Touhcing Heart
FUN-2-START
NOKIA X
Thursday 3 April 2014
Sunday 30 March 2014
ATTABAD
LANDSLIDE DAM LAKE
SPILLWAY
DEEPENING AND CONSTRUCTION OF TRACK
1. Background
Massive landslide
occurred on 4th January 2010 near Attabad village, approximately 109
km north east of Gilgit city in the Northern Areas of Pakistan. The slide
caused heavy loss to life and property. The landslide, having volume over 50
million cubic meters (1.80 billion cubic feet), created a landslide dam, about
120 meters high at the lowest point and about 2 km long along the river, which
completely blocked River Hunza resulting in formation of a lake on the upstream
side and inundation of over 19 km of KKH which inundated villages in the area
and completely halted all kind of vehicular traffic.
Within
days of catastrophe a team of experts from the Engineer-in-Chief’s Branch GHQ,
FWO and NESPAK visited the site in order to consider various options to clear
the blockage. It was mutually agreed that construction of an open cut spillway
on top of the landslide mass was technically viable which would immediately
lower the hazard. Accordingly, FWO was mobilized at the site on 22nd
January 2010 to execute the work. Despite various hardships, FWO completed a
415.0 m long, 60.0.m wide and 24.0 m deep
spillway cut by 13th May 2010. Going beyond 24 m depth was not
possible at that time due to caving-in of side slopes of the spillway cut that
could have damaged the efforts already undertaken.
Water
started flowing through the spillway cut on 29th May 2010. Initially, the
increase in water outflow through the spillway cut eroded the sides and bottom
of the spillway cut on the downstream side and erosion progressed retrogressively
backward towards the mouth of spillway cut. However, further deepening and
widening at the mouth of the spillway did not take place due to presence of
large rock blocks.
This
situation was reviewed by a technical committee formed on the orders of the President
of Pakistan which recommended that work on further deepening of spillway should
continue using controlled blasting in order to break the large rock boulders. These
recommendations were discussed in a high level meeting under the
co-chairmanship of the President and Prime Minister of Pakistan held on 21st
July, 2010 and then in a subsequent meeting on 22nd July, 2010
chaired by the Prime Minister. It was decided to designate Lt. Gen (Retd.)
Shahid Niaz, Member (I&M), Planning Commission as the coordinator to
supervise all aspects pertaining to the technical interventions aimed at
lowering down the water level in the lake. All other organizations were to
provide required assistance and technical support in this regard.
Chinese
and American experts having experience in handling natural calamities and
hazards visited the site and submitted the following proposals:-
(a)
The Chinese proposal recommended the use of Trench Mortar to
deepen the spillway cut by 30 meters at an estimated cost of US$ 28 million
(Rs2.4 billion) and restoration / realignment of KKH at US$ 250-300 million (Rs
21-25 billion).
(b)
The American proposal recommended construction of tunnel for lake
taping and simultaneously deepening of spillway. The estimated cost of the
proposal was over US$ 50 million (Rs 4.45 billion) to be completed in more than
three years.
(c)
Besides the aforesaid proposals, FWO also came up with their
proposal to handle this issue through controlled blasting and mechanical
excavation. The tentative cost of FWO proposal will be Rs. 580 million within
the period of eight months.
Comparing
all the three proposals received in this regard, the FWO proposal was
considered more appropriate being economical and practical. In order to meet
the financial requirements of the project, the CDWP in its meeting held on 21st
January 2011 approved the project titled “Lowering of Water in Attabad
Landslide Dam” at a cost of Rs.662.50 million
2. Methodology of Spillway Deepening
Keeping in view the experience of first 24m deep cut of landslide
mass (Phase-1 of the assignment) FWO proposed revised methodology for further
deepening of spillway cut by 30 meters in Phase-II of the assignment by
constructing series of coffer dams. The main theme was to retain the lake water
level while lowering the downstream area of landslide using drill and blast
technique to break large rock blocks. FWO planned to reach the desired
excavation level of El. 2368 by constructing five (05) coffer dams, each of 12m
height. Locations, proposed levels and schematic sketches of these proposed
coffer dams are shown in Figure 1. Four of the five proposed cofferdams have
been completed and blasted. The spillway bed and lake levels are given in Table
1.
Attabad Landslide Lake
As per orders of the Prime Minister of Pakistan, the work
regarding Lowering of Water Level in Attabad Landslide Lake was awarded to FWO
with NESPAK as Consultant. Accordingly CDWP approved the project “Lowering of
Water Level in Attabad Landslide Lake on 21-01-2011 at a cost of Rs. 662.5
million for a period of one year up-till November, 2011. The project could not
be completed in the prescribed time due to a number of difficulties specific to
that area i.e. extreme weather conditions, high flow of water in the river and
lack of repair and maintenance facilities etc. Therefore, with the approval of
Secretary the project was extended up-till June, 2013. Later on, due to
increase in the scope of the work, the project was revised with the approval of
CDWP at an enhanced cost Rs. 995 million at time extension up-till June, 2014,
As per revised PC-I, the contract with FWO has been extended up-till June,
2014, whereas the case for extension to the consultancy contract of NESPAK is under
consideration in the Ministry of Planning, Development & Reform since
February, 2013.
Monday 17 September 2012
Never Look Back
Last Meeting with Dhoni's Eleven in Asia Cup, That Time Luck is not in favour of Pakistan. But Today the Day is Shining and Also Professor's Eleven make an other glorious historical day in Pakistan's Cricket.
Losing Toss Every One is sure that India will win today's wormup match and according to expectation they set a huge total of 185 runs.
In Replay Elder Akmal's Magic did work and shutting 92 runs of 50 balls makes every thing possible.
Losing Toss Every One is sure that India will win today's wormup match and according to expectation they set a huge total of 185 runs.
In Replay Elder Akmal's Magic did work and shutting 92 runs of 50 balls makes every thing possible.
Tuesday 28 February 2012
Lahore Visit
2007's Winter Proves More Event full for us, Our Visit to Lahore was the most memorable tour in our life, We visited Historical Places in Lahore, Particularly Ananr Kali Bazar, Qilla Lahore, Minar-e-Pakistan, Badshai Mosque, Shahlimar Garden and also Lahore famous Food Street,
Mr. Muhammad Sadiq (Late) |
Lahore Visit
This Winter Proves More Event full for us, Our Visit to Lahore is the most memorable tour in our life, We visited Historical Places in Lahore, Particularly Ananr Kali Bazar, Qilla Lahore, Minar-e-Pakistan, Badshai Mosque, Shahlimar Garden and also Lahore famous Food Street,
Mr. Muhammad Sadiq (Late) |
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