To meet this prerequisite, you will need to assess the efficiency of your basic indoor plumbing fixtures, such as faucets, water closets, urinals, and showerheads, and determine how much potable waterPotable water meets or exceeds EPA's drinking water quality standards and is approved for human consumption by the state or local authorities having jurisdiction; it may be supplied from wells or municipal water systems. is consumed relative to a LEED baseline case. If your current bathroom, kitchen and janitorial closet fixtures are already highly efficient, you will probably meet the prerequisite. If your installed fixtures are older and exceed the baseline, you’ll need to modify them.
The baseline for the prerequisite is established by calculating how much water the project building fixtures would use, based on actual occupancy figures and usage patterns, if it were fully compliant with IPCInternational Plumbing Code/UPCUniform Plumbing Code 2006 plumbing codes displayed in Table 1. This baseline also takes into consideration the installation date of the relevant fixtures. For plumbing systems substantially completed before 1994, the baseline is set at 160% of the IPC/UPC-compliant figure; however, for systems substantially completed in 1994 or later, the baseline is set at 120% of the water usage with code-compliant fixtures. Buildings with a mixture of fixture installation dates will use a weighted average to determine the final baseline.
To determine compliance, you will need to inventory all installed fixtures, and document their flow and flush rates and date of installation. It is very important to determine the correct baseline setting, so carefully consider whether you have completed any major renovations to your bathrooms and associated plumbing systems in 1994 or later. If you have a pre-1994 building and have simply replaced bathroom fixtures without performing a more complete renovation of the bathroom structure and plumbing system, you’re allowed to use the 160% baseline for all of your fixtures.
Installing flow or flush restrictors, such as faucet aerators or dual-flushA type of water-saving toilet that gives a choice of flushes depending on the type of waste solid or liquid. flushometers, will carry relatively low costs. Expect significantly higher costs if you must replace the existing toilets to accommodate more efficient flushometers. Depending on water and sewer rates, plumbing retrofits like these can pay off relatively fast, however.
The key to successful documentation of this credit is proper setup of your building fixture groups in the LEED Online credit form. This part of the form can be confusing and is often misinterpreted. Carefully review the instructions on creating these fixture groups and make sure that the credit form is displaying the correct values for occupancy and number of fixtures in your building when you are finished. USGBC has provided a guide that helps clarify many common issues—be sure to review this (see Resources).
If you have a pre-1994 building, and are planning on performing a major bathroom renovation as part of the overall LEED project, be sure to register the project through LEED Online before starting any retrofitting in order to claim the less stringent 160% baseline.
You can try to find the manufacturer and model stamped on the fixture itself. Sometimes the fixture stamps are hard to find, are not legible, or even are not there. The other option is to physically measure and time water consumption rates for at least a 20% of the fixtures of each fixture type in the project building that differs from UPC/IPC requirements.
There is no official protocol for testing fixtures, but it can be done in the following ways. For a lavatory and kitchen sink faucets and showers, simply fill a bucket for 60 seconds. For wall-mounted urinals and water closets, ask the building engineerA qualified engineering professional with relevant and sufficient expertise who oversees and is responsible for the operation and maintenance of mechanical, electrical and plumbing systems in the project building. to assist you in disconnecting the plumbing from the flushometer and measure a flush of water into a bucket. It is recommended that each fixture be tested at least three times, to get a weighted average flow/flush rate. This is quite a process, so consider it a last resort if the fixture documentation can absolutely not be found. Make sure to track all of your testing data in a well-organized spreadsheet and to upload that data to LEED Online, along with a detailed narrative describing your testing methodology.
It is reasonable to count those fixtures as "plumbing renovation," so you could still list those fixtures as pre-1993. Per p. 85 of the Reference Guide, a flushometer change out is considered a minor retrofit, and doesn't trigger the more stringent baseline.
This prerequisite only includes core water uses—bathroom lavatories, water closets, urinals, showers, kitchen faucets and pre-rinse sprays. Janitors’ sinks, pot fillers, and tub faucets can be left out as they are used to fill containers with a fixed water volume regardless of the flow rate. "Kitchen sinks" includes all sinks in public or private buildings that are used with patterns and purposes similar to a sink in a residential kitchen. Break room sinks would be included; commercial kitchen sinks are not included. Lavatory faucets refer to hand-washing sinks, regardless of location, but lab or healthcare sinks with regulated flow rates are excluded. Pot-filling sinks can be excluded.
The following indoor plumbing fixtures and fittings are covered in all credit options: water closets, urinals, showerheads, and lavatory faucets.
Develop and implement a policy requiring an economic assessment of a conversion to high-performance plumbing fixtures and fittings as part of any future indoor plumbing renovation.
