Sustainability Report

Water Resources Management

DSD has incorporated concepts of sustainable water resources management into our newly constructed facilities to improve the utilisation rates of water resources. Major design elements include rainwater harvesting systems, underground stormwater storage systems, rain gardens and porous pavements, etc. Between 2012 and 2016, associated projects completed included the Kowloon City No. 1 and No. 2 Sewage Pumping Stations, Lai Chi Kok Drainage Tunnel, and Happy Valley Underground Stormwater Storage Scheme (HVUSSS).

For instance, the water harvesting system in the HVUSSS collects groundwater, rainwater and irrigation water from sports pitches which is then treated and reused for irrigation at 11 football pitches and toilet flushing to save scarce water resources.

Water Harvesting System of HVUSSS

Both Kowloon City No. 1 and No. 2 Sewage Pumping Stations are equipped with rainwater harvesting facilities. The roofs are paved with pervious materials to support rainwater collection. Harvested rainwater is treated by sand filtration and ultraviolet (UV) disinfection for irrigation, water cascade and other non-potable uses, reducing water consumption effectively. In addition, the pumping stations are installed with the following devices to enhance the effective use of water:

• Rainfall sensors to suspend irrigation on rainy days;
• Water retention layer to enhance irrigation efficiency; and
• Water consumption monitoring system to improve water conservation.

Rainwater harvesting facilities at Kowloon City No. 1 and No. 2 Sewage Pumping Stations

Furthermore, DSD adopts various green designs, such as incorporating the concept of water resources management into rain garden landscaping design in which rainwater is filtered by garden plants and soil to improve run-off quality and reduce discharge into underground channels. Rain gardens can also beautify the environment and provide habitats to enhance biodiversity.

Water Reclamation