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Water Efficiency Benchmarks

Overview

Singapore's non-domestic sector uses about 55% of its current water supply and this is projected to increase to 70% of its future water demand by 2060. To manage non-domestic sector water efficiency, PUB introduced the Mandatory Water Efficiency Management Practices (MWEMP) in 2015.

Under MWEMP, large water users have to submit details of their water consumption, business activity indicators and water efficiency plans to PUB annually. With these collected data, PUB is able to develop sectorial water efficiency benchmarks for office, retail, hotel, wafer fabrication and semiconductor. 

How is WEI calculated?

The Water Efficiency Index (WEI) serves as the performance indicator for water efficiency, and refers to the amount of water used per business activity indicator.

WEI = Total amount of water consumed / Business activity indicator

Sectorial water efficiency benchmarks

The sectorial water efficiency benchmarks are tabulated based on water consumption data in 2016.

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Water Efficiency Benchmark Table

Hotel benchmarks

For the hotel sector, WEI is computed using the annual water consumption of a hotel divided by number of its occupied guestrooms in the same year. This index reflects the amount of water a hotel used for its operations per occupied room daily.

For more details, please download brochure below [PDF]. 

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Water Efficiency Benchmark Hotel

Office building benchmarks

For the office building sector, WEI is computed using a building's annual water consumption divided by its gross floor area of the building. This index reflects the amount of water used for its operations for each gross floor area annually.

For more details, please download brochure below [PDF].

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Water Efficiency Benchmark Office

Retail benchmarks

For the retail sector, WEIs are computed using:

1. annual water consumption (exclude toilets) divided by the gross floor area of a retail mall, reflecting its usage for operations per gross floor area annually.

2. annual water consumption of toilets in a retail mall divided by the number of shoppers and days in the same year, reflecting the amount of water used per shopper daily.

For more details, please download brochure below [PDF].

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Water Efficiency Benchmark Retail

School benchmarks

Based on data collected from about 300 educational institutions (primary and secondary schools, as well as junior colleges), it is found that toilets are their main water usage areas. 

For more details, please download brochure below [PDF].

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Water Efficiency Benchmark School

Wafer fabrication and semiconductor plants benchmarks

For the wafer fabrication and semiconductor plants sector, recycling rate is computed using the total recycled water of a plant divided by summation of the total supplied water and recycled water.

For more details, please download brochure below [PDF].

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Water Efficiency Benchmark Wafer Fab

Best Practice Guide in Water Efficiency

With the data and information gathered from the submission of water efficiency management plans by large water users, PUB has gathered good practices and developed a series of publications in consultation with the industry, including Best Practice Guide in Water Efficiency for Buildings, Wafer Fabrication and Semiconductor Sector, and Refineries, Petrochemicals and Chemicals Sector.  The aim of the guides is to provide professional engineers, developers, building owners, plant owners, facilities managers, facilities operators and managing agents, who are involved in water management, with basic knowledge of designing, maintaining and operating a water efficient building and plant.

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Best Practice Guide
Best Practice Guide in Water Efficiency (Buildings)
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Best Practice Guide
Best Practice Guide in Water Efficiency (Wafer Fabrication and Semiconductor Sector)
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Best Practice Guide
Best Practice Guide in Water Efficiency (Refineries, Petrochemicals and Chemicals Sector)

Best Practices on Good Cooling Tower Management

Evaporative cooling towers are an essential part of infrastructure for air-conditioning systems and many industrial processes. The water demand for evaporative cooling’s needs takes up a substantial 25% of the total water demand of large water users. In general, it is estimated that more than 30 mgd (million gallons per day) is used by such evaporative cooling towers.

To reduce water losses to the environment and instil water conservation among facilities owners, PUB has published the “Technical Reference for Water Conservation in Cooling Towers” as a technical guide for the industries and businesses. This first edition book provides best practices on good cooling tower management, operations and design for developers, building owners, managing agents, and industries. ​​