This is a marine and geotechnical works design project commissioned by the Contractor, which was the maintenance contractor engaged by DSD, with the supervision of Port Works Division of CEDD. We carried out condition survey, bathymetric survey and seawall profile survey for the existing damaged seawall at Tai O Imhoff Tank. We assessed the existing structural condition of damaged seawall, and used the surveyed data together with the historical wave data and geological condition to design the reinstatement scheme and prepare the corresponding design submission according to the prevailing port works design standard. We also engaged with an oversea expert, who has extensive experience in design and construction of marine works, as the advisor of the project.