Re: 40,000 Mw run of the river dam could power all Africa
From: Don Kelly (dhky_at_peeshaw.ca)
Date: 02/26/05
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Date: Sat, 26 Feb 2005 07:06:23 GMT
"habshi" <habshi@anony.net> wrote in message
news:421f58b2.29185757@news.clara.net...
>
> Rather than damming up the river entirely, the plan by South Africa's
state-owned power company,
> Eskom - which has already won over independent experts - involves creating
a "run-of-river" plant in
> which water is siphoned off, channelled through turbines and then fed back
into the river.
>
> Such plants are common in Canada, Norway and Switzerland, although their
output is much less than
> that from a dam.
------------------
Hate to tell you but taking water out at one point in the river and
returning it at another point in the river is not run of the river. Many
plants do this- some locations don't need dams. "Run of the river" simply
means that there is no reservoir capacity of any consequence and generation
is dependent on seasonal flow. Works well if there is no great seasonal
variation or there is some upstream reservoir to control flow (as in
Canadian run of the river plants- depending on outflow from a plant further
upstream)
There still must be some form of dam or control structure- sometimes only a
weir, so diversion of water can be made possible.
-- Don Kelly dhky@peeshaw.ca remove the urine to answer
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