Thursday, July 22, 2010
Update on Channel Geometry at Attabad
The Pamir Times published a new, but lower resolution photo, of the spillway at Attabad a few days ago. There has been substantial erosion of the channel in the downstream portions, but it is difficult to tell whether or not the upstream choke point has changed as much. The lake level has been rising in response to the summer runoff season, but has plummeted the past few days. The reasons are not clear; details and speculations here. Yesterday, Dave's landslide blog reported that officials in Pakistan have decided to blast the spillway to lower the lake level several 80 meters in order to try to restore the Karakoram highway to China that has been drowned out by the blockade lake. This is clearly a major, and potentially hazardous, engineering task.