Abantika Ghosh | TNN New Delhi: Exactly two decades ago, the apology of a river that flows through Delhi had inundated it, leaving 20 people dead. Old timers recall how the top of the gigantic Hanuman statue near Kashmere Gate was the only thing visible above the waters. Even as Bihar grapples with a raging Kosi, environmentalists here warn that increasing constructions in the Yamuna flood plain and the river's history of decadal floods could spell doom for the city unless Delhi learns important lessons from the Kosi disaster. The Commonwealth Games village, a transco substation and a DMRC washing yard are just some of the recent additions to the Yamuna flood plain. According to Manoj Misra of Yamuna Jiye Abhiyan, the city's recent perfunctory brush with floods were a small