Lake Tewa – Modular Liner System Using GCLS

For the construction of a man made lake in 2008 at Jack’s Point in New Zealand a unique modular future proof lining system was developed using bentonite GCL as the main liner elements. The main feature of the lake lining system is that provisions were made during design and construction that allowed the further expansion of a 5 ha sized lake (currently completed) by using a modular design. A key benefit is that future expansion can occur without the need to lower the lake water level or adversely affect the recreational water quality. These were some of the requirements made by the client. The lining system was developed as there were no other options available within the project scope and budget that offered the same flexibility, innovation, future proofing and long term project security as the chosen solution. This paper provides details of the modular lake lining system. Design considerations and construction details are presented in detail and potential uses of this modular lining system shown for other uses in civil and environmental engineering.