FWIW, I would suggest drawing down the downstream dam to
the flow from this naturally made lake. The natural lake is definitely
going to fail soon – random soil compaction, soil voids, no actual
analysis on capacity…. What they are doing to start creating a way
to let the water out is a good way to go. When they build dams, they
create the temporary side channels. Maybe they could take that
The dam downstream would have been designed probably on the 50-yr data,
discharge capacity, reserve capacity, and the volume they want to keep
lake would be considered. Maybe the government could tell the Taliban
that there are a bunch of infidels living there and they could send
suicide bombers to open up the waterway and finally be useful to the
Glenn C. Otto, P.E.
A Structural Engineer, P.C.
Virginia Beach, VA
"Contemplate the mangled bodies of your countrymen, and
then say 'what should be the reward of such sacrifices?' ... If ye love
better than liberty, the tranquility of servitude than the animated
freedom, go from us in peace. We ask not your counsels or arms. Crouch
lick the hands which feed you. May your chains sit lightly upon you,
posterity forget that you were our countrymen!"
The bridges and other riverine structures in Pakistan are designed
on 50 year rainfall data. A free-board of 4ft is mandated on major
bursting of this dam will cause major damage to roads and bridges (as
villages and towns) downstream of this dam.
The item of major concern is the huge Tarbela Dam about 400 miles
This is one of the largest earth-filled dams in the world. If the
capacity of the dam is exceeded by this flood, it could lead to
a catastrophe of major proportions. However I believe that the huge
reserve capacity of this dam can absorb even unusual floods unless they
in the peak glacier melting and rain season when it is quite full
This issue is perhaps more for a water engineer than us structurals,
someone has an insight into this, sharing it may be very helpful. TIA
Syed A Masroor
Subject: Lake due to landslide in Hunza, Pakistan
Date: Thu, 10 Jun 2010 14:11:03 +0500
months ago, on January 4th, 2010 in the remote Hunza River Valley of
Pakistan, a massive landslide buried the village of Attabad, destroying
homes, killing 20 people, and damming up the Hunza River.
lake is now over 300 feet deep and had a storage of 2MAF and a bigger
than the landslide itself.
Spillway made in the lake is discharging at close to 5000 cusecs which
to the inflow and thus level of water is not falling.
share any previous experiences/solutions to such type of catastrophe.