures are the same, and all FTE have access to all fixtures, then there is no need to separate the existing from the new. If the existing fixtures are less efficient than the new fixtures, then setting the flow rate in the calculator based on a weighted average of the fixtures, would be appropriate. For example if your existing WC`s are 2 gpf and the new WC's are 1.5 gpf then the weighted average would be: ((10*2) + 4*1.5))/ 14 or 1.86 gpf average.

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