Delhi Floods | Yamuna Crosses Danger Marks As Water Released From Haryana's Hathinikund Barrage Yamuna in Delhi crosses danger mark. Delhi government issued a flood advisory. This comes amid all eighteen gates of Hathinikund Barrage in Haryana being opened for the first time this monsoon season. The Yamuna River in Delhi was expected to reach 206 metres by August 19, crossing the danger mark of 205.33 metres. The 'warning level' is 204.5 metres and the 'danger level' is 205.33 metres. As per Delhi government's protocol about 12,500 people are to be evacuated from the six affected districts after the Yamuna crosses the evacuation mark of 206 metres.