Computational Hydraulics Aspects of the Drainage System Planning for Happy Valley Flood Protection Scheme, Hong Kong K.W. Mak*, Jimmy Poon**, Kelvin Lau***, Eric Lo****, Kevin Chan***** * Assistant Director, Drainage Services Department, the Government of the Hong Kong Special Administrative Region (E-mail:
[email protected]) **Senior Engineer, Drainage Services Department, the Government of the Hong Kong Special Administrative Region (E-mail:
[email protected]) ** Associate Vice President & Project Director, Black & Veatch, 25/F, Millennium City 6, 392 Kwun Tong Road, Kowloon, Hong Kong (E-mail:
[email protected]) **** Technical Director, Black & Veatch, 25/F, Millennium City 6, 392 Kwun Tong Road, Kowloon, Hong Kong (E-mail:
[email protected]) ***** Engineer, Black & Veatch, 25/F, Millennium City 6, 392 Kwun Tong Road, Kowloon, Hong Kong (Email:
[email protected]) Abstract: Happy Valley is a low-lying urban area located in the hinterland of the Wan Chai District and is surrounded by a hilly terrain. Serious flooding occurred in the Happy Valley catchment, in particular the Happy Valley Recreation Ground (HVRG), Hong Kong Jockey Club (HKJC) racecourse and nearby streets, during heavy rainstorms in 2000, 2006 and 2008. To address the flooding problem, the Drainage Services Department of the Government of the Hong Kong Special Administrative Region proposed a Happy Valley Underground Stormwater Storage Scheme (HVUSSS) project at the HVRG. The project would raise the flood protection level of the drainage system in Happy Valley to cater for rainstorms with a return period of 1 in 50 years, and in turn significantly reduce the risk of flooding in Happy Valley and areas in the vicinity.