"The water level in the river rose to 207.12 m which is 2.29 m above the danger mark of 204.83 m. The water level is likely to go up further," a senior official of the Flood Control department said.
The highest water level of 207.49 m in Yamuna was recorded in 1978 when several areas in the city witnessed flash floods.
The city government has asked the army to be on alert for helping the civil administration, if required.
Officials said the water level is likely to go up further as Haryana released over 81,000 cusecs of water into Yamuna from the Hathnikund barrage today. The neighbouring state had released eight lakh cusecs of water on Monday and 1.5 lakh cusecs yesterday.
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They said some low-lying areas near the river, including Garhi Mandu, Usmanpur Pusta and Jagatpur village were inundated by Yamuna waters.
The authorities have set up over 400 tents in four districts, including 240 in East, 100 in Southeast, 50 in Central and 30 in Northeast to accommodate the affected people.
The 145-year-old Old Yamuna Bridge connecting east Delhi with the heart of the national capital, was shut for rail and road traffic yesterday after the water level in Yamuna rose dangerously.