A team of geologists observed that a large amount of debris and water came and accumulated in the stream (Tel gaad) at its point of confluence with the Bhagirathi River and formed a large fan-shaped deposit (alluvial fan) of sediments. This fan with saturated sediments obstructed the original channel of the Bhagirathi River and formed a temporary lake on the right bank of the river. The high moisture content in fan area prevented use of heavy machinery.
