Rainfall

Post Monsoon 2020: State wise Rainfall

According to India Meteorological Department (IMD), during the just concluded Post Monsoon Rainfall for 2020, that included rainfall during Oct-Dec months, India received 124.6 mm rainfall, 0.64% above the normal rainfall of 123.8 mm during the period. As per IMD[i] definition, the rainfall was thus normal.

This three-month period from Oct 1, to Dec 31 includes the North East Monsoon that mainly affects parts of South India including Tamil Nadu, Puducherry, Rayalseema, parts of Karnataka and Kerala. IMD declared on Jan 1, 2021 that the of NE Monsoon ended on Dec 31, 2020 with normal overall rainfall: TN had 6% above normal, Karnatak 13% above normal, Puducherry 32% above normal, Andhra Pradesh 33% above normal. However, Lakshadweep had 9% below normal and Kerala 26% below normal. This monsoon provides 48% of the annual rainfall of TN so it is most imp for that state.

The rainfall revived only towards the end of November, mainly due to two consecutive cyclones — Nivar and Burevi — both of which developed in the Bay of Bengal. While Cyclone Nivar crossed the coast close to Karaikal near Puducherry and brought heavy showers for the east and coastal districts of Tamil Nadu, Cyclone Burevi weakened before it reached land.

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Rivers · Sand Mining

West Zone River Sand Mining Dialogue: Mining Riparian Health

River Sand Mining is equivalent to mining not only riparian health, but also destroying massive water storage and recharge capacity. This was one of the central message of the West Zone River Sand Mining Dialogue on Nov 12, 2020 (4-6.30 pm) as part of the India Rivers Week 2020[i] theme “Is Sand Mining Killing our Rivers?” The other central message of the West Zone Dialogue was well encapsulated by this quote from Yamuna Sunny, one of the panelists at the Dialogue: “The intricate relationships between the fishers, the small scale sand miners, the sand farmers, the birds and the trees, pertains not only to possibilities of developing sustainable ways of human life in an economic sense, but also the sustaining of all life forms and their relationships in nature.”

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Delhi · Yamuna River

Sau sunar ki aur ek lohar ki – How a single decision sealed Yamuna’s fate

Guest Article by Shri Manoj Misra

Delhiites in early-mid April 2020 were pleasantly surprised to find a much healthy river Yamuna in their city. Social media was full of pictures and videos. Many had resigned not to find a living Yamuna in the city in their lifetime. But the pleasant fact was that the river in the city had indeed as if by magic come alive and presented a picture that was hard to believe. There was a river side which did not stink and looked cleaner than usual.

Continue reading “Sau sunar ki aur ek lohar ki – How a single decision sealed Yamuna’s fate”
Monsoon · Rainfall

Monsoon 2020: District Wise Rainfall

India received 957.6 mm rainfall in Just concluded South West Monsoon 2020, during the scheduled 4 month monsoon from June 1 to Sept 30, 2020. This is 8.74% above normal monsoon rainfall of 880.6 as per India Meteorological Department (IMD). This is considered ABOVE NORMAL rainfall, since rainfall is in the range 4-10% above Normal rainfall. This sounds good at national level, but the situation on ground could be very different, if we see the rainfall across the country.

It is noteworthy as per even IMD, monsoon has not yet withdrawn from most parts of the country. But IMD closes its monsoon rainfall account at 0830 hours on Sept 30, so all rainfall after that hour has to be counted in “Post Monsoon” rainfall book, even though the rainfall is very much part of monsoon as per IMD.

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Delhi · Rivers · Urban Rivers

NAJAFGARH JHEEL – SAGA OF A FORGOTTEN RIVER

Guest Article by: Ritu Rao

A short drive on the Golf Course Road in Dwarka followed by a turn towards Goyla Dairy and subsequently a sharp left just short of Goyla Dairy brings us to the famous Inspection Road /Embankment Road. Flanked by Najafgarh Drain on one side and the arable lands of Delhi on the other, the embankment road was constructed after the 1964 floods of Delhi. The thick mud embankments are covered with trees and shrubs which provide the much-needed habitat for the local flora and fauna to thrive. This thicket starts clearing off after Jhatikara crossing (say after about a half an hour drive on this road) and the Najafgarh drain suddenly transforms into a vast expanse of water known as the Najafgarh jheel. This spectacular sight continues for a good 5-6 kms before it once again narrows down into a stream. The road meets the now extinct Sahibi Nadi and Outfall from Drain No.8 at Dhansa, 5 km upstream of the jheel. The Sahibi Nadi which originates in Jaipur district and drains parts of Rajasthan, Haryana and Delhi, now has diminished flow and disappears in the arid soil near Dharuhera after the Masani Barrage in Haryana. Once fed by the Sahibi nadi and storm water runoff from the surrounding areas, the Najafgarh jheel is now fed primarily by the waste water from the Badshahpur Drain and the Outfall Drain No.8 and the rain water in monsoons.

