Hello All,
I am working on an urban redevelopment project that was not designated as a zero lot line. We are proposing a rainwater harvesting system for building re-use and irrigation. For the 90th percentile storm, we need to capture approximately 4,000 CF of rainwater and are cisterns have about 7,000 CF of capacity. However, we are only able to capture about 85% of our LEED boundary as we have a section of sidewalk and boulevard that will directly drain into the adjacent street. Does this mean we do not get any of the credits because we are not managing 100% of the design storms as there is some direct runoff? Has anyone ran into this before? I imagine I'm not the only one who hasnt been able to capture 100% of the site.
David Posada
Integrated Design & LEED SpecialistSERA Architects
LEEDuser Expert
1980 thumbs up
December 3, 2021 - 2:15 pm
Matthew, are the sidewalk and boulevard in the public right of way? If those are not within the property line, the project doesn't usually have control of that stormwater management, so you may not want to include that within the LEED boundary. Project teams have some flexibility with how we define the LEED boundary as long as it's reasonable and consistent, and we're not manipulating the boundary in illogical ways to avoid a requirement.
matthew isakson
December 7, 2021 - 2:23 pm
I think we can revise the boundary slightly! But am i interpreting the code correctly in the fact that 100% of the boundary needs to be captured up to the 80th,85th,90th percentile design storms? We are not allowed any direct runoff anywhere?