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Send  Share  RSS  Twitter  20 May 2010

DEVELOPMENT: Cape Town's Focus On Stormwater Management


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Three important investigations relating to stormwater management, which take in to account the potential impacts of climate change on storm rainfall, are currently being undertaken by SRK for the City of Cape Town Municipality.

The City of Cape Town Catchment, Stormwater and Roads Department (CSRM) is spending more than R4,3-m on projects, one a pilot study that is part of an initiative to improve the asset management of the stormwater infrastructure in the city. The two other projects involve the preparation of a stormwater master plan and flood line for the Kleine Stink River, and the other the design and development of a GIS database system to provide appropriate linkages with other city asset management systems and service delivery departments. 

In each project SRK Consulting, the South African founded global group of consulting engineers and scientists, is involved. In two instances SRK Consulting is acting as part of a consortium with other consulting firms.

According to James Morris, Natal partner of SRK Consulting, the pilot study is Phase 2A of the Stormwater Infrastructure Asset Management Plan of the CSRM and incorporates a rainfall analysis and high level master planning for the Salt River catchment. The study also includes a review of the rainfall and flow monitoring systems over the whole city, the preparation of design storms for use in stormwater modelling and a high level review of the potential impacts of climate change on storm rainfall.

In parallel with the assessment of the rainfall is the preparation of stormwater master plans for the Salt River catchment,” said Morris. “This includes the development of simulation models to determine runoff from the catchments, and a study to analyse the performance of the bulk (major) storm water network (rivers, canals pipes and culverts) for a range of scenarios.

Simulations will be carried out for a range of recurrence intervals as well as simulations to model the effects of land use on water quality.  The study is characterised by large quantities of data, much of which needs to be sourced from various existing systems to be checked and updated. As this is a pilot study, the development of methodologies and systems will be used on future similar studies which will be carried out for the whole of the City of Cape Town,” he said.

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