The assessment must account for potential cost savings on water supply, disposal, and expected maintenance. The economic assessment should, at minimum, determine the simple payback of any new fixture investment. Carefully consider the payback period required to justify your purchasing decision.
In-house staff may develop this policy and the ensuing economic assessment at minimal cost.
If your building has high-efficiency fixtures, consider using Option 4 (some or all fixtures installed before 1993) even if your building was completed or plumbing system renovated after 1993. This is an effective way to determine whether you’re eligible to earn additional points under WEc2.
Provide a copy of the official LEED scorecard confirming that the project building previously earned at least one point in water use reduction credits under another LEED rating system.
This compliance path carries no added cost.
Verify that the project building was initially built after January 1, 1993 and that the installed fixtures all meet the prevailing plumbing fixture efficiency standards in place at that time.
Project buildings built in 1993 or later will automatically earn additional points under WEc2 based on use of code-compliant fixtures and fittings.
This compliance path carries no added costs.
Verify that all relevant fixtures have been replaced since January 1, 1993 and that the installed fixtures all meet the prevailing plumbing fixture efficiency standards in place at the time they were installed.
Provide documentation that authenticates the date and scope of the fixture upgrade.
Formal authentication of the fixture upgrade can be met using copies of construction permits, substantial completion notices, contract excerpts, plumbing inspection reports, commissioning reports, or similar documentation.
If indoor plumbing systems were substantially completed at different times for different parts of the building, use Option 4 (see below) to complete performance calculations using a weighted average water-use baseline.
This compliance path carries minimal costs for documentation.
Inventory all plumbing fixtures to record manufacturer, model number, flush or flow rate and date of installation in project building.
Complete performance and baseline calculations in the LEED Online credit form using fixture data and occupancy and usage information. For plumbing systems substantially completed before 1993, the baseline is set at 160% of the IPC/UPC-compliant figure; however, for systems substantially completed in 1993 or later, the baseline is set at 120% of the water usage with code-compliant fixtures. If you have a pre-1993 building and have simply replaced bathroom fixtures without performing a more complete renovation of the bathroom structure and plumbing system, you’re allowed to use the 160% baseline for all of your fixtures.
If your building supports visitors or retail customers, you will need to calculate the average number of each of these occupant types that use your facilities on a daily basis.
The key to successful documentation of this credit is proper setup of your building fixture groups in the LEED Online credit form. This part of the form can be confusing and is often misinterpreted. Carefully review the instructions on creating these fixture groups and make sure that the credit form is displaying the correct values for occupancy and number of fixtures in your building when you are finished. For additional guidance on setting up these fixture usage groups, please reference guidelines published by USGBC (see Resources).
If performance calculations indicate that water use exceeds the baseline case, find opportunities for water-use reduction through replacement of fixtures and fittings with high-efficiency options.
If retrofitting is required, begin with low-cost fixtures and fittings, such as 0.5 gpm faucet aerators, high performance or dual-flush flushometers, and low-flow showerheads.
When replacing flushometers, make sure that the existing water closet or urinal bowl is capable of providing the flush rate specified on the new hardware. This information should be available on product data sheets or by request from the manufacturer.
If you have a pre-1993 building, and are planning on performing a major bathroom renovation as part of the overall LEED project, be sure to register the project with the USGBC before starting any retrofitting, in order to claim the less stringent 160% baseline case.
Replacement of traditional fixtures with high-performance alternatives may require higher upfront costs. However, these fixtures will conserve water as well as energy (from hot water), and will generally offer a favorable payback.
Provide manufacturer data verifying the flush/flow rate of all installed fixtures and fittings that either exceed or do not meet UPC/IPC specifications.
In buildings with older or diverse fixtures, it may be difficult to find product documentation of flow and flush rates. Identify fixtures by brand and model information, and contact manufacturers for assistance.
A good preventive maintenance program will not only identify leaks and obvious problems, but will also include a regular flow and flush rate test for at least 20% of fixtures to ensure continued performance.
If in-house staff perform preventative maintenance, costs will be minimal.
Excerpted from LEED 2009 for Existing Buildings: Operations & Maintenance
To reduce indoor fixture and fitting water use within buildings to reduce the burdens on potable waterPotable water meets or exceeds EPA's drinking water quality standards and is approved for human consumption by the state or local authorities having jurisdiction; it may be supplied from wells or municipal water systems. supply and wastewater systems.
