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LEED O+M: Existing Buildings | v2008

Cooling tower water management

WEc4.1 | Possible 1 point

Intent

To reduce potable water consumption for cooling tower equipment through effective water management and/or use of nonpotable makeup water.

Requirements

  • WE Credit 4.1 (1 point): Chemical Management
    Develop and implement a water management plan for the cooling tower that addresses chemical treatment, bleed-off, biological control and staff training as it relates to cooling tower maintenance.

    Improve water efficiency by installing and/or maintaining a conductivity meter and automatic controls to adjust the bleed rate and maintain proper concentration at all times.

  • WE Credit 4.2 (1 point): Nonpotable Water Source Use
    Use makeup water that consists of at least 50% nonpotable water, such as harvested rainwater, harvested stormwater, air-conditioner condensate, swimming pool filter backwash water, cooling tower blowdown, pass-through (once-through) cooling water, recycled treated wastewater for toilet and urinal flushing, foundation drain water, municipally reclaimed water or any other appropriate on-site water source that is not naturally occurring groundwater or surface water.

    Have a measurement program in place that verifies makeup water quantities used from nonpotable sources. Meters must be calibrated within the manufacturer’s recommended interval if the building owner, management organization or tenant owns the meter. Meters owned by third parties (e.g., utilities or governments) are exempt.

Potable water is defined as water that is suitable for drinking and is supplied from wells or municipal water systems.

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