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WAT-1 OCCUPANT AMENITY WATER

Technical Clarification

WAT-01 Occupant Amenity Water: Exclusion of external taps and designated Cleaner room taps

Technical Clarification Number
WAT-1-T-OFF1-1560

Guidance
2016-09-09

Note that external taps and specific taps for cleaners only (not for occupant usage) can be excluded from the Potable Water Calculator in terms of the WAT-01 Occupant Amenity Water credit.

The aim of the Wat-1 credit is to encourage and recognise designs that reduce potable water consumption by building occupants. As such, the intent is to minimise potable water consumption in occupant amenity fixtures and fittings (toilets, all internal taps, urinals and showers) through the use of efficient fixtures and fittings, reused / harvested water or a combination of these initiatives.

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Technical Clarification

Off-site reclaimed water - entered into the Potable Water Calculator

Technical Clarification Number
WAT01-T-OB1-1017

Guidance
2015-08-06

Reticulated off-site reclaimed water, as per CIR WAT1-C-OB1-0266, should be represented in the Potable Water Calculator either as:

 

  • Greywater (entered under ‘Other greywater Collection Sources’ under the greywater section of the calculator) depending on the quality of the water received by the site (quality of water would be either greywater or already treated black water that is not treated to a potable level), or
  • Blackwater (entered under ‘Other blackwater Collection Sources’ under the blackwater section of the calculator) depending on the quality of the water received by the site (quality of water would be untreated blackwater i.e. raw sewage – this is often called sewer mining).

 

Technical Clarification

WAT-01 Occupant Amenity Water: Exclusion of external taps

Technical Clarification Number
WAT01-T-OB1-438

Guidance
2012-03-19

Superceded by WAT-1-T-OFF1-1560

 

Credit Interpretation Request

Statement of confirmation - manufacturer

Credit Interpretation Request Number
WAT1-C-OB1-0321

Ruling
2012-01-16

The Credit Interpretation Request (CIR) seeking approval for the use of a letter from the manufacturer confirming fixture flow/flush rates where product datasheets do not confirm these flow/flush rates is approved.

 

Erratum

Green Star SA - Office v1 Technical Manual: Page 193

Erratum Number
WAT1-E-OB1-0280

Guidance
2011-08-08

Documentation Requirements, documentation table, Design and As Built sections, delete the bullet points which read "Evidence of approval from the relevant authority".

 

Erratum

Green Star SA - Office v1 Technical Manual: Page 194

Erratum Number
WAT1-E-OB1-0281

Guidance
2011-08-08

Documentation Requirements, description of documents, delete the paragraph headed "Evidence of approval from the relevant authority…"

 

Erratum

Green Star SA - Office v1 Technical Manual: Page 195

Erratum Number
WAT1-E-OB1-0282

Guidance
2011-08-08

Additional Guidance, delete the paragraph headed "Relevant authority approval…"

 

Technical Clarification

Evidence of approval from the local authority

Technical Clarification Number
WAT1-T-OB1-0279

Guidance
2011-06-09

Where rainwater collection or water reuse systems are installed, project teams are no longer required to provide 'evidence of approval from the relevant authority' within their documentation submitted for a Green Star SA Design / As Built rating.

Whilst this documentation is no longer required to be included wihin the submission for Green Star SA certification, the GBCSA would expect that project teams adhere to all relevant authority regulations and requirements (including approval of such systems where required).

 

Credit Interpretation Request

Off-site reclaimed water - alternative documentation can be provided as per 29 April 2014 see *

Credit Interpretation Request Number
WAT1-C-OB1-0266

Ruling
2011-06-09

The use of reticulated off-site reclaimed water is an acceptable way to reduce potable water consumption within the Green Star SA rating system. Although off-site harvesting and recycling systems are not specific attributes of the building seeking Green Star SA certification (as would be the case of an on-site water harvesting and recycling system), the fact that the building has chosen to incorporate the necessary infrastructure to connect their building services to the off-site service is, in this scenario, viewed as a building attribute.

