Monday, May 31, 2010

Attabad - flow on the spillway continues to develop slowly

The discharge across the spillway at Attabad is still increasing.  Whilst some reports suggest that it is higher, the Pamir Timeshttp://pamirtimes.net/ suggests that the flow at 2 pm local time was 250 cubic feet per second (7.08 cubic metres per second).  If this is correct, the discharge time graph looks like this:


However, the situation is now somewhat confused as the NDMA report from 6 pm on 30th May (i.e. yesterday) was that total outflow was 900 cusecs (25 cubic metres per second).  Assuming that 250 cusecs is seepage, this would give a spillway flow of 650 cusecs (18.4 cubic metres per second).  This seems to be surprisingly high.  Maybe the NDMA information has the wrong time stamp?

Therefore, at the moment I am a little confused as to what is happening.  I will try to clarify this in the next few hours.

1 comment:

  1. have you measured the discharge into the lake from upstream? Knowing this gives you an idea of the volume of water stored behind the dam.

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