Reduce potable waterPotable water meets or exceeds EPA's drinking water quality standards and is approved for human consumption by the state or local authorities having jurisdiction; it may be supplied from wells or municipal water systems. use of indoor plumbing fixtures and fittings to a level equal to or below the LEED 2009 for Existing Buildings: Operations & Maintenance baseline, calculated assuming 100% of the building’s indoor plumbing fixtures and fittings meet the plumbing code requirements as stated in the 2006 editions of the Uniform Plumbing Code (UPCUniform Plumbing Code) or International Plumbing Code (IPCInternational Plumbing Code) pertaining to fixture and fitting performance. Fixtures and fittings included in the calculations for this credit are water closets, urinals, showerheads, faucets, faucet replacement aerators and metering faucets.
The LEED 2009 for Existing Buildings: Operations & Maintenance water use baseline is set depending on the year of substantial completion of the building’s indoor plumbing system. Substantial completion is defined as either initial building construction or the last plumbing renovation of all or part of the building that included 100% retrofit of all plumbing fixtures and fittings as part of the renovation. Set the baseline as follows:
If indoor plumbing systems were substantially completed at different times (because the plumbing renovations occurred at different times in different parts of the building), Set a whole-building average baseline by prorating between the above limits. Prorate based on the proportion of plumbing fixtures installed during the plumbing renovations in each date period, as explained in the LEED Reference Guide for Green Building Operations & Maintenance, 2009 Edition. Pre-1994 buildings that have had only minor fixture retrofits (e.g., aerators, showerheads, flushing valves) but no plumbing renovations in or after 1994 may use the 160% baseline for the whole building.
Demonstrate fixture and fitting performance through calculations to compare the water use of the as installed fixtures and fittings with the use of UPC- or IPC-compliant fixtures and fittings, as explained in the LEED Reference Guide for Green Building Operations & Maintenance, 2009 Edition.
Develop and implement a policy requiring economic assessment of conversion to high-performance plumbing fixtures and fittings as part of any future indoor plumbing renovation. The assessment must account for potential water supply and disposal cost savings and maintenance cost savings.
Reduce indoor plumbing fixture and fitting potable waterPotable water meets or exceeds EPA's drinking water quality standards and is approved for human consumption by the state or local authorities having jurisdiction; it may be supplied from wells or municipal water systems. usage through automatic water control systems. Install, where possible, water-conserving indoor plumbing fixtures and fittings that meet or exceed the UPCUniform Plumbing Code 2006 or IPCInternational Plumbing Code 2006 fixture and fitting requirements in combination with high-efficiency or dry fixture and control technologies.
The Uniform Plumbing Code defines water-conserving fixtures and fittings for water closets, urinals and metered faucets. This ANSI-accredited code safeguards life, health, property and public welfare by regulating and controlling the design, construction, installation, quality of materials, location, operation and maintenance or use of plumbing systems.
The International Plumbing Code defines maximum flow rates and consumption for plumbing fixtures and fittings, including private lavatories, public lavatories (metering and those other than metering), showerheads, sink faucets, urinals and water closets.
This document from USGBC offers guidelines to help you properly set up fixture usage groups in the LEED Online credit form, avoiding common mistakes associated with the water-efficiency prerequisite and credit.
WaterSense, a partnership program sponsored by EPA, certifies products that meet its water conservation thresholds.
Includes information on practices for conserving water and using water efficiently for residential users, system operators, agricultural users, and for industrial/commercial users. Both engineering and behavioral practices are described.
This portion of RMI’s website is devoted to water conservation and efficiency. The site contains information on commercial, industrial and institutional water use, watershed management and articles on policy and implementation.
This Web site offers a plumber’s perspective on many of the major low flow water efficient toilets used in commercial and residential applications.
This site provides two reports on independent test results for flush performance and reliability for a variety of different toilets.
This site provides good information on basic water efficiency challenges, best practices and federal, state, and local resources.
WATERGY is a spreadsheet model that uses water/energy relationship assumptions to analyze the potential of water savings and associated energy savings.
The Alliance for Water Efficiency provides information and assistance on water conservation efforts.
This article from Environmental Building News discusses building water efficiency.
All options require documenting a policy that mandates economic assessment of conversion to high-performance plumbing fixtures and fittings as part of any future indoor plumbing renovations.
Provide and highlight, as in this example, manufacturer data that are not UPCUniform Plumbing Code/IPCInternational Plumbing Code code-compliant.
A plumbing fixture inventory needs to include manufacturer, model number, flush or flow rate and date of installation in project building.
Your LEED-EBOMEBOM is an acronym for Existing Buildings: Operations & Maintenance, one of the LEED 2009 rating sytems. plans must include all required elements of the Program & Plan Model, which is described in this USGBC document.
The following links take you to the public, informational versions of the dynamic LEED Online forms for each EBOMEBOM is an acronym for Existing Buildings: Operations & Maintenance, one of the LEED 2009 rating sytems.-2009 WE credit. You'll need to fill out the live versions of these forms on LEED Online for each credit you hope to earn.