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Indian Meteorological Department · Monsoon · Rainfall

District wise rainfall in June-Aug 2020 in India

In the ongoing South West Monsoon, India received 44 year old high surplus rainfall of 327 mm in just concluded Aug 2020, 26.6% above normal rainfall of 258.2 mm. This helped the total June-Aug 2020 rainfall to achieve 10% surplus, with actual rainfall 780.3 mm, 69.9 mm higher than normal rainfall of 710.4 mm. In June the country received 18% above normal rainfall and in July it received 9.9% below normal rainfall, the rainfall at the end of June was just 1.1 mm above normal. Thus almost the entire surplus rainfall is thanks to the rainfall during Aug 2020. The rainfall distribution has however, been far from normal that these figures suggest, as we can see from the state wise and district wise figures below.

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CWC - Central Water Commission · Dam floods · Floods

Central India downpour brings unprecedented flows in Brahmani, Chambal, Godavari, Mahanadi, Narmada, Suvarnarekha

A massive wave of flood is flowing down the rivers originating in Central India states from Odisha in East to Gujarat-Rajasthan in the west. At least fourteen river sites have seen breach of Highest Flood Levels (HFL) in last four days, a record by itself: 7 in Mahanadi, 5 in Godavari, 2 in JNarmada and one each in Suvarnarekha and Chambal. In at least four of these cases, the earlier HFL had survived for 26 years and has now been broken.

The flood wave that is traveling down is above above 35500 cumecs (12.54 lakh cusecs) in Narmada (at Indira Sagar Dam), above 25000 cumecs (8.83 lakh cusecs), in case of Mahanadi (at Hirakud Dam) and Godavari (at Gosikhurd Dam) rivers & over 15000 cumecs (5.3 lakh cusecs) in Chambal (at Gandhi Sagar Dam) River. Continue reading “Central India downpour brings unprecedented flows in Brahmani, Chambal, Godavari, Mahanadi, Narmada, Suvarnarekha”

Dam floods · Dams · Floods · Monsoon

Central India Heavy Downpour brings back nightmare memories of 2019 Chambal Scare

In a rather unusual development, no less than twenty districts in contiguous areas of Madhya Pradesh, Rajasthan and Gujarat had extremely high rainfall in the 48 hours ending at 830 am on Aug 23, 2020. Three of these districts had over 250 mm rainfall in this period, four others had between 200-250 mm, six each between 150-200 and 100-150 and one between 90-100 mm. This contiguous area broadly drains Mahi river to the West, Chambal to the North, Narmada to the South and Betwa to the East. These rivers, thus are now getting heavy flows, and will continue to get for the next few days, some of it from Chambal and Betwa will also end up in Yamuna and Ganga. It reminded one of the nightmarish memories of Sept 2019 when Gandhi Sagar Dam faced existential crisis and the flood peak downstream reached upto Farakka Dam, as CWC Flood forecasting director Sharad Chandra said in a television discussion recently. Continue reading “Central India Heavy Downpour brings back nightmare memories of 2019 Chambal Scare”

Monsoon · Rainfall

District wise Rainfall in India in June July 2020

During the just concluded first half of the South West Monsoon 2020, India received 453.3 mm rainfall, just 1.1 mm above the normal rainfall of 452.2 mm during the period. The Surplus of  18% rainfall that India received in June 2020 has thus been wiped out by the 9.9% deficit in July rainfall. Normal rainfall in July 2020 is 285.3 mm, while actual rainfall was 257.1 mm. IMD does not provide monthly figures of rainfall for different states, sub divisions and river basins, which it should along with comparison with respect to normal rainfall and rainfall last year.

To get July 2020 rainfall, we will need to use the figures given in this article along with the figures of June 2020 rainfall (see: https://sandrp.in/2020/06/30/district-wise-rainfall-in-india-in-june-2020/). The district wise figures of June-July 2020 rainfall can be seen in this PDF file from IMD: IMD DISTRICT WISE RAINFALL FROM JUNE 1 TO JULY 31 2020.

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Indian Meteorological Department · Monsoon · Rainfall

District Wise rainfall in India in June 2020

Here we present the rainfall figures from India Meteorological Department in the just concluded month of June 2020, the first month of SW Monsoon 2020. The overall rainfall at all India level in June 2020 was 196.2 mm, 18% above normal rainfall in the month at 166.9 mm. It was 33% deficit last year.

This is India’s wettest June 12 years, The Times of India reported on July 1, 2020. Agriculture Ministry Data shows that sowing is 68% higher at 31.56 m ha. The June rainfall was 202 mm in 2008, the rainfall this year is the highest since then. All four IMD regions (Northwest, Central, South, East & NE) have recorded surplus rainfall, the surplus is the highest in Central (30.5% surplus) and E-NE (15.7%) regions. North West India had the lowest surplus at 3.5%. IMD Head Mrutyunjay Mohapatra said that whole of India was covered by monsoon on June 26, 12 days ahead of the normal date of July 8.

State wise rainfall Three states had large excess rainfall (above 60% surplus rainfall), namely Bihar, Madhya Pradesh and Sikkim. Eight states/UTs (Union Territories) had excess rainfall (20-59% surplus): Assam, Meghalaya, UP, Chhattisgarh, Maharashtra, Telangana, Andhra Pradesh & Andaman and Nicobar. Nine had deficient rainfall (20-59% deficit): Lakshadweep, Mizoram, Manipur, J&K, Ladakh, Himachal Pradesh, Delhi, Dadar & Nagar Haveli. Rest of India had Normal Rainfall. Continue reading “District Wise rainfall in India in June 2020”