Wong Nai Chung Reservoir is the third oldest surviving waterworks construction in Hong Kong. Upon its completion in 1899, it served as a supplementary source to the Tai Tam Group of Reservoirs and further expanded the facilities for storing water on Hong Kong Island. The surviving historical structures at Wong Nai Chung Reservoir include a masonry dam, a valve house and a weir.
3 Historic Structures of Wong Nai Chung Reservoir were declared monuments in 2009.
Reference :
For more details concerning the historic waterworks facilities, please refer to the following website
Water Supplies Department