Estuary Processes and Managment - River Dynamics and Integrated River Management - page 522

Fig. 8.66 Comparison of computed duckbill valve hydraulic characteristics ( d p = 305 mm, E = 7.32 MPa, t 0 = 1.57 cm)
with experimental data: (a) pressure and (b) jet velocity as function of discharge. ( d p is pipe diameter, E is total energy
head, and t 0 is rubber thicknesses)
8.5.4 Case Study: Hong Kong Harbor Area Treatment Scheme
The Harbor Area Treatment Scheme (HATS) is a major environmental infrastructure project that collects
sewage from the densely populated urban areas of Kowloon and Hong Kong Island (via a 24 km long deep
tunnel sewerage system) to a centralized sewage treatment works at Stonecutters Island (SCI) (Fig. 8.67).
Stage I of HATS has been in operation since December 2001. The sewage receives Chemically Enhanced