Hanoi - Engineers have discovered two new cracks in the body of a 130-metre-high dam under construction in the province of Son La, Vietnamese media reported Wednesday.
The newspaper Thanh Nien (Youth) reported the cracks were in addition to another one discovered in September 2008. The largest is 31.5 metres long and 1 millimetre wide, and runs 6 metres deep into the body of the dam.
The paper reported Nguyen Kim Toi, director of the construction project, said the cracks could be due to shrinkage following temperature changes when the concrete encountered rain.