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NC-v4 SSc4:Rainwater management

Zero lot line projects

Path 3 states: "manage on site the runoff from the developed site for the 85th percentile ". I guess this requirement was made to exclude the sidewalk from calculations. Am I reading this correctly?

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Profile picture for user tbackhus
Theresa Backhus
Sites Technical Specialist, LEED
USGBC
LEEDuser Premium Member
47 thumbs up

Tue, 04/21/2015 - 17:34

Hi Gustavo, You will need to manage the runoff from all areas within the LEED project boundary. If the sidewalk is within the project boundary, it needs to be included.
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Ciaran McCabe
Director
Passive Dynamics Sustainability Consultants
LEEDuser Basic Member
12 thumbs up

Wed, 06/19/2019 - 16:15

I am working on a project that consists of two office buildings which are tight to the sight boundary but there is some open space between the two buildings. I presume this can't be considered as zero lot line ? For zero lot projects does the buildings need to be tight to the property line. ?   
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Dave Hubka
Practice Leader - Sustainability
EUA
LEEDuser Expert
510 thumbs up

Wed, 06/19/2019 - 16:58

the v4.1 BD+C reference guide defines 'zero lot line' as building footprints that cover 90% or more of the site. 
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Ciaran McCabe
Director
Passive Dynamics Sustainability Consultants
LEEDuser Basic Member
12 thumbs up

Wed, 06/19/2019 - 17:02

Thanks David. 
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Ciaran McCabe
Director
Passive Dynamics Sustainability Consultants
LEEDuser Basic Member
12 thumbs up

Thu, 06/20/2019 - 16:19

Just one further question. How do you calculate your building footprint when you have 2 levels below grade. For example the basement might take up the whole site but the ground floor footprint will be smaller ? Is there any guidance on this ?
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Dave Hubka
Practice Leader - Sustainability
EUA
LEEDuser Expert
510 thumbs up

Thu, 06/20/2019 - 23:52

footprint of ground floor should be used. 

Mon, 05/16/2022 - 17:57

David, It looks like the zero lot line definition is removed in the October 2021 version of the reference guide. Has anything changed?
Profile picture for user Dave.Hubka_2
Dave Hubka
Practice Leader - Sustainability
EUA
LEEDuser Expert
510 thumbs up

Mon, 05/16/2022 - 18:10

Not to my knowledge.

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