Water Management
Sustainable use of water resources means balancing water supply with consumption demands to ensure water resources are available and sustained in the future. According to the United Nations Environment Program, in Asia, demand for water increased over 300 percent in the last 50 years while the supply remained the same.
Since the late nineties, almost 70-80% of Hong Kong’s total water demand is supplied from Dongjiang at Guangdong and the remaining water demand is supplied by local gathering grounds (reservoirs). As the water consumption of Hong Kong is well above its local supply, this imbalance means water is being consumed unsustainably. It is ever more important for the city to practice water conservation to ensure water resources are available and sustained into the future.
Water Efficiency
Water use efficiency can be greatly increased with installation of water-saving devices recognized by the Water Efficiency Labeling Scheme (WELS) as well as water reclamation measures.
Rainwater Harvesting and Grey Water Recycling
Rainwater can be harvested from roofs of buildings and stored for non-potable uses (non-drinking purposes) such as toilet flushing and irrigation. Grey water is collected from baths, wash-basins, and kitchen sinks, treated and reused for similar purposes.
Grey water recycling system
The Grey water recycling system installed at the new Electrical and Mechanical Services Department (EMSD) Headquarters Building at Kai Tak, utilizes a membrane bio-reactor to treat greywater coming from hand washing basins, shower points and kitchen drains of the headquarters building for toilet flushing.
Please click here to access more information on Water Efficiency.
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