Silvermine River catchment

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Water chemistry map centred on the Silvermine River

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Water microbial map centred on the Silvermine River

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The City of Cape Town has an Open Data Policy whereby these inland water quality sample result datasets are made available on their website:
  1. Escherichia coli (E.coli) as raw data and in a report sent to the Water and Sanitation Portfolio Committee - e.g. the September 2022 E. coli report).
  2. Chlorophyll a, Microcystin toxins, Ammonia, Unionised Ammonia, Chemical Oxygen Demand (COD), Conductivity, Dissolved Oxygen, Sum of Nitrate and Nitrite, Ortho-phosphate, Oxygen Saturation, pH, Suspended Solids and Temperature data.
  3. The inland water quality sample point positions.
See the City of Cape Town website for further details, for example these Frequently Asked Questions.
The computer program that generates the maps above processes the tables of results to make them more accessible.
The colour-coding arbitrarily groups water into three vaguely-named classes, allowing you to quickly home into areas of interest. Click on a site to see a box with short summary of the status, then click in the box to see the individual sample results plotted against time.
Note that these results are made available so that you can better understand the ambient quality of Cape Town's inland waters. The vague names of the classes are deliberate, because more information about a water body would be needed for a true assessment.
A river or lake is dynamic and ever-changing, so these results tell you things about the water at distinct moments in the past, and do not necessarily explain what the water is like today, and certainly not what it will be like tomorrow.
The City of Cape Town does not warrant or guarantee the quality or accuracy of the data accessed, extracted or used from their site.