The lower part of the channel has widened and, more importantly, the steep section has moved up channel considerably. Bear in mind that this image is more than 15 hours old now. The best illustration of the way that this is developing is with this sequence of three images, which are taken about a day apart, starting on 29th May on the left and ending with 31st May on the right:
It seems to me that release of the water in the lake is now highly likely in the next few days. The most likely mode of failure looks to be this retrogressive erosion, which could lead to a rapid release event, but the initiation of erosion through downcutting cannot be ruled out. Downstream communities need to be prepared.
I have received no update on the state of flow in the channel - I will post again when some information becomes available.
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ReplyDeleteerosion seems to be rapid on the soft earth that was moved to dig the spillway and dumped at the toe of the spillway, it seems from the picture that it has very slow progress on actual debris.
ReplyDeletehttp://www.dawn.com/wps/wcm/connect/dawn-content-library/dawn/news/pakistan/provinces/04-outpour-attabad-lake-increasing-qs-06
ReplyDeleteposted about an hour ago on Dawn news' website..
The photo in Dawn looks nothing like the Attabad spillway.
ReplyDeletethe latest report i heard on 2 june was spillway will crake in few hours or days.when water is not going so fast how it is possilbe that spillway will not face this folw
ReplyDelete