Day zero when the Cape runs dry - Page 17




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  1. #321
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    Default Re: Day zero when the Cape runs dry

    Quote Originally Posted by Prof View Post
    Quite a few of those dams are in the Southern Cape...and they border on 100%.
    That skews the situation....at the bottom the sum total of all WC dams is 35%.

    Take out the ones in Southern Cape and situation is suddenly MUCH worse.

    ...and it is immaterial if Steenbras is 100%...the overall picture is bad.
    YES, the overall picture is VERY scary !!


    I am just wondering how the Steenbras went from "empty" to full, certainly was no rain that would explain this .... or was there a proper downpour in that specific catchment area ?


    But it IS a very small dam, and makes very little difference in the bigger picture.

  2. #322
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    Default Re: Day zero when the Cape runs dry

    You can take 13 dams (the fullest ones) off the list of 43....

    Pity not in spreadsheet format.

  3. #323
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    Default Re: Day zero when the Cape runs dry

    Quote Originally Posted by Prof View Post
    You can take 13 dams (the fullest ones) off the list of 43....

    Pity not in spreadsheet format.
    Spreadsheet
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  5. #324
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    Default Re: Day zero when the Cape runs dry

    Played around...found this on Google. These are the major dams that feed Cape Town per se. Not sure why Brandvlei dam is not included.

    Click image for larger version. 

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    Taking spreadsheet and you get following situation.

    Click image for larger version. 

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    So taking out the dams that have no bearing...the situation stays the same....approx 35% water.

    Biggest problem is that the two largest dams, Voelvlei & Theewaterskloof are not receiving any substantial rain in catchment areas. The smaller ones are actually not so bad...

  6. #325
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    Default Re: Day zero when the Cape runs dry

    Quote Originally Posted by ChrisF View Post


    I am just wondering how the Steenbras went from "empty" to full, certainly was no rain that would explain this .... or was there a proper downpour in that specific catchment area ?
    Steenbras Dam (Upper and Lower) were built only for the purpose of reducing the Peak Power charge which ESCOM levied on all municipailties. If Cape Town could reduce the peak power draw, usually during breakfast time or supper time, the city could make such a big saving that it paid to build the scheme. This makes sense: Escom had to build enough power stations to cater for the peak demand, after all.

    This means that the Steenbras Dam, and the Palmiet Dam, are managed by the Electrical Department, who are not concerned with water storage. If city power demand is low, they pump water up the hill and fill Steenbras. If they see a bit of a peak on their meters, they open the valves and let it all run down the hill to generate power.

    It is therefore pointless to monitor the level of Steenbras Dam.

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