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This story is from July 8, 2007
'Road craters due to bad workmanship'
What's common between the moon and the roads of Ahmedabad? Both are endowed with craters. Come rains and the city roads look like the Grand Canyon.
While civic authorities call it the inevitability of urban development, experts say it indicates "poor workmanship" which can be dangerous during an earthquake.
In the past month, cave-ins on roads across the city resulting in dangerous craters (bhuva) are a common sight.
"Craters become common on resurfaced roads," says L M Patel, former joint director of technical education in
the government of Gujarat and the chief civil engineer in the construction of CG Road.
"If during resurfacing, layering and compacting is not done as per technical specifications, it leaves spaces in between. When it rains, the material tries to 'reorient' and compacts in these spaces. This results in the top level of the road 'sitting down'," he adds.
However, AMC officials disagree with Patel. Craters, they say, happen due to corroded drainage pipelines beneath the road surface due to the continuous passage of sewage gases like hydrogen sulphide and methane.
"Corrosion leads to seepage of water from the pipes that rises upwards. As it recedes, it pulls the soil down resulting in a cave-in," a senior engineer explained. Ahmedabad's sandy soil, which does not support good binding of soil particles, is also a culprit, says the AMC.
But not many buy the theory. Dean of the Physical Research Laboratory, Ashok Singhvi says cave-ins happen due to bad workmanship.
B K Rastogi, director-general of the Institute of Seismological Research in Gandhinagar says such roads can increase the chances of damage during earthquakes. "Cracks can develop faster on such roads," he said.
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