Version 4 forms (newest):
Version 3 forms:
These links are posted by LEEDuser with USGBC's permission. USGBC has certain usage restrictions on these forms; for more information, visit LEED Online and click "Sample Forms Download."
This LEED Online form with annotation demonstrates how to document WEp1 and WEc2.
Our store is located in a shopping mall where customers have no access to WCs in the shop, but use the WCs provided within the main shopping mall. Do we need to include these shared WCs for the LEED assessment when calculating transient water use?
Having worked on a LEED EBOMEBOM is an acronym for Existing Buildings: Operations & Maintenance, one of the LEED 2009 rating sytems. project in Helsinki, Finland, where we were unfortunately not able to fulfill one of the prerequisites (EAp2), motivated me to dedicate my bachelor's thesis to this particular topic. It is my intention now to create a "guidebook" on how to successfully implement those prerequisites, which are the most challenging in projects outside the US.
Is there anyone who would be willing to share his/her experiences with me over Skype or telephone interview? I am particularly interested in experiences regarding the implementation of prerequisites in projects outside the US.
I would very much appreciate any help and I will of course share my findings with you, too!
I have a building that was built before 1993 with airators that are 2.2. Inorder to meet the prequisite I have to change the Airators to .5. Can I just go ahead and change them out and then submit for approval. Or do I have to report as is, make a plan to conform, and then change them?
You can change out the aerators and complete the credit form using the 0.5 gpm flow rate.
I am trying to put together a water fixture inventory and calculations for an office complex that has three buildings built in different years that are attached as one building. The first building was built before 1994. The second building was built in 1998 and the third building was built in 2007. when filling out the fixture inventory do I seperate each building and do the calculations? And in the end put all three buildings calculations together. Or do I list each buildings fixtures and do a weighted flush rate. and then do the calculations off the weighted flush rates?
Count each as a separate fixture group. That will allow you to associate the occupants and transients in each building with the fixtures that they use.
We're trying to certify a building on our campus that contains the student health center. Each of the exam rooms has a sink in it for the doctor to wash hands before/after the exam. Do we need to include these in our calculations? Please advise.
I'd say that now that LEED HC is live and you are in LEED v3 that you can exclude them. Exam sinks are 'process waterProcess water is used for industrial processes and building systems such as cooling towers, boilers, and chillers. It can also refer to water used in operational processes, such as dishwashing, clothes washing, and ice making.' in LEED HC and you want to maintain a decent flow rate. Explain this in a narrative.
I have two questions about the LEED Online WEp1 form:
1. Table 3a on page 87 of the Reference Guide (updated 4/2010) shows a default lavatory faucet duration of 15 seconds, but Table WEp1-4 on the LEED Online form gives a default duration of 30 seconds. Can someone please confirm that the correct duration to use for non-metered lavs. is 30 seconds?
2. The LEED Online form gives the option (at the very top) to select "All relevant fixtures and fittings installed or replaced after January 1, 1994". If I select that, what happens? The Performance Calculation template does not appear, so where would I perform the calculations to earn WEc2 points (since typically the calc's are done on the WEp1 form and linked to WEc2)?
I appreciate your help.
1. The Addendum change the default duration to 30 seconds. I've been through the question on a previous CI project and found the answer. That said, I submitted with 15 seconds and the review team accepted.
2. You have to choose the Performance Calculation to get points in WEc2. The other two options are sufficient to meet the prerequisite but not to get points.
Thank you for your timely and thorough response. I apologize for not first checking the LEED Interpretations/Addenda database.
It's never easy to get the full answer, with the regular addenda and a constant stream of CIRCredit Interpretation Ruling. Used by design team members experiencing difficulties in the application of a LEED prerequisite or credit to a project. Typically, difficulties arise when specific issues are not directly addressed by LEED information/guide. One of the benefits of LeedUser is being able to ask questions like this. I do it all the time.
If our potential project is currently installing flush & flow fixtures, but wants to start the performance period, is it acceptable to enter the new flush & flow rates as long as they are all installed by the completion of the performance period or will they have to delay the performance period until installation is entirely completed?
In one of those strange twists to the LEED rating system, neither WEp1 nor WEc2 have a performance period. That means that as long as the fixtures are performing as promised on the date of submission you should be ok.
Dishwashers should not be included in the form correct? Since in the preliminary review, we were asked to include kitchen sinks in the calculations, but we only have two dishwashers in the project building (a mixed-use office building).
Thank you in advance.
No, dishwashers should not be included. This prerequisite is only looking at indoor plumbing fixtures and fittings.
