Merlin WDP

The aim of BREEAM WAT 02 is to ensure water consumption can be monitored and managed and therefore encourage reductions in water consumption.

To demonstrate compliance with BREEAM WAT 02 requirements:

A water meter is to be supplied to the mains water supply to each building. The water meter should have a pulsed output so the information can be monitored through a BMS (Building Management System.)

For one credit –

• Sub meters are to be fitted to allow the metering of individual water consuming plant or building areas, where demand in such areas will be equal to or greater than 10% of the total water demand of the building.
• Each sub meter has a pulsed output to enable connection to a BMS for the monitoring of water consumption

• Sub meters are to be fitted to allow the metering of individual water consuming plant or building areas, where demand in such areas will be equal to or greater than 10% of the total water demand of the building.
• Each sub meter has a pulsed output to enable connection to a BMS for the monitoring of water consumption

BREEAM (BRE Environmental Assessment Method) is the leading and most widely used environmental assessment method for buildings.

BREEAM WAT 03 offers two credits in total both based around major water leak detection & water leak prevention.

A leak detection system which is capable of detecting a major water leak on the mains water supply within the building and between the building and the utilities water meter.

The leak detection system must have the following features:

• Audible when activated
• Activated when the flow of water passing through the water meter/data logger is at a flow rate above a pre-set maximum for a pre-set period of time
• Able to identify different flow and therefore leakage rates, e.g. continuous, high and/or low level, over set time periods
• The leak detection system must have the following features:
• Programmable to suit the owner/occupiers’ water consumption criteria
• Where applicable, designed to avoid false alarms caused by normal operation of large water consuming plant such as chillers.

Please note – Where it can be demonstrated that it is not physically possible for a meter to be installed on the pipework, the requirement for leak detection between the building and the utilities meter can be considered not applicable, and the credit awarded based on the leak detection within the building.

So long as the compliant system alerts the appropriate person to the leak so they are able to respond immediately, the assessor can judge if the aim of the issue is being met by a reliable, robust and fail-safe means of notification.

For the second credit –

One of the following types of flow control device is fitted to each WC area/facility to ensure water is supplied only when needed

1. A time controller i.e. an automatic time switch device to switch off the water supply after a predetermined interval
2. A volume controller i.e. an automatic control device to turn off the water supply once the maximum pre-set volume is reached.
3. A presence detector and controller i.e. an automatic device detecting occupancy or movement in an area to switch water on and turn it off when the presence is removed.
4. A central control unit i.e. a dedicated computer- based control unit for an overall managed water control system, utilising some or all of the types of control elements listed above.

Please note – The criteria are applicable to the cold water supply only and include cold taps, WCs and urinals. Any solution implemented to achieve compliance with this Issue should effectively mitigate the risk of hot-water scalding in showers, in the event that the cold water supply is shut off.

A shut-off on the cold water supply to the whole WC facility provides a simple and effective way of reducing potential water loss. Taps which contain built in shut-off valves will not prevent any water leaks from the supply to the tap and so do not fulfill this intent.