The Yamuna crossed the danger mark of 205.33 metres in Delhi on Monday as torrential rains pummelled the upper catchment areas of the river for the third day on the trot.
The river breached the danger mark earlier than expected. It was predicted that it would cross the danger mark by Tuesday afternoon.
According to the Central Water Commission's (CWC) flood-monitoring portal, the water level at the Old Railway Bridge had risen to 205.4 metres by 5 pm as Haryana released more water into the river from the Hathnikund barrage in Yamunanagar.
The water level is anticipated to rise to 206.65 metres on Tuesday before it starts receding.
Addressing a press conference, Chief Minister Arvind Kejriwal said a flood-like situation is unlikely in Delhi, but the government is prepared to tackle any eventuality.
He said the evacuation of people from low-lying areas will start once the river breaches the 206-metre mark.
The irrigation and flood control department said the flow rate at the Hathnikund barrage gradually increased to 3,05,768 cusecs at 5 am on Monday. It had dropped to 1,90,837 cusecs at 1 am.
Normally, the flow rate at the barrage is 352 cusecs, but heavy rainfall in the catchment areas increases the discharge. One cusec is equivalent to 28.32 litres per second.
The water from the barrage takes around two to three days to reach Delhi.
The Delhi government issued a flood warning on Sunday and is creating awareness among people living close to the river banks.
Authorities have been instructed to stay vigilant and take necessary action in vulnerable areas. Quick response teams and boats have also been deployed.
The Delhi government has set up 16 control rooms, including a central control room, to monitor the flood-prone areas and the water level of the Yamuna.
Northwest India has seen incessant rainfall over the last three days, with many areas in Jammu and Kashmir, Uttarakhand, Himachal Pradesh, Haryana, Uttar Pradesh and Rajasthan recording "heavy to extremely heavy" precipitation.
This has resulted in overflowing rivers, creeks and drains that have massively damaged infrastructure and disrupted essential services in Jammu and Kashmir, Himachal Pradesh, Uttarakhand and Punjab.
Delhi witnessed its highest rainfall (153 mm) in a single day in July since 1982 in the 24-hour period ending at 8:30 am on Sunday. The city received an additional 107 mm rainfall in the subsequent 24 hours, exacerbating the situation.
The heavy rain transformed roads into gushing streams, parks into watery labyrinths and marketplaces into submerged realms.
In response to the torrential rain, the Delhi government announced a closure of all schools on Monday and cancelled the Sunday leave of government officials, instructing them to be in the field.
The Yamuna river system's catchment covers parts of Uttar Pradesh, Uttarakhand, Himachal Pradesh, Haryana, Rajasthan, Madhya Pradesh and Delhi.
The low-lying areas near the river in Delhi are considered prone to flooding and are inhabited by around 41,000 people.
Encroachments on the river floodplain have occurred over the years, despite the land belonging to the Delhi Development Authority (DDA), revenue department and private individuals.
The Yamuna breached the danger mark twice in September last year, with the water level reaching 206.38 metres.
In 2019, the river witnessed a peak flow rate of 8.28 lakh cusecs on August 18-19 and the water level rose to 206.6 metres. In 2013, it reached a level of 207.32 metres.
The river had swollen to an all-time record water level of 207.49 metres in 1978.
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