If you have no kitchen sinks, just include a note to the reviewers that there are none and you should be good!
Alicia and Hannah, there is a LEED CIRCredit Interpretation Ruling. Used by design team members experiencing difficulties in the application of a LEED prerequisite or credit to a project. Typically, difficulties arise when specific issues are not directly addressed by LEED information/guide that states that kitchen sinks should not be included. Alicia, you were asked to include them? CIR text below...
"For hospitality projects, commercial kitchen sinks and bar sinks including pot sinks, prep sinks, wash down, and cleaning sinks are considered process waterProcess water is used for industrial processes and building systems such as cooling towers, boilers, and chillers. It can also refer to water used in operational processes, such as dishwashing, clothes washing, and ice making. and are not included in the water use calculations. Hand washing sinks located in commercial kitchen areas that do not pass through a grease interceptor should be included in the water use calculations under the kitchen sink category."
Thanks for the responses. We were asked to include kitchen sinks; since our project building is a 55 floors mixed-used office building and contains two kitchens they found unusual that no sinks were included in the form.
In the Review Response we will add a narrative stating that two dishwashers are in the kitchen areas, and we will add the hand washing sinks located in the kitchen as kitchen sink category. Thanks a lot!
We can use some guidance on revising our submittal template to meet the reviewers clarification request. Under the Reduced Occupancy Guidance for LEED the reviewer is asking that we adjust our submittal to be inline with ASHRAE standard 62.1 defult values for a floor in the building that is unoccupied. Then to account for this as a usage group distributing the default occupants reasonably to the variuos fixture types. The floor is completly vacant and has not been built out yet. Thank you in advance for your replies.
Bruce, can you anticipate what the usage of the floor is likely to be, and use that?
Thank you for your suggestion. I have since learned that the default value for office space used in the ASHRAE 62.1 audit is 5 people per 1000 sq. ft.
I just want to understand at what pressure is flow rate of kitchen sink (2.2 GPM) defined
Rumi, it doesn't appear that the LEED-EBOMEBOM is an acronym for Existing Buildings: Operations & Maintenance, one of the LEED 2009 rating sytems. reference guide offers a specific definition for this, in psi.
We have a fitness center in our building and I'm looking for guidance on how to model water use in the facility. It appears obvious to model the facility as a separate fixture group as it has an identifiable set of users which are different (although overlapping) with the building FTEFull-time equivalent (FTE) represents a regular building occupant who spends 8 hours a day (40 hours a week) in the project building. Part-time or overtime occupants have FTE values based on their hours per day divided by 8 (or hours per week divided by 40). Transient Occupants can be reported as either daily totals or as part of the FTE. Residential occupancy should be estimated based on the number and size of units. Core and Shell projects should refer to the default occupancy table in the Reference Guide appendix. All occupant assumptions must be consistent across all credits in all categories.. If a building FTE does use the center he will be tracked there as a transient.
While the data related to toilet use may be close to accurate for the center FTEs and visitors (in the lack of any other data,) the shower use pattern is obviously wrong as a very high percentage of the transients will use the showers.
Has anyone dealt with this before and how did you handle it?
We had a very similar situation at a project recently Michael, and it sounds like you have it well in hand. We adjusted the assumptions around fitness center users (transients) to reflect that they all used the toilet one time and that a high percentage (I think we used 80%) also used the shower. We derived those assumptions from conversations with the center staff and custodians. The LEEDOnline form can accomodate those changes readily. I would also recommend clearly explaining your assumptions about use patterns in your submittal - walk the reviewer through your logic about how fitness center users behave and your basis for those assumptions.
Hope that helps,
Thanks for the quick response Dan. I figured that would be the approach but it's good to have some confirmation. I've learned the value of explaining anything out of the ordinary to the reviewer!
I'm looking for the actual formula/equations used for the calculations that are done automatically on the WEp1 active form. I thought I could work through it logically, but my numbers are not matching what's being returned on the form when I enter the data. Does anyone know where I can find the actual formulas used behind the scenes in these tables? Any help would be greatly appreciated!!
You should carefully document the logic you used to obtain the fixture uses you used in your data. Upload this in a file along with your other plumbing data. Uncheck the "default" box where you used your own calculation.
In each bathroom of our project building there are 5 blow-out fixtures and 1 standard water closet that is handicapped accessible. The two types of fixtures have different flush rates. In my submittal, I included both fixtures under the same fixture family and fixture group and then altered their usage rates to be proportional to the amount of each fixture. In other words, I had the blow-out fixtures being used 5 times more than the standard water closet. My LEED reviewer has said that in order for the calculator to perform correctly, there can only be one fixture from each fixture family to each fixture usage group. It sounds like they want me to figure out a how big the subset of the building population is that uses the handicapped accessible toilets, but I’m not sure how feasible getting that number is. Would another acceptable solution be to use the average of all fixture flush rates? Any other thoughts or comments would be greatly appreciated.
