Cape Town Harbour experts?





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  1. #1
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    Default Cape Town Harbour experts?

    What is this breakwater doing there? I assume it is protecting something, but what?
    Big picture from Google Maps and detail pic from the COCT GIS viewer.
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  3. #2
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    Default Re: Cape Town Harbour experts?

    I'm intrigued.
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    Default Re: Cape Town Harbour experts?

    Street view.
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    Default Re: Cape Town Harbour experts?

    I'm not an expert but think it has to do with sand management.
    I know the whole bay has one, with he development in Houtbay and the stabalising of the dunes, less sand is added on the Llundudno side leading to the beach being stripped. The other problem is then the lack of sand being deposited on the Milnerton side, affecting things like Woodbridge Island.

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    Default Re: Cape Town Harbour experts?

    What is that circled in the picture below?

    Gauteng pumps it's waste into the Vaal river, maybe that is Cape Town's solution and they need to prevent some form of erosion in the process. Click image for larger version. 

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    Last edited by Tom13; 2020/08/04 at 10:55 AM.
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    Default Re: Cape Town Harbour experts?

    Quote Originally Posted by Tom13 View Post
    What is that circled in the picture below?

    Gauteng pumps it's waste into the Vaal river, maybe that is Cape Town's solution and they need to prevent some form of erosion in the process. Click image for larger version. 

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    Yes to prevent that thing in the circle to silt up
    Last edited by JLK; 2020/08/04 at 11:03 AM.
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    Default Re: Cape Town Harbour experts?

    Quote Originally Posted by Tom13 View Post
    What is that circled in the picture below?

    Gauteng pumps it's waste into the Vaal river, maybe that is Cape Town's solution and they need to prevent some form of erosion in the process.
    Cape Town has been pumping raw sewage to sea for decades. The pipe outlet is off Mouille Point some distance out to sea near the seabed. Many photos are available of the discharge on the internet with divers in the picture.
    Last edited by Olyfboer; 2020/08/04 at 11:12 AM. Reason: Spelling

  10. #8
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    Default Re: Cape Town Harbour experts?

    Its standard practice for nearly all coastal cities they apparently filter the worst out then its straight into the sea

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    Default Re: Cape Town Harbour experts?

    Quote Originally Posted by JLK View Post
    Yes to prevent that thing in the circle to silt up

    Yes, "that thing" is what I'm after. It isn't the primary waste line, as that pipe runs into the sea. But it could be related to waste processing?

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    Default Re: Cape Town Harbour experts?

    Quote Originally Posted by dph View Post
    Yes, "that thing" is what I'm after. It isn't the primary waste line, as that pipe runs into the sea. But it could be related to waste processing?
    It could also be to keep the wave action out, for some or other reason?
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    Default Re: Cape Town Harbour experts?

    It's either the inflow or outflow from the old Paarden Eiland power station that was a few hundred meters from there.

    I used to work in the building just past it when it was still the Court Helicopters Docks Base.
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    Default Re: Cape Town Harbour experts?

    Is the item in the circle not one of the desalination plants erected when CT had the severe drought?

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    Default Re: Cape Town Harbour experts?

    Quote Originally Posted by PaulWW View Post
    Is the item in the circle not one of the desalination plants erected when CT had the severe drought?
    A desalination plant that size would supply around 20 kl a day.

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    Default Re: Cape Town Harbour experts?

    Quote Originally Posted by JohnnoK View Post
    It's either the inflow or outflow from the old Paarden Eiland power station that was a few hundred meters from there.

    I used to work in the building just past it when it was still the Court Helicopters Docks Base.
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  18. #15
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    Default Re: Cape Town Harbour experts?

    Thanks Johhno. The OP didn't give an indication where exactly that was. I was under the impression it was near Granger bay due to the orientation of the inlet assuming the top of the pic was north.

    Because the old Salt River power station had no cooling towers, it looked like the building on the Pink Floyd "Animals" album. Cape Town municipality used to produce it's own electricity those days with Salt River, Table Bay and Athlone power stations. Bet they wish they had kept them instead of going the Eskom route.

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    Default Re: Cape Town Harbour experts?

    Battersea power station, quite a landmark on the Thames......currently being converted into a very cool mixed use urban area
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  21. #17
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    Default Re: Cape Town Harbour experts?

    Quote Originally Posted by PaulWW View Post
    Is the item in the circle not one of the desalination plants erected when CT had the severe drought?
    No, I worked there back in the early 90s and it was there then.
    It may be repurposed as part of the desal, but it wasn't originally that.
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    Default Re: Cape Town Harbour experts?

    Quote Originally Posted by Olyfboer View Post
    Thanks Johhno. The OP didn't give an indication where exactly that was. I was under the impression it was near Granger bay due to the orientation of the inlet assuming the top of the pic was north.

    Because the old Salt River power station had no cooling towers, it looked like the building on the Pink Floyd "Animals" album. Cape Town municipality used to produce it's own electricity those days with Salt River, Table Bay and Athlone power stations. Bet they wish they had kept them instead of going the Eskom route.

    Athlone was 180MW. 6 x 30 MW sets. Useful but small. The others, even smaller. Koeberg is I think 1000MW

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    Default Re: Cape Town Harbour experts?

    Thanks Fanner. But Athlone, Table bay and Salt River only had to supply Cape Town. Koeberg was far from Cape Town when it was built and supplies the national grid. My town has seven Lister - Blackstone (Now Mirlees) diesel generators that used to supply power to the town until Eskom started supplying the town in 1983.

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    Default Re: Cape Town Harbour experts?

    Quote Originally Posted by JohnnoK View Post
    It's either the inflow or outflow from the old Paarden Eiland power station that was a few hundred meters from there.

    I used to work in the building just past it when it was still the Court Helicopters Docks Base.
    Exactly that. Also if I remember correctly the Blue store, that dilapidated blue building in the one photo, also used that canal for a cooling outlet. Not sure what they use the building for now but in the '90s most refrigerator containers relied on huge cooling plants to refrigerate the containers. That store was made up with the same layout as the interior of a container ship. The containers were brought in and plugged into the central supply of cool air through round holes top and bottom on one end. It was a huge challenge keeping the store consistent especially when it was onion season. They would arrive hot from the farm and rely on the port to cool them. Because of this the containers moved to the modern clip on where each container has it's own built-in refrigerator and you only need to plug this into a power supply. So from Farm to the customer, it was easier to keep the cold chain.

    The breakwater is to stop surging as the natural current there gives a natural pull on the outlet. I was an engineer with Portnet in the early '90s. I ran the Ben Schoeman workshop for awhile my civil engineering buddies had the interesting task of monitoring the sand flow. The interesting thing is at this time around 1992 they began to realise the effect Ben Schoeman was having on the sand in the area. It had been built in the 1970s. There is huge silt build-up stretching north from the Ben Schoeman Breakwater. This has impacted the Sand cycle. The Sewer outlet is a little further north though nowadays it just flows out the Milnerton lagoon.

    The Sand cycle mentioned in another post is a huge cycle of Sand that starts with the Sand being blown across the Cape Flats in winter into the sea. It then circulated around the point into Hout Bay over the neck to Sandy bay and progressively up the coast to Table view and then across the flats. This is what the Atlantic beaches would decline in winter and grow in Summer. The development of Tableview and Parklands as well as Hout Bay hs damaged this cycle. Not having lived in Cape Town since 1996 I don't know by how much.

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