|Date:||8 November 2018 (Thursday)|
|Dress code:||Participants are suggested to bring and put on their own personal protection equipment (Helmet, Safety Vest and safety shoes).|
Locations: (either one of the following)
Stanley Sewage Treatment Works (Stanley STW), constructed from November 1990 to February 1995, is a secondary treatment works built in caverns. With a design treatment capacity of 11,600m3 per day, it serves a population of over 27,000 in the nearby areas. Stanley STW was designed and constructed to preserve the natural environment of the area. The STW was built inside three large caverns, each about 120m long, 15m wide and 17m high, together with over 450m of road access, ventilation tunnels and shafts. Not only visually unobtrusive, the underground works also spared the neighbourhood from unpleasant environmental impact both during construction and its daily operation. The STW is the first of its kind in Southeast Asia.
Happy Valley Underground Stormwater Storage Scheme (HVUSSS) comprises an underground stormwater storage tank of 60,000m3 capacity to attenuate the peak stormwater flow through temporary flood storage, thereby allowing the existing downstream drainage system to cope with severe rainfall of 1-in-50 year return period.
Innovative and sustainable features have been widely adopted in this project. The major features include an automatic movable weir being installed between the storage tank and box culvert to control the inflow of stormwater into the tank during heavy rainstorms; a water harvesting system to collect groundwater, rainwater and irrigation water for reuse of non-portable water; and sustainable green features to integrate the drainage infrastructure into the Happy Valley Recreation Ground.
Po Shan Drainage Tunnel
The Mid-levels area in the vicinity of the Po Shan hillside is underlain by thick bouldery colluvium which is susceptible to landslide due to the development of high groundwater level. A number of significant historical landslides have occurred in the area including the 1972 tragic Po Shan Road landslide which caused 67 fatalities. The Geotechnical Engineering Office of the Civil Engineering and Development Department implemented an innovative regional groundwater regulation system comprising a pair of drainage tunnels with a network of 172 sub-vertical drains to control the groundwater levels in the Po Shan hillside, so as to reduce the risk of landslides and enhance public safety.
HKU Saltwater Service Reservoir
As part of the Hong Kong University's Centennial Campus development project, two existing salt water service reservoirs (i.e.Western Salt Water Service Reservoirs) were re-provisioned in the rock cavern in 2009 to release land for the development. The total storage capacities of the two reservoirs are 12,000 cu.m. This has optimised land use and avoided substantial cutting of the hillside, thereby reducing the amount of spoil requiring disposal and minimising the disturbance to the natural habitat as well as the visual impact on the neighbourhood. The salt water service reservoirs are meeting the needs of about 120 000 people in the Central and Western areas of the Hong Kong Island.
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