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ND-v2009 GIBp3:Minimum building water efficiency

Baseline equal to zero

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Karyn Rodrigues
Senior consultant, LEED AP ND & BD+C
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LEEDuser Basic Member
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Hi, I have three buildings within the LEED ND boundary, and one of them is not going to pursue any green building certification. In this building, the owner has no control over what will be installed, regarding water fixtures, fittings and appliances. This way, can I consider the water consumption of its fixtures equal to the baseline? Thus, the contribution of this building, in the weighted average, is zero and the other two buildings, necessarily, should have more than 20% of water savings to achieve the prerequisite.

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Eliot Allen
LEED AP-ND, Principal
Criterion Planners
LEEDuser Expert
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Thu, 10/10/2013 - 20:41

Karyn, yes, it sounds like you've got it right. Assuming all the buildings are either non-residential, mixed-use, or multi-family residential four stories or more, the weighted average equals each building's percent water reduction multiplied by its percent of total floor area, then summed. For example, a hypothetical Bldg 1 of 10,000 sq ft with 30% water reduction, Bldg 2 of 5,000 sq ft with 20% reduction, and Bldg 3 of 5,000 sq ft with zero reduction, would have a weighted average water reduction of 20%, i.e. (50% * 30%) + (25% * 20%) + (25% * 0%) = 20%. Eliot
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Karyn Rodrigues
Senior consultant, LEED AP ND & BD+C
Arup
LEEDuser Basic Member
10 thumbs up

Thu, 10/10/2013 - 21:17

Thank you Eliot, great news for us, then! Now, another question has came up: is it possible to assume the same approach for the GIBp2 - Minimum building energy efficiency? Example: I assume that if my energy efficiency is equal to the baseline, then I don't need to perform an energy simulation modeling for the building and I only include it in the weighted average calculation. Is that correct?
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Eliot Allen
LEED AP-ND, Principal
Criterion Planners
LEEDuser Expert
231 thumbs up

Thu, 10/10/2013 - 22:57

For GIBp2 there are two approaches, one weighted and one not weighted, depending on the documentation method used.

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