Works to tame two major rivers in Yuen Long have helped improve the ecology of a wetland area that has since become a hotspot for hikers, cyclists, photographers and nature lovers.
Nam Sang Wai is bordered by the Shan Pui and Kam Tin rivers which have been prone to flooding in the past.
The Drainage Services Department recently completed major drainage works in the area, such as construction of the Yuen Long Bypass Floodway, which has diverted rainwater to Kam Tin River to ease the flood risk in Yuen Long Town Centre.
Drainage Services Department Engineer Henry Yu recently told news.gov.hk: "Shan Pui River and Kam Tin River underwent major drainage works during the Yuen Long New Town Development. The works have not only improved both rivers' flood prevention capacity but also changed the area's environment and ecology."
With the rivers now efficiently discharging storm water, the department worked with environmental group Green Power to open the Nam Sang Wai River Education Trail in 2014. It features information displays showing the work done on the rivers, to enhance public awareness on conservation.
Green Power Scientific Research & Conservation Division Head Cheng Luk-ki said: "The aim of this trail is to give information to the public about the river works, the river functions and the river ecology, as well as how humans interact with the rivers."
Water course
The Nam Sang Wai River Education Trail starts on Castle Peak Road in Yuen Long. It goes around Nam Sang Wai via the Yuen Long Bypass Floodway, and a new channel of the Kam Tin River.
The trail is 5.5km long and takes two hours to walk.
Ten information panels along the route provide information on river training works and the ecological aspects of the rivers. Each panel has a QR code which visitors can scan with their smartphones to download an audio guide.
Mr Cheng said visitors can admire the Kam Tin River Basin and fishponds, which have become home to a wealth of flora and fauna.
He said green groups were once worried the drainage works would hurt the ecological habitat. However, the works have proven to be an excellent example of applying adequate mitigation measures.
The Government applied mitigation measures like mangrove replantations, which have formed a very attractive site for migratory birds, water birds and some mammals, he added.
Keeping clear
The rivers are regularly inspected.
Drainage Services Department Engineer Queenie Ip said boats are used to dredge away waste in the rivers, and drainage channels are checked to prevent silting.
"We clean up any rubbish, weeds, fallen leaves or other obstructions in the river or on the embankment. During the rainy season, after a storm or typhoon we boost our inspections and cleaning work."
She called on the public to visit Nam Sang Wai to see the beautiful environment and learn how the works have helped to preserve it for future generations.
