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n Civil Engineering = Siviele Ingenieurswese - Completion of bulk upgrades for the implementation of the Lotus Canal storm-water master-plan : project management construction
Bergstan South Africa was appointed by the City of Cape Town, Transport for Cape Town (TCT) Branch, to design and implement upgrades to the Lotus Canal. These bulk upgrades form the final construction phase that would complete the requirements of the Lotus Canal storm-water master-plan. The Lotus Canal is a storm-water carrier that was constructed during the middle of last century to convey increased post-war development runoff. The canal originates in the Cape Town Airport Industria area and flows south through Gugulethu, Ottery,Grassy Park and the Zeekoevlei wetland before discharging into False Bay. The 14 km2 catchment shown in Figure 1 is the main storm-water contributor to the study area. The grades of the catchment are typically low and as a result the catchment is susceptible to flooding. The aim of the project was to design and implement a storm-water conveyance and temporal storage solution that would meet the requirements of the 50-year fully developed flow scenario for this study area and reduce the flood risk up- and downstream. The hydraulic study focused on the stretch of canal between Duinefontein Road and Vygekraal Road along with the two bodies of water south of Govan Mbeki Road and Jakes Gerwel Drive. The designers were cognisant of the environmental sensitivity of the areas due to the sites being located either side of the Edith Stevens Nature and Wetland Reserve. The 7 ha site south of Jakes Gerwel Drive had good potential to complement and contribute to the existing wetland environment, and therefore a softer engineering approach would be implemented with the aim of reintroducing wetland habitat into the area.
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