Please excuse my ignorance on this, but when determining the baseline to compare, I understand that it depends on the substantial completion date of the plumbing system and if before 1993, then use 160% and if after, use 120%. So if my building was designed and built in 2000, then I use 120%. Problem is, what does that mean? Where do I use 120%. What is that used as my mutiplier against what? Guide book says "of the water use that would result if all fixtures met the codes cited (in UPC/IPC)." Can someone explain that to me in english as to what that means?
You rely on LEEDuser. Can we rely on you?
LEEDuser is supported by our premium members, not by advertisers.
Go premium for
Jason Franken
Sustainability ProfessionalLEEDuser Expert
608 thumbs up
April 13, 2012 - 4:24 pm
The good news is that you don't have to do any actual math here. The WEp1 credit form in LEED Online does all the work for you. Once you enter all of the fixtures in your building, along with corresponding flush and flow rates, the form will calculate the following:
1) the amount of water your installed fixtures use on an annual basis,
2) the amount of water that would be used if all of your fixtures flush/flow rates exactly matched UPC/IPC 2006 standards (this is the number that then gets multipled by 120% or 160% depending on the year of substantial completion), and
3) the difference between the baseline case and the installed case, represented as the percent reduction from the LEED baseline case.
There's a lot of information in this LEED User page explaining how to get your building's fixture inventory data into the WEp1 credit form properly. Once that's taken care of, the form does the rest.