Dear All:-
Our project is use 100 % recycled water for irrigation (ETP Treated water) and so it is option 2 - path 1 and we have met the
option 1 50% water reduction by use of recycle water but the reviewer ask 50 % saving from Mid summer base case irrigation
as per the LEED BD + C reference guide page number 179 we may use recycled water to claim either option 1 50% reduction or option 2 100 % reduction so now we have some doubts from the review
1.we have used the 100 non potable water so in this case ,is it mandatory to save the irrigation water by 50% from midsummer baseline
2.How we overcome the review the following is the review comments
" The additional documentation indicates that the landscaping and irrigation systems have been designed to reduce potable water consumption for irrigation by 100% and the total water used for irrigation by 27.97%. However, the documentation continues to indicate that "total water consumption" has been reduced by 27.97%, whereas a minimum reduction of 50% must be achieved. Note that, as indicated within the LEED BD+C v2009 Reference Guide, projects attempting Option 2: No potable water use or irrigation must also meet all requirements of Option 1: Reduce by 50%. Therefore, although a 100% reduction in potable water usage has been documented, a 50% reduction in total water usage is required as well. The documentation does not demonstrate compliance."
3.In this review comments they mention that "total water consumption" what it means either total water consumption such as flush, flow fixture, Irrigation or just only irrigation
4.Kindly inform is there any alternate compliance path or CIR available to get 4 points for 100% non potable water usage project
Please clarify the above issues and help us to overcome this situation
Michael Smithing
Director - Green Building AdvisoryColliers International Ltd.
304 thumbs up
December 5, 2018 - 11:45 am
To get the 100% water reduction option, you need to meet both of the following requirements:
1. Install water efficient landscaping that reduces the total irrigation demand for the project by a minimum of 50% from the baseline. (It appears that you are documenting only a 27.97% reduction and have not met this requirement.)
2. Use no potable water for irrigation (this is often met with greywater, but could also be met by using plants which do not require water - or locating your project in a very humid location.)
I haven't found a way around the efficiency requirement - particularly after you've submitted the documentation for the preliminary review. As the baseline is based on typical market practices, there is some flexibility in the baseline for the 50% reduction calculation. While I don't know the project and location, a change of 20+% in the baseline should be challenged by review team.
SAMY Chamy
EnginneerT&T Green
12 thumbs up
December 5, 2018 - 11:05 pm
We have gone through the LEED 2009 reference guide and all the credit interpretations. The requirement of 50% total water use reduction is not mentioned any where. Let me quote the reference guide "Reduce potable water consumption for irrigation by 50%" It is not mentioned as total water. Can we challenge the reviewer with their reference guide text? No where in the form also the total water is mentioned or calculated. In the irrigation calculator in WEC1 form also as soon as we enter all the irrigation design water as non potable water it shows as 100% water is reduced.
Else Kindly indicate where the 50% reduction in total water condition is given.
Carlie Bullock-Jones
PrincipalEcoworks Studio
LEEDuser Expert
220 thumbs up
December 6, 2018 - 8:11 am
This requirement is noted on the first page of WEc1: Water Efficient Landscaping within the Reference Guide. Under Option 2 (No Potable Water Use or Irrigation) it first states "Meet the requirements for Option 1 (Reduce by 50%)" AND then either meet Path 1 (captured rainwater, etc.) or Path 2 (no irrigation).
The general intent of this credit is to encourage water efficient or xeriscape landscaping practices, which require little to no irrigation. If, after such practices are implemented, irrigation is still necessary to maintain the landscape, then project teams can follow two paths for credit compliance.
Michael Wahjudi
Sustainable Consultant3 thumbs up
January 16, 2019 - 9:02 pm
Hi we are facing the similar issue as well. Our project is using 100% nonpotable water and rejected due to non-compliance to Option 1. However the reference guide for option 1 do indicate that
Option 1. Reduce by 50% - 2 points
Reduce potable water consumption for irrigation by 50% from a calculated midsummer baseline case.
Reductions must be attributed to any combination of the following items:
* Plant species, density and microclimate factor
* Irrigation efficiency
* Use of captured rainwater
* Use of recycled wastewater
* Use of water treated and conveyed by a public agency specifically for nonpotable uses.
As stipulated above, the second paragraph already listed that the use of captured rainwater can attribute to reduction. Why these statements are contradict for option 1 compliance?
Cheers
Debra a. Lombard
Construction Administrator/ LEED APBywater Woodworks, Inc.
46 thumbs up
June 7, 2019 - 12:37 pm