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Tuesday, February 24, 2015

Disaster of Kedarnath

Kedarnath has been one among the most religious and pilgrimage place for Hindus in India. Kedarnath temple is famous for its historical importance, association with Lord Shiva and connection with some great personalities of the past like Shankaracharya and Raja Bhoja. These personalities were believed to be behind the construction of this temple in 10th -11th century. But, in the present it has been infamous for the natural disaster of 2013 in form of cloud burst resulting to massive flood.

Kedarnath temple is made up of schist stone found locally in middle Himalayas. The temple was built over a single rock as its platform and it's a totally dry construction. Dry construction is the kind of ancient construction with absence of any binding material like mortar or cementitious material. Dry construction gains its strength through gravity in vertical direction and interlocking of building blocks in horizontal direction. The building blocks are huge Schist boulders locally available in the region and cut into specific shape and size. This prevents the vertical and horizontal movement of the building blocks. And in fact, this aspect of Kedarnath temple prevented it from flash flood carrying millions of gallons of water. At the same time, all the modern construction in the vicinity of temple was washed out. 
 
The intensity of the damage can be guessed from the above image. There was massive landslides and undercutting; infact, the Mandakini river has changed its course during and after the calamity. But Kedarnath temple survived the force of nature by luck and by use of engineering. The flood brought with itself huge volumes of water and massive boulders (some of even size of 10m x 2m x 3m). These boulders were the reason behind the annihilation of Rambara town falling into the course of river. But for the temple, one among such boulder was the savior.

First, small boulders came from top along with water, which got settled in the rear side of temple. Then, a huge boulder of size 10x2.5x3 (m3) came and bifurcated the flow of water along the sides of the temple. Also, since the temple is of dry construction with use of interlocking among building blocks at same level; the damage was minimized. 
Damage was there mainly into projections spreading out from main structure like few columns of the Mandapa (middle portion of temple). Few of the building blocks were broken or missing from the corner of the temple, which can be repaired with locally available stones stitched to remaining one. 

Above figure demonstrates the damaged column of the temple, which for temporarily supported with stone bricks available locally. The only concern regarding the temple is its foundation where water gets deposited after the flood. The exact location of water has to be found in order to pump out; but the concerned technology is not available in India. And the only solution of digging is not there in the list because of sanctity of the area as fixed the so called religious guards. And it's very difficult to make them understand the engineering. The existence and durability of this great Kedarnath temple structure depends on this, which will be decided by time only.

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