Water Use Reduction Calculation for LEED Certification: Determining the Difference Between Baseline and On-site Water Consumption
In the pursuit of sustainability, the Leadership in Energy and Environmental Design (LEED) certification plays a crucial role. One of the key aspects of this certification is the measurement of water use reduction. Here's a breakdown of how this process works.
The baseline conditions for water use in a project are based on the minimum requirements set out by the Energy Policy Act of 1992, or local equivalents, whichever is more stringent. This baseline represents the water consumption of a typical building with standard fixtures. Conversely, the calculated installed case is based on the actual fixtures and fittings installed or specified in the project, reflecting the water-saving measures implemented.
It's important to note that the local water usage rate is not used to determine water use reduction in LEED. Instead, the water use reduction for a project is determined by comparing the baseline conditions to the calculated installed case.
Project occupancy type is a factor in calculating the baseline and installed case water consumption, but not the water use reduction itself. The water use reduction is calculated as a percentage of savings from the baseline conditions.
To calculate the water use reduction, the baseline water consumption is first determined using the LEED reference guide. The installed case water consumption is then calculated by summing up the water usage of all the installed low-flow fixtures and fittings in the project. The difference between the two figures determines the water use reduction percentage.
It's worth noting that permitted maximum water usage and the water consumption of a typical building are not factors in determining water use reduction in LEED.
By implementing water-saving strategies and selecting efficient fixtures, projects can achieve significant water use reduction and contribute to the overall sustainability goals of LEED certification. This not only aids in conservation efforts but also helps projects meet the stringent standards set by LEED.
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