I think the issue is that you assumed the handicapped (HC) fixture would only be used by the HC population, which is often untrue. The calculator will do the math for you, so don't manipulate any of the usage rates. Just list each type of fixture within the fixture family, it's associated flush rate, and let the calculator do it's thing. I would not average the flush rates. I have been seeing this method rejected more and more frequently.
If you include blow-out fixtures and conventional WCs in one fixture group the water calculator will double count (it will apply the entire occupancy to both kinds of fixtures). The fixture group is intended to identify the occupants who will be using a particular type of fixture, so you need to designate the number of FTEs and transients who will be using the HC WCs. I agree with EBI that this number does not have to be the actual number of handicapped occupants, as non-handicapped occupants will also use the fixtures (unless access is restricted). So set up two fixture groups and split the FTEs and transients between them, perhaps on the basis of proximate floor area. Explain in a narrative so the review team can understand your rationale.
Blow-out fixtures begs a different question: why are you using them? Are you certain that the WCs are blow-out fixtures and not conventional WCs?
our review just came back and the reviewers made the following comment:
"The economic assessment policy is incomplete, as it does not require that maintenance cost savings be included in the economic assessment.
Technical Advice: Please provide a revised policy that accounts for potential water supply and disposal cost savings, as well as maintenance cost savings as part of the required economic assessment of conversion to high-performance plumbing fixtures and fittings."
1. 'potential water supply and disposal cost savings' surely means 'water utility savings and sewage utility savings', which is included in the policy we submitted - or am i missing something?
2. we had submitted the policy document with an amendment which specifically amended the policy to include "potential maintenance cost savings". again: i don't understand what else we should include?
before i send a clarification request to the review team, maybe one of you can help me shed some light on this?
Jutta, if you used the copy of the policy that is currently available in the Documentation Toolkit, then I'm not sure why the reviewer would have marked it pending. Section 6 of the draft policy clearly indicates that the economic assessment will consider:
3. Water utility savings
4. Sewage utility savings
5. Potential Maintenance Costs
Beyond spelling it out that way, I don't think there's much else you can do. I'd go ahead and send the clarification request to see if you can get any other details.
Jason, thank you. since the "potential maintenance cost savings" were included in a policy addendum, it seems to me that they may have overlooked this part of our documentation and will raise this and the other query with them.
We are working on a large building pursuing EBOMEBOM is an acronym for Existing Buildings: Operations & Maintenance, one of the LEED 2009 rating sytems. certification. The proposed retrofit urinal flush valves and new toilet flush valves have an adjustable flush valve which would be set at a low flow level during the performance period.
It seems that all calculations would be done at the installed rate, but the valves allow the building owner/maintenance staff to adjust to a higher flow at a later date. How does USGBC view this?
Are you talking about existing toilets with screws that regulate flush?
In that case, I would recommend to perform a water audit for 20% of the fixtures and make sure these are all adjusted to product specs.
Chris, it sound like you're also hinting at the fact that the building owner could potentially game their WEp1 performance by using the most efficient flush rates that the valves can provide in the prerequisite calculations and then go back after the fact and reset the flush valves to use more water than initially reported. I'm not sure why the building owner might want to do this, unless a) they don't pay for water or pay very little for water (which is common) and/or b) they have occupant or maintenance compliants about the performance of low-flow, high-efficiency fixtures.
To answer your question, GBCI reviewers will take your submitted documentation at face value, as long as you can provide cut sheets that verify the technical data used in your calculations. However, the whole LEED EBOMEBOM is an acronym for Existing Buildings: Operations & Maintenance, one of the LEED 2009 rating sytems. system depends on the customer providing accurate certification documentation in good faith to GBCI. If this is just something you're curious about, these are my thoughts and feel free to do with them what you will. If the building owner has actually approached you with this question/plan, I'd suggest having a discussion with them about the basic environmental intent of this prerequisite and chat a bit about water scarcity issues that are becoming more and more relevant (and damaging) all over the world. Hope this helps.
We are currently dealing with a hotel project that has saunas installed. Does anyone know if the showers at the sauna can be excluded from the water use calculation?
Our idea would be to exlude them either by declaring that the showers are exceptional water user (like process waterProcess water is used for industrial processes and building systems such as cooling towers, boilers, and chillers. It can also refer to water used in operational processes, such as dishwashing, clothes washing, and ice making.) or by claiming that the FTEs have been already included in the room usage pattern.
Has anyone experience with such a issues?
Julia, I'm not sure why you want to exclude the showers? We know they are going to be used by some guests—why not capture that use and seek to reduce it?
We are about to perform the inventory of water flow of the fittings and fixtures in a manufacturing plant. Any recommendations about metering equipment and instruments? Is it possible to install a bypass with a meter on each restroom circuit and then test each fluxometer?
It's up to you to figure out how you'd like to test the flow and flush rates, but the way that I've seen it done in the past is much more low-tech than you're describing. We've simply disconnected the flushometers and used a bucket to catch the water from each flush. For sinks, we'll run the water for 15 seconds and then measure how much is collected and multiple by 2 to get the amount dispensed in 30 seconds.
In an ideal exercise, each fixture should be tested 3 times, the results recorded and then averaged to get the average flow/flush rate per fixture. The results for an entire fixture family (i.e. urinals) may then be aggregated to get the average flow/flush rate for the entire facility.
At least 20% of the number of fixtures in each fixture family should be tested and, to account for varying water pressure in upper floors of the facility, you should start your testing on the ground floor and work your way up.
Could anyone shed some light as to how they might approach this PR with a hospital. There international restrictions on the use of aerators on facets, sinks etc because of pathogens.
Email me at firstname.lastname@example.org.
I can help you with the challenges in Healthcare.
Ed Brady, CEM, LEED GA
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 UPCUniform Plumbing Code/IPCInternational Plumbing Code)." Can someone explain that to me in english as to what that means?
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 UPCUniform Plumbing Code/IPCInternational Plumbing Code 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.
Please help me figure this out...
We're working with a building built in the 80's, all original plumbing and fixtures. They registered with LEED, then performed a complete renovation (plumbing, porcelain, the works). So when I fill out the on-line form, in the Fixture Groups Definition table, do I list the fixtures as replaced pre-1994, or because they were all renovated in 2011, do I list them as replaced after-1994?
Of course, I want to hold the pre-1994 baseline of 160%!
Refer to Jason's comments below.
Thank you, Brittany. All fixtures were replaced. So this statement from LEEDUser text, above, Is incorrect?:
"If you have a pre-1994 building, and are planning on performing a major bathroom renovation as part of the overall LEED project, be sure to register the project through LEED Online before starting any retrofitting in order to claim the less stringent 160% baseline."
If the renovations were performed for the purpose of meeting the LEED requirements, and were completed after the project was registered with USGBC, you can still claim the 160% baseline typically associated with pre-1994 fixtures. This is one of the nice little secrets that is not prominently published by USGBC, but is allowed to project teams.
That's what I thought, Jason. But how do I document this on the form? You are asked to list the number of pre- and post-1994 fixtures. Do I list the new, efficient fixtures as pre-1994?
Yep, list them as pre-1994 when you are building your fixture usage groups and feel free to include a narrative to explain the circumstances so that the reviewer understands why pre-1994 fixtures are being claimed with much better flush/flow rates that would normally be expected.
One comment to keep in mind for the future: I would assume that when you come to recertification in 5 years, the fixtures will be considered post-1994. That would mean that any WEc2 points you are getting from the increased baseline will no longer be available, so you could potentially see a loss of points under WEc2, despite having the same fixture stats.
(Can Jason or someone else confirm if I am understanding this correctly?)
Yes, that's true. You are only allowed to count a renovation like this as "necessary to meet the LEED requirements" once in the total LEED lifecycle of a building. When the building gets recertified under either LEED 2012 or "LEED 2015" (or whatever that future version is called), you would need to group these renovated fixtures into the newer category, so the relative reduction from the LEED baseline will be lower in the future.
1. If the renovations were performed before the project was registered, then all renovated plumbing fixtures will be listed as post-1994? And all fixtures that were not renovated but meets the UPCUniform Plumbing Code/IPCInternational Plumbing Code Standard will be listed as pre-1994?
2. If some renovations (water closet replacement) were performed for the purpose of meeting the LEED requirements, and were completed before the project was registered with USGBC (our situation above), then the baseline 120% or 160%?
I am currently engage with a LEED EB O&M project located in the UK. As part of the WEp 1 requirement we are asked to upload authentictaion document with reference to the date and scope of plulmbing fixtures upgrade for all fixtures and fittings installed or replaced after January 1994. The owner of this building has no documnentation for the upgrade of the plumbing fixtures. Would it be acceptable if the commissioning authority or the Maintenacne company which oversees the maintenance of the builiding provides a letter based on the visual inspection of the plumging fixture types and models. Please advise.
Fareed, this sounds like a reasonable approach to me, although I can't say for sure.
Fareed, You don't have to worry to much about proving the date of installation, especially for fixtures installed after 1994, because those fixtures are held to the more stringent baseline.
The main thing is, for any fixture that has flush/flow rates different from UPCUniform Plumbing Code/IPCInternational Plumbing Code standards, you must provide verification of what the actual flow rate is.
Does anyone have an excel template that they created to calculate the baseline vs. installed case? I've been working on it, but it is complicated. Email: email@example.com if so. Thanks!
Emily, the easiest way to accomplish this is to use the actual WEp1 Credit Form from LEED Online. If you don't have a registered project yet, you can download a sample WEp1 form from LEED Online as well.
Once you have the form, you can enter your Fixture Usage Group data (occupancy, fixtures installed pre/post 1993, etc.) and the information for the Baseline fixture case. After that, you can play around with the Installed case by entering different flow and flush rates to see how different retrofitting initiatives will play out at your facility and track the results of each scenario separately.
This is really the best way to do it because you're taking advantage of the USGBC-published calculation methodology within their own form. When you use a custom excel calculator, there's always a chance that your formulas will differ somehow. This way, you can be confident that the results are accurate.
Thanks. I find the online form to be even more complicated and obtuse than what I'm trying to build to aid our facilities staff in taking an inventory, but I suppose it still may be the best bet.
If you're talking about the fixture inventory itself -- rather than the calculation of the baseline vs. installed cases -- then there is a template available through the 'Documentation Toolkit' tab for this credit (on this site).
Is it possible to show compliance with this prerequisite by reducing potable waterPotable water meets or exceeds EPA's drinking water quality standards and is approved for human consumption by the state or local authorities having jurisdiction; it may be supplied from wells or municipal water systems. use by harvesting and reusing rainwater for flushing?
Absolutely Udana. I don't believe the LEEDOnline template for WEp1 is currently set up to accomodate this calculation, but in principle the credit is about the amount of potable waterPotable water meets or exceeds EPA's drinking water quality standards and is approved for human consumption by the state or local authorities having jurisdiction; it may be supplied from wells or municipal water systems. used for fixture functions - using non-potable water to replace potable water is a step in the right direction. My thinking is that you would complete the fixture calculations in the normal methodology, then supplement your calculations with an additional submittal detailing the annual graywaterGraywater is untreated household waste water which has not come into contact with toilet waste. Graywater typically includes used water from bathtubs, showers, bathroom wash basins, and water from clothes-washer and laundry tubs, though definitions may vary. Some states and local authorities also allow kitchen sink wastewater to be included in graywater. Project teams should comply with the graywater definition established by the authority having jurisdiction in the project area. collection volume (based on metering?) and the % reduction from the baseline resulting when that volume is subtracted from your WEp1 calculation. Alternately, if graywater provides 100% of your flushing water for toilets/urinals year-round, you could input those fixtures as 0 gal/flush and get the same result.
Thanks Dan. was thinking the same. :)
Had anyone successfully used as-built drawings to verify the installation date of water fixtures? On this page, the Checklist states that,
"Formal authentication of the fixture upgrade can be met using copies of construction permits, substantial completion notices, contract excerpts, plumbing inspection reports, commissioning reports, or similar documentation."
As-built drawings are not specifically listed here, but it seems like they would actually be one of the most reliable forms of authentication.
As long as the as-built drawing is dated after January 1, 1993, that seems like it should be an acceptable piece of documentation to verify that the prerequisite requirements are met.
Thanks for the reply Jason.
Another question: Is the cut-off Jan.1, 1993 or Jan. 1, 1994? The reference guide uses language such as "completed in 1993 or later" and "completed before 1993" implying that the important date is Jan. 1, 1993. However, on this site the language reads "in 1994 or later" and "pre-1994" implying that Jan. 1, 1994 is the cut-off. Which is correct?
David, the Reference Guide as published in 2009 has been updated by LEED addenda reflected in our language above. So it's the 1994 date.
To add to Tristan's comment, your project only needs to adhere to the addendas which were dated prior to your registration date. You can search for this specific change on the USGBC site, here. Depending on when your project was registered it would be either 1993 or 1994.
I understand the different occupancy types and the default fixture use values; however, what I do not understand is how I am suppose to get a somewhat accurate estimation of a occupancy daily total for a classroom and office building. Especially if It is such a high traffic building with many entrances and exits.
Ackerstein Sustainability, LLC
WEp1 establishes the baseline to demonstrate reduced potable water usage for WEc2.
Rainwater harvesting can contribute to WEp1 while reducing runoff for SSc6.
Landscape irrigation with graywater or rainwater goes hand-in-hand with use of those sources in nonpotable plumbing applications.
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