The following additional documentation requirements apply where reticulated off-site reclaimed water is used:

For Green Star SA Design ratings;

• Evidence that the reclaimed water system is operational at the time of practical completion of the building.

• Confirmation from the off-site non-potable water supply vendor that the required supply is available to the project.

For Green Star SA As Built ratings;

• Evidence that the reclaimed water system is operational at the time of practical completion of the building.

• An extract from the contract between the off-site non-potable water supply vendor and the building owner must be provided.

* 29 April 2014 TC788
The project team’s proposal for providing alternative evidence to that requested in the WAT1/3/4-C-OB1-0266 CIR’s (evidence that reclaimed water system is operational and confirmation of supply from water vendor) is hereby approved.

We note that the following alternative documentation has been proposed and approved:

1) Site plans of the precinct illustrating;
• The current As Built stormwater reticulation, and attenuation facilities, and
• Construction plans for the stormwater reticulation of the registered project
Water Schematic for registered project, illustrating connection to off-site non-potable water source, and usage of water source

2) A signed short report from system design consultant describing and quantifying the volume of off-site non-potable water that will be available for the registered project each day, and why.

 

Technical Clarification

Potable Water Calculator - 'intrinsic' flow controlling devices

Technical Clarification Number
WAT1-T-OB1-0112

Guidance
2010-11-09

Flow restrictors, aerators or other flow controlling devices which can only be removed from a fixture or fitting through the use of specialist equipment or tools commonly used by wet services sub-contractors or building maintenance staff, are considered an “intrinsic attribute” of the fixture or fitting. Similar devices which can be removed without the use of such tools (i.e. by hand) are not deemed intrinsic and cannot be used to claim water efficiency improvements within the Green Star SA Potable Water Calculator. For fixtures and fittings with such ‘intrinsic’ devices, product literature or manufacturer datasheets must clearly state the necessary water efficiency performance of the complete assembly with the flow controlling device for inclusion in the Green Star SA Potable Water Calculator. Water efficiency data for a fixture or fitting without such a flow controlling device that is nominally adjusted for the benefit of such flow limiting devices is not acceptable.

 

Technical Clarification

Groundwater

Technical Clarification Number
WAT1-T-OB1-0087

Guidance
2010-07-06

Previously unused groundwater seeping into building basements cannot be used in this credit as ‘non-potable’ or recycled water for amenities, unless it is used and then recycled within the building. See Technical Clarification WAT3-T-OB1-0385 under Wat-3 regarding use in irrigation.

 

Technical Clarification

Potable water calculator - non-roof area harvesting

Technical Clarification Number
WAT1-T-OB1-0083

Guidance
2010-06-14

In the potable water calculator, projects may include rainwater/stormwater harvested from surfaces other than those given in the run-off coefficient list. However, the run-off coefficient of 0.65 for 'Flat gravel or turf roof (<30 pitch)' must be used. Project teams wishing to use an alternative rainwater run-off coefficient for such surfaces may submit a Credit Interpretation Request (CIR) clearly justifying the alternative run-off coefficient.

 

Credit Interpretation Request

Approval of blackwater systems

Credit Interpretation Request Number
WAT1-C-OB1-0047

Ruling
2009-09-14

The Credit Interpretation Request (CIR) seeking approval for exempting the project from approval from the relevant authority for a blackwater treatment system is granted for this specific project at this point in time. The project must demonstrate in the submission for certification that the project team has worked with the local authority to pursue approval of the system, has designed the system to all applicable SABS, SANS and DWAF standards, and must provide assurance that the system will be installed and used once authority approval is granted. Note that any future requests from other projects for exemption from approval from the relevant authority for a blackwater treatment system will be considered on their merits on a project-by-project basis. Such projects must submit a CIR.

 

 

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