Quoted: Both South Korean companies mentioned heavy rains in their descriptions of the disaster. But Ian Baird, a geography professor at the University of Wisconsin, Madison, who specializes in Laos and has studied the hydropower project, said he believed the problem was either faulty construction, or a decision to store too much water in the dam’s reservoir at a time when heavy rain should have been expected. “When at the end of July do we not get rain in this part of the world?” he asked.