Airport base ratio ?

Hi Bouygues, great question. I have not yet run into an airport under v4 so can't report back on any direct project experience but I would contact GBCI to confirm direction on this one.

Hello,

Did you have an answer from GBCI on that?

Thanks

I'm have the same problem with a Cruise Terminal. There isn't a base ratio for any transportation building type. How did you figure out the base ratio for the airport project?

HI everyone, I have the same problem with a DATA CENTER. Do I have to Choose "industrial park" or "warehouse" ? And do I have to use "TABLE 1 - Base Ratios for parking spaces" or "Institute of Transportation Engineers’ Transportation Planning Handbook, 4th edition, Table 11-12." ?

Thanks a lot for your answers

Marion

Hi everyone,

I have the same issue with an airport terminal and the base ratio for the parking calculations. Did anyone manage to resolve this with GBCI? 

Regards,

PP

Hi everyone, 

I have the same problem calculating the base ratio for a new airport. Did anyone manage to sort this out?

Hi Gustavo, 

Yes, I resolved this. We submitted a query to GBCI and they responded that The LEED v4 BD+C LTc Reduced parking footprint credit includes a table of base ratios for parking spaces, by building type in the table are listed the most common uses in the reference guide so that project teams do not have to use the ITE handbook directly this is called Table 1. However since airport projects are not listed in credit Table 1, you may utilize data from Tables 18-2 through 18-4 of the Institute of Transportation Engineers’ Transportation Planning Handbook (ITE) <https://www.usgbc.org/resources/institute-transportation-engineers-transportation-planning-handbook-3rd-edition-tables-18>.

Regards, 

PP

In Table 18-2 is data for the ITE Code: 021 Use: Commercial Airport. The project team can use the 85th percentile data for weekday which is .61 spaces per enplanement as the base line. (Utilization of the 85th percentile based on other codes, PCC Recommended Zoning Ordinance Provisions baseline rates use the 85th percentile data.)

The additional table from the ITE definitely seems useful for airports, but I still don't see Data Centers listed there. Has anyone had success with using 'Warehouses' to determine the Data Center thresholds required? I would think that's the most similar usage type, but wondered if anyone can confirm?

Thanks!

Chiming in here, because I have another use (professional athletic training facility) that isn't covered (it may be in 5th edition, I haven't bought it yet to be disappointed).  this is obviously an extremely rare typology, and I wouldn't expect it to be listed.  I'm guessing the appropriate approach would be to fine a similar use, if possible (regarding Rebecca's question on data centers, I would think warehouses would be a good proxy, but this is just an opinion).  for a professional athletic facility though, its harder to find a corollary - a public fitness gym obviously has a far wider set of users - I'm leaning towards "office" (our building will actually have more office users than athletes, even if a large portion of the SF - which the office parking ratio is based on - is not office but sports-related).  As I'm typing this, too, I'm thinking the most conservative approach would be just to base the parking ratio on the office SF in the project, though that may not be entirely fair.  anyone have thoughts, for this specific case, or the general case for unusual typologies?

Chris, I wonder if it would make sense to use the public fitness ratio for the fitness square footage, but adjust it based on your actual occupancy? Like bump the number down 10% because your equipment is more spaced out than a typical gym, or bump it up 20% because the athletes would all be there at one time instead of throughout the day...whatever your knowledge of this facility tells you about how it differs from a public gym. It's a little extra effort but could help you dial in a more accurate baseline.

Unless anything has changed recently the LEED guidance on this credit is just, do your best with what's in the table, so as long as the number makes sense to you and you can justify using it, you should be good! That logic applies to using warehouse baseline for a data center, too, and I'm pretty sure I've seen teams successfully use that before. 

It's very fuzzy guidance and I know no one in LEED world likes that, because your idea of common sense use of the ITE table might not line up with the reviewer's - the project team essentially has to say "this is my best guess" unlike many other credits which have hard numbers associated. The project team including a few bullet points explaining their choice of baseline will go a long way to showing they made that choice in good faith.

[My background here is that when I was a GBCI reviewer, I was assigned to answer technical questions about this credit and gave that "try to find the closest use and adjust as needed" guidance out a lot because there really isn't any better option. That was several years ago now, but the credit hasn't changed much and I haven't seen anything here or on my projects to contradict it. So, no secret ITE manual that GBCI will be reviewing you against!] 

***Since this thread started with airport projects I will say, there is some airport-specific resources and teams should reach out to USGBC for them, not just on this credit but overall. But for the rest of us with "weird" use types I'm not aware of anything beyond the combo of the ITE table and your best judgement. 

Thx Emily, very helpful advice, I particularly appreciate the ex-GBCI reviewer perspective.  I'll come up with our own blended ITE baseline (since this facility has a lot of auxiliary office functions, it will likely be most based on that, and with a factor for the athletes and their facilities - not sure yet if I'll scale this to office, or figure out how their occupancy and space relates to a public